Previous Thread
Next Thread
Print Thread
Page 1 of 3 1 2 3
Coan super sprag for street, strengths/drawbacks? #954619
03/20/11 05:08 PM
03/20/11 05:08 PM
Joined: Jan 2003
Posts: 1,374
Houston,Tx.
L
Lee446 Offline OP
pro stock
Lee446  Offline OP
pro stock
L

Joined: Jan 2003
Posts: 1,374
Houston,Tx.
69 Satelite,528 hemi. This is mainly a street car and still uses a modified vb that retains auto function. Short story, went to a regional outlaw track for a fun run/race. Poor track prep, hooked hard on drag radials, got out about 30 ft and the tires broke loose/hooked up again and busted my sprag. In thirty years of street driving and bracket racing, this is the first time that I broke a trans and don't want to repeat it. Would upgrading to the Coan super sprag be a worthwhile investment? Are they just harder to break, or virtually unbrakeable? Do you have to do any other mods to use one? I looked on their site and read the instructions and it is basically a bolt in, I have a good torqueflite guy who builds my transmissions. I really dont know much about automatics, so any advice is welcome! Thanks, Lee.

Re: Coan super sprag for street, strengths/drawbacks? [Re: Lee446] #954620
03/20/11 05:18 PM
03/20/11 05:18 PM
Joined: Jan 2003
Posts: 74,907
U.S.S.A.
JohnRR Offline
I Win
JohnRR  Offline
I Win

Joined: Jan 2003
Posts: 74,907
U.S.S.A.
What exactly broke? I don't see any drawback to the super srag other than the cost. It has more rollers , they are a bit smaller in diameter , but the added amount of rollers makes it virtually impossible for the rollers to lay over which in turn allows the front drum or overspeed and EXPLODE should it reach that critical mass RPM. But making it so the rollers can not rollover will find the next potential weakness ... THE CASE .... but the Super sprag is a bolt in and I assume it's a 6 bolt like the A+A spag I just installed in a street trans I'm building. If so make sure you add the extra bolts if your trans has a 4 bolt rear support, it will require drilling holes in the case and potentially doing a little machining to the case. I spot faced where the new bolts sit and I think on a 1970 case I did I had to do some minor machining of a boss that was in the way, I counterbored it.

Short of it ... DO IT , you may or may not want to think about putting in a billet drum , the Super sprag will be extra insurance if you get a billet front drum.

Re: Coan super sprag for street, strengths/drawbacks? [Re: JohnRR] #954621
03/20/11 09:15 PM
03/20/11 09:15 PM
Joined: Jan 2003
Posts: 1,374
Houston,Tx.
L
Lee446 Offline OP
pro stock
Lee446  Offline OP
pro stock
L

Joined: Jan 2003
Posts: 1,374
Houston,Tx.
Don't know yet what all broke, I took it to my trans guy friday afternoon. He says that they frequently break the case internally when the sprag goes, but I saw nothing on the outside. I don't mind spending the money for the added safety factor, just wanted to make sure what else I might need to get to do the job. Any suggestions for other improvements ? Thanks!

Re: Coan super sprag for street, strengths/drawbacks? [Re: Lee446] #954622
03/20/11 10:16 PM
03/20/11 10:16 PM
Joined: Jul 2008
Posts: 30,253
Florida STAYcation
dIc dOc Deity ! Offline
The village idiot's idiot
dIc dOc Deity !  Offline
The village idiot's idiot

Joined: Jul 2008
Posts: 30,253
Florida STAYcation
OTHER than a low band apply manual VB ... there is NO WAY to get-away from the possibility of "busting" a sprag. I think that the aftermarket sprags are just another way dip-DEEP into your wallet.

I would just INSIST on better track-prep ....

..then have an uNdestructible front drum IN THERE ... like the steel one ..or the steel jacketed alum one.

Re: Coan super sprag for street, strengths/drawbacks? [Re: dIc dOc Deity !] #954623
03/20/11 10:30 PM
03/20/11 10:30 PM
Joined: Jan 2003
Posts: 4,616
Kissimmee Fl.
D
dusturbd340W5 Offline
master
dusturbd340W5  Offline
master
D

Joined: Jan 2003
Posts: 4,616
Kissimmee Fl.
well I can tell you that the Coan super sprag is using the sprag out of a ford c-6 trans and in 25 years in the business I have never seen a c-6 roll a sprag like the stock 727 do and that is because like stated above there are more rollers and there is just not enough room to roll them.
They are the only bolt in sprag that does anything for you other than save a bad case.


70 duster full chassis super pro 416 CNC Indybrock heads 727 w/brake

best so far 1.212 60 6.219 in 1/8 at 110.88 9.768 at 137.81 1/4
Re: Coan super sprag for street, strengths/drawbacks? [Re: dusturbd340W5] #954624
03/20/11 10:37 PM
03/20/11 10:37 PM
Joined: Jul 2008
Posts: 30,253
Florida STAYcation
dIc dOc Deity ! Offline
The village idiot's idiot
dIc dOc Deity !  Offline
The village idiot's idiot

Joined: Jul 2008
Posts: 30,253
Florida STAYcation
.... so the Coan sprag for a TF is an exact C-6 piece ?

Re: Coan super sprag for street, strengths/drawbacks? [Re: dusturbd340W5] #954625
03/21/11 01:09 AM
03/21/11 01:09 AM
Joined: Jan 2003
Posts: 74,907
U.S.S.A.
JohnRR Offline
I Win
JohnRR  Offline
I Win

Joined: Jan 2003
Posts: 74,907
U.S.S.A.
Quote:


They are the only bolt in sprag that does anything for you other than save a bad case.




The A+A sprag is different than the COAN but has more rollers also , I'm not familiar with the Coan but I can't see the A+A rolling over either .

Re: Coan super sprag for street, strengths/drawbacks? [Re: JohnRR] #954626
03/21/11 07:17 AM
03/21/11 07:17 AM
Joined: Jan 2003
Posts: 5,984
Anoka County, MN
L
Leigh Offline
master
Leigh  Offline
master
L

Joined: Jan 2003
Posts: 5,984
Anoka County, MN
They both are 16 element.

Re: Coan super sprag for street, strengths/drawbacks? [Re: Leigh] #954627
03/21/11 10:26 AM
03/21/11 10:26 AM
Joined: Jan 2003
Posts: 74,907
U.S.S.A.
JohnRR Offline
I Win
JohnRR  Offline
I Win

Joined: Jan 2003
Posts: 74,907
U.S.S.A.
Quote:

They both are 16 element.




I thought one had more than the other , if not then there isn't much difference then ... I guess ?

Re: Coan super sprag for street, strengths/drawbacks? [Re: JohnRR] #954628
03/21/11 06:19 PM
03/21/11 06:19 PM
Joined: Feb 2005
Posts: 2,709
NJ central
S
Scamp408 Offline
master
Scamp408  Offline
master
S

Joined: Feb 2005
Posts: 2,709
NJ central
c6 sprag

6542118-c6.jpg (230 downloads)
Re: Coan super sprag for street, strengths/drawbacks? [Re: dIc dOc Deity !] #954629
03/21/11 07:35 PM
03/21/11 07:35 PM
Joined: Jan 2003
Posts: 4,616
Kissimmee Fl.
D
dusturbd340W5 Offline
master
dusturbd340W5  Offline
master
D

Joined: Jan 2003
Posts: 4,616
Kissimmee Fl.
Quote:

.... so the Coan sprag for a TF is an exact C-6 piece ?




Yes a Coan sprag come with a new inner and outer race that uses a C-6 sprag assembly.


70 duster full chassis super pro 416 CNC Indybrock heads 727 w/brake

best so far 1.212 60 6.219 in 1/8 at 110.88 9.768 at 137.81 1/4
Re: Coan super sprag for street, strengths/drawbacks? [Re: dusturbd340W5] #954630
03/21/11 11:23 PM
03/21/11 11:23 PM
Joined: Jan 2003
Posts: 74,907
U.S.S.A.
JohnRR Offline
I Win
JohnRR  Offline
I Win

Joined: Jan 2003
Posts: 74,907
U.S.S.A.
Quote:

Quote:

.... so the Coan sprag for a TF is an exact C-6 piece ?




Yes a Coan sprag come with a new inner and outer race that uses a C-6 sprag assembly.




I think what the protologist is asking is if the entire assembly is a C6 piece and from your answer it is NO .

Re: Coan super sprag for street, strengths/drawbacks? [Re: JohnRR] #954631
03/22/11 09:20 PM
03/22/11 09:20 PM
Joined: Jan 2003
Posts: 4,616
Kissimmee Fl.
D
dusturbd340W5 Offline
master
dusturbd340W5  Offline
master
D

Joined: Jan 2003
Posts: 4,616
Kissimmee Fl.
Quote:

Quote:

Quote:

.... so the Coan sprag for a TF is an exact C-6 piece ?




Yes a Coan sprag come with a new inner and outer race that uses a C-6 sprag assembly.




I think what the protologist is asking is if the entire assembly is a C6 piece and from your answer it is NO .




correct only the spring and roller is a c6 inner and outer races are not.


70 duster full chassis super pro 416 CNC Indybrock heads 727 w/brake

best so far 1.212 60 6.219 in 1/8 at 110.88 9.768 at 137.81 1/4
Re: Coan super sprag for street, strengths/drawbacks? [Re: JohnRR] #954632
03/22/11 11:46 PM
03/22/11 11:46 PM
Joined: Jul 2008
Posts: 30,253
Florida STAYcation
dIc dOc Deity ! Offline
The village idiot's idiot
dIc dOc Deity !  Offline
The village idiot's idiot

Joined: Jul 2008
Posts: 30,253
Florida STAYcation
Quote:




protologist






U R a piece of wurk RR ... you said you blocked me months ago .. but now you follow-me-around like a little puppy-dog SMELLING around the "protologist" area ....

FIND another hobby RR ... you are BUSTED ...

.... and BTW ....the correct spelling is PROCTOLOGIST..... NUMBnutz ..

Re: Coan super sprag for street, strengths/drawbacks? [Re: dIc dOc Deity !] #954633
03/23/11 09:46 AM
03/23/11 09:46 AM
Joined: Jan 2003
Posts: 74,907
U.S.S.A.
JohnRR Offline
I Win
JohnRR  Offline
I Win

Joined: Jan 2003
Posts: 74,907
U.S.S.A.
Quote:

*** You are ignoring this user ***



Re: Coan super sprag for street, strengths/drawbacks? [Re: JohnRR] #954634
03/23/11 10:57 AM
03/23/11 10:57 AM
Joined: Jul 2008
Posts: 30,253
Florida STAYcation
dIc dOc Deity ! Offline
The village idiot's idiot
dIc dOc Deity !  Offline
The village idiot's idiot

Joined: Jul 2008
Posts: 30,253
Florida STAYcation
Ahhhhhh ..... ... now go to yerr PROCTOLOGIST !

Yurrr head is stuck up-there so often that surgery in-that-area must be a weekly-thing ferr you ... and this FINGER must be a hourly occurance ...

Now where IS the flippinthebirdatRR smilie when I need-it ? ... !!

Re: Coan super sprag for street, strengths/drawbacks? [Re: Lee446] #954635
10/13/11 04:44 PM
10/13/11 04:44 PM
Joined: May 2011
Posts: 4,488
northern,Ohio,USA
C
Clanton Offline
master
Clanton  Offline
master
C

Joined: May 2011
Posts: 4,488
northern,Ohio,USA
some good info here.i am needing to fix my sprag so if there are any result or info i would like to hear it.
Thanks!


GOTBOOST!New improved with Victor heads.
http://www.enginelabs.com/mopar-big-bloc...t-of-necessity/
Re: Coan super sprag for street, strengths/drawbacks? [Re: JohnRR] #954636
10/13/11 05:08 PM
10/13/11 05:08 PM
Joined: Jan 2003
Posts: 16,619
Almost Heaven
B_Body_Bob Offline
Master of nothing
B_Body_Bob  Offline
Master of nothing

Joined: Jan 2003
Posts: 16,619
Almost Heaven
Quote:

I assume it's a 6 bolt like the A+A spag I just installed in a street trans I'm building. If so make sure you add the extra bolts if your trans has a 4 bolt rear support, it will require drilling holes in the case and potentially doing a little machining to the case.




The Coan sprag in my transmission is 4 bolt.

6869767-IMG_3742.jpg (171 downloads)

Everybody makes fun of a hillbilly until they need something fixed
Re: Coan super sprag for street, strengths/drawbacks? [Re: Clanton] #954637
10/13/11 05:10 PM
10/13/11 05:10 PM
Joined: Mar 2004
Posts: 528
Oak Grove, MN
lowflyingdart Offline
mopar
lowflyingdart  Offline
mopar

Joined: Mar 2004
Posts: 528
Oak Grove, MN
Put in either the Coan or the A&A 16 element sprag. It will be just fine on the street. The only draw back is cost. We had a customer break a rear end with a 727 and a Coan Supersprag. The Sprag held, but was damaged. Most importantly it held and didn't overrun the drum.
Larry


"I have not failed. I've just found 10,000 ways that won't work." Thomas A. Edison
Re: Coan super sprag for street, strengths/drawbacks? [Re: B_Body_Bob] #954638
10/13/11 05:13 PM
10/13/11 05:13 PM
Joined: May 2011
Posts: 4,488
northern,Ohio,USA
C
Clanton Offline
master
Clanton  Offline
master
C

Joined: May 2011
Posts: 4,488
northern,Ohio,USA
thanks i just checked that out at coan.my rollers ran over most of the springs in there going from what is in my pan.


GOTBOOST!New improved with Victor heads.
http://www.enginelabs.com/mopar-big-bloc...t-of-necessity/
Re: Coan super sprag for street, strengths/drawbacks? [Re: lowflyingdart] #954639
10/13/11 05:16 PM
10/13/11 05:16 PM
Joined: May 2011
Posts: 4,488
northern,Ohio,USA
C
Clanton Offline
master
Clanton  Offline
master
C

Joined: May 2011
Posts: 4,488
northern,Ohio,USA
Quote:

Put in either the Coan or the A&A 16 element sprag. It will be just fine on the street. The only draw back is cost. We had a customer break a rear end with a 727 and a Coan Supersprag. The Sprag held, but was damaged. Most importantly it held and didn't overrun the drum.
Larry



mine is not for street use[heavy car3900# 1,000+ HP]


GOTBOOST!New improved with Victor heads.
http://www.enginelabs.com/mopar-big-bloc...t-of-necessity/
Re: Coan super sprag for street, strengths/drawbacks? [Re: JohnRR] #954640
10/14/11 12:09 AM
10/14/11 12:09 AM
Joined: Jan 2003
Posts: 16,917
NC
440Jim Offline
I Live Here
440Jim  Offline
I Live Here

Joined: Jan 2003
Posts: 16,917
NC
John,
Does the A&A Ultimate Sprag use 1/4 bolts with compression ferrels?

The Coan says it uses 8mm shoulder bolts, and the case bolt holes need to be enlarge since that is slightly larger than the stock 727 5/16 bolts that thread into the case (not the sprag).

Re: Coan super sprag for street, strengths/drawbacks? [Re: 440Jim] #954641
10/14/11 12:18 AM
10/14/11 12:18 AM
Joined: Nov 2009
Posts: 2,177
ill
D
dennismopar73 Offline
top fuel
dennismopar73  Offline
top fuel
D

Joined: Nov 2009
Posts: 2,177
ill
all these do help but if and its always a matter not if , but when it goes it will take anyones sprag!
most time the trannys junk either way,
just make sure you run a shield!

Re: Coan super sprag for street, strengths/drawbacks? [Re: dIc dOc Deity !] #954642
10/14/11 08:17 AM
10/14/11 08:17 AM
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Challenger 1 Offline
Too Many Posts
Challenger 1  Offline
Too Many Posts

Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Quote:

I think that the aftermarket sprags are just another way dip-DEEP into your wallet.

I would just INSIST on better track-prep ....

.




Always thinking someone is trying to rip him off, it get so old...

Yea sure there gonna prep the track better because you have weak trans, yea right.

Re: Coan super sprag for street, strengths/drawbacks? [Re: Challenger 1] #954643
10/14/11 10:36 AM
10/14/11 10:36 AM
Joined: Dec 2007
Posts: 12,587
Great Neck,LI,new york
hemi-itis Offline
I Live Here
hemi-itis  Offline
I Live Here

Joined: Dec 2007
Posts: 12,587
Great Neck,LI,new york
Doc is just bein' thrifty There are no drawbacks for an aftermarket sprag.My builder also installs "set screws" for the stock sprag unless it's been spun.I bought the billit steel drom from http://www.tcsproducts.com/products/subcategory/14/ As previously stated,the billit steel or even the steel lined aluminum drum is a very logical up grade.I dropped my trans off to Tom yesterday,he wants to use a babbit bearing for the new converter and trim off what has to go in order to use the new CSR sheild.Insurance for the new HP levels I will be playin' with

Last edited by hemi-itis; 10/14/11 10:38 AM.

HEMI-ITIS has no cure.
My condition is fully BLOWN!!
Re: Coan super sprag for street, strengths/drawbacks? [Re: Challenger 1] #954644
10/14/11 01:01 PM
10/14/11 01:01 PM
Joined: May 2003
Posts: 2,117
Cleveland Ohio
10secGTX Offline
top fuel
10secGTX  Offline
top fuel

Joined: May 2003
Posts: 2,117
Cleveland Ohio
Quote:

Quote:

I think that the aftermarket sprags are just another way dip-DEEP into your wallet.

I would just INSIST on better track-prep ....

.




Always thinking someone is trying to rip him off, it get so old...

Yea sure there gonna prep the track better because you have weak trans, yea right.




READ AGAIN

Short story, went to a regional outlaw track for a fun run/race. Poor track prep, hooked hard on drag radials, got out about 30 ft and the tires broke loose/hooked up again and busted my sprag

It was for FUN run not the world finals... track prep is usually 60' at your own risk.

I think the sprang and a griner V/B aka low band apply will be all the insurance you will need

Re: Coan super sprag for street, strengths/drawbacks? [Re: Challenger 1] #954645
10/14/11 01:12 PM
10/14/11 01:12 PM
Joined: Jul 2008
Posts: 30,253
Florida STAYcation
dIc dOc Deity ! Offline
The village idiot's idiot
dIc dOc Deity !  Offline
The village idiot's idiot

Joined: Jul 2008
Posts: 30,253
Florida STAYcation
Quote:

Quote:

I think that the aftermarket sprags are just another way dip-DEEP into your wallet.

I would just INSIST on better track-prep ....

.




Always thinking someone is trying to rip him off, it get so old...

Yea sure there gonna prep the track better because you have weak trans, yea right.




ChallyNONE ... why do you keep tryin' to bust-my-stones ? ESPECIALLY when you live-in such a glass-house(being in the LPG reselling biz) ... the most complained about energy supplier in the nation ...

AND now with your MAN CARD revoked ...

Re: Coan super sprag for street, strengths/drawbacks? [Re: hemi-itis] #954646
10/14/11 01:18 PM
10/14/11 01:18 PM
Joined: Jul 2008
Posts: 30,253
Florida STAYcation
dIc dOc Deity ! Offline
The village idiot's idiot
dIc dOc Deity !  Offline
The village idiot's idiot

Joined: Jul 2008
Posts: 30,253
Florida STAYcation
Quote:

Doc is just bein' thrifty There are no drawbacks for an aftermarket sprag.






..and the hemi- should go on a gauge-weight DIET ! ..... ONLY reason to go to a aftermarket sprag is if your case is damaged and you can't use a OEM piece.

BUTTTT ... there IS a draw-back ...you are emptying your wallet uNnecessarly .... but if you want to spend your money IN ANY WAY you see fit ... go-ferr-it

Re: Coan super sprag for street, strengths/drawbacks? [Re: dIc dOc Deity !] #954647
10/14/11 01:36 PM
10/14/11 01:36 PM
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Challenger 1 Offline
Too Many Posts
Challenger 1  Offline
Too Many Posts

Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Quote:

Quote:

Quote:

I think that the aftermarket sprags are just another way dip-DEEP into your wallet.

I would just INSIST on better track-prep ....

.




Always thinking someone is trying to rip him off, it get so old...

Yea sure there gonna prep the track better because you have weak trans, yea right.




ChallyNONE ... why do you keep tryin' to bust-my-stones ? ESPECIALLY when you live-in such a glass-house(being in the LPG reselling biz) ... the most complained about energy supplier in the nation ...

AND now with your MAN CARD revoked ...




Very successfully I might add for 27 years now!
What have you done sucessfully Doc?

Re: Coan super sprag for street, strengths/drawbacks? [Re: Challenger 1] #954648
10/14/11 01:45 PM
10/14/11 01:45 PM
Joined: Jul 2008
Posts: 30,253
Florida STAYcation
dIc dOc Deity ! Offline
The village idiot's idiot
dIc dOc Deity !  Offline
The village idiot's idiot

Joined: Jul 2008
Posts: 30,253
Florida STAYcation
Yeah ... you should have had your MAN CARD revoked YEARS ago ..

What I have I done successfully ? ... ran a WORLD FAMOUS fiberglass business for years. And lately ? ... bought a few shares of Apple stock ....

And I would not BE PROUD of LPG reselling ... they are famous for ripping-people-off. LOOK UP the Michigan AG records for the largest fine ever levied and paid ....Inergy PROpain !

WHY do you INSIST on getting and every time you come-after me ?


You MUST like it .....

Re: Coan super sprag for street, strengths/drawbacks? [Re: Challenger 1] #954649
10/14/11 01:46 PM
10/14/11 01:46 PM
Joined: Nov 2005
Posts: 1,943
San Angelo, Texas, U.S.A.
1968RR Offline
top fuel
1968RR  Offline
top fuel

Joined: Nov 2005
Posts: 1,943
San Angelo, Texas, U.S.A.
Bottom line: your sprag is less likely to fail if it's a bolt-in. They're not that expensive and there really is no drawback in using one.


"When I'm in a slump, I comfort myself by saying if I believe in dinosaurs, then somewhere, they must be believing in me. And if they believe in me, then I can believe in me." - Mookie Wilson
Re: Coan super sprag for street, strengths/drawbacks? [Re: 1968RR] #954650
10/14/11 01:56 PM
10/14/11 01:56 PM
Joined: Jul 2008
Posts: 30,253
Florida STAYcation
dIc dOc Deity ! Offline
The village idiot's idiot
dIc dOc Deity !  Offline
The village idiot's idiot

Joined: Jul 2008
Posts: 30,253
Florida STAYcation
I have done MANY 727 and 904 transmissions ...and I don't think that I have seen more than TWO trans with a spun cam.

AGAIN ...spend you $$$ as you see fit.

Re: Coan super sprag for street, strengths/drawbacks? [Re: 440Jim] #954651
10/14/11 02:48 PM
10/14/11 02:48 PM
Joined: Jan 2003
Posts: 16,917
NC
440Jim Offline
I Live Here
440Jim  Offline
I Live Here

Joined: Jan 2003
Posts: 16,917
NC
Back to the topic at hand... (please)

Quote:

John,
Does the A&A Ultimate Sprag use 1/4 bolts with compression ferrels?

The Coan says it uses 8mm shoulder bolts, and the case bolt holes need to be enlarge since that is slightly larger than the stock 727 5/16 bolts that thread into the case (not the sprag).




Re: Coan super sprag for street, strengths/drawbacks? [Re: 440Jim] #954652
10/14/11 03:13 PM
10/14/11 03:13 PM
Joined: Jun 2005
Posts: 4,041
michigan woods
imfixinmopars426 Offline
master
imfixinmopars426  Offline
master

Joined: Jun 2005
Posts: 4,041
michigan woods
what a bunch of babies....geez.
back to the sprag; my understanding is;
1. add a bolt in to prevent the oem from spinning in the case,or damaged case from one already spun
2.buy a "good" bolt-in if hi hp levels,[added rollers] more $$$$
3.the cheap four bolts are avalible,for home do it your selfers 80.00\
and they have ferrels to kinda take up the hole to bolt slop
4.good ones have shoulder type and added number of rollers [c-6 unit]
have CRT do the trans.. ...mike

Re: Coan super sprag for street, strengths/drawbacks? [Re: dIc dOc Deity !] #954653
10/14/11 04:18 PM
10/14/11 04:18 PM
Joined: Mar 2009
Posts: 1,058
bigfork mn
D
dragram440 Offline
super stock
dragram440  Offline
super stock
D

Joined: Mar 2009
Posts: 1,058
bigfork mn
Quote:

I have done MANY 727 and 904 transmissions ...and I don't think that I have seen more than TWO trans with a spun cam.

AGAIN ...spend you $$$ as you see fit.



I had a bolt in c6 sprag in my 727 and it only lasted about 8 passes and it rolled the rollers and busted the case. Not sure why. Always did secound gear burnouts and car seemed to hook up pretty dang good.Now I have about 25 passes on the new trans and seems to be working ok.


67' charger 499 RB 10.57 at 127
Re: Coan super sprag for street, strengths/drawbacks? [Re: Lee446] #954654
10/14/11 05:00 PM
10/14/11 05:00 PM
Joined: Jan 2003
Posts: 25,618
Rio Linda, CA
John_Kunkel Offline
Too Many Posts
John_Kunkel  Offline
Too Many Posts

Joined: Jan 2003
Posts: 25,618
Rio Linda, CA
Quote:

69 Satelite,528 hemi. This is mainly a street car and still uses a modified vb that retains auto function. Short story, went to a regional outlaw track for a fun run/race. Poor track prep, hooked hard on drag radials, got out about 30 ft and the tires broke loose/hooked up again and busted my sprag.




If the VB "retains auto function" it would still apply the rear band in 1st. Were you in Drive when the sprag failed?


The INTERNET, the MISinformation superhighway
Re: Coan super sprag for street, strengths/drawbacks? [Re: John_Kunkel] #954655
10/14/11 06:05 PM
10/14/11 06:05 PM
Joined: May 2011
Posts: 4,488
northern,Ohio,USA
C
Clanton Offline
master
Clanton  Offline
master
C

Joined: May 2011
Posts: 4,488
northern,Ohio,USA
my sprag rolling over the springs is the only problem i have had in 20yrs and that sprag was put in in maybe 1995.i am sure it is the 12 roller so maybe it is time for the 16.


GOTBOOST!New improved with Victor heads.
http://www.enginelabs.com/mopar-big-bloc...t-of-necessity/
Re: Coan super sprag for street, strengths/drawbacks? [Re: Clanton] #954656
10/15/11 11:57 AM
10/15/11 11:57 AM
Joined: Jan 2003
Posts: 1,374
Houston,Tx.
L
Lee446 Offline OP
pro stock
Lee446  Offline OP
pro stock
L

Joined: Jan 2003
Posts: 1,374
Houston,Tx.
Boy, this got resurected from way back! To answer your question John, yes, it was in drive. I have a 6500 governer in it and that is why I have a auto VB in it, so I can let it do its thing. I don't want to give up the column shift, which I have never been able to get tightned up enough to feel confident manually shifting without overshooting and I don't want a MVB. With a wedge, the car was deadly consistant in drive bracket racing, and I used it that way for years with no problems. I'm beginning to think I was just real lucky!

Re: Coan super sprag for street, strengths/drawbacks? [Re: Lee446] #954657
10/15/11 05:00 PM
10/15/11 05:00 PM
Joined: Jan 2003
Posts: 25,618
Rio Linda, CA
John_Kunkel Offline
Too Many Posts
John_Kunkel  Offline
Too Many Posts

Joined: Jan 2003
Posts: 25,618
Rio Linda, CA

If you make a conscious decision to leave the line in Drive you risk losing the sprag...no matter who makes it.


The INTERNET, the MISinformation superhighway
Re: Coan super sprag for street, strengths/drawbacks? [Re: 1968RR] #954658
10/15/11 09:15 PM
10/15/11 09:15 PM
Joined: Jan 2003
Posts: 74,907
U.S.S.A.
JohnRR Offline
I Win
JohnRR  Offline
I Win

Joined: Jan 2003
Posts: 74,907
U.S.S.A.
Quote:

Bottom line: your sprag is less likely to fail if it's a bolt-in. They're not that expensive and there really is no drawback in using one.




Only half correct , The factory type sprag with a bolt in outer race will still fail by having the rollers rollover , the Coan or A+A sprag has more rollers so it is virtually impossible to have the rollers fail.

Just replacing the outer race to a bolt in type on a trans that has not had the outer race spin in the case is a waste of time and money.

Last edited by JohnRR; 10/18/11 10:32 AM.
Re: Coan super sprag for street, strengths/drawbacks? [Re: 440Jim] #954659
10/15/11 09:20 PM
10/15/11 09:20 PM
Joined: Jan 2003
Posts: 74,907
U.S.S.A.
JohnRR Offline
I Win
JohnRR  Offline
I Win

Joined: Jan 2003
Posts: 74,907
U.S.S.A.
Quote:

Back to the topic at hand... (please)

Quote:

John,
Does the A&A Ultimate Sprag use 1/4 bolts with compression ferrels?

The Coan says it uses 8mm shoulder bolts, and the case bolt holes need to be enlarge since that is slightly larger than the stock 727 5/16 bolts that thread into the case (not the sprag).








Sorry Jim I missed this question the first time around ....

Yes the A+A uses the 1/4" bolts and ferrules , I also machine the case and add the 2 extra bolts that the A+A allows you to use because it is a 6 bolt.

Re: Coan super sprag for street, strengths/drawbacks? [Re: JohnRR] #954660
10/15/11 10:22 PM
10/15/11 10:22 PM
Joined: May 2011
Posts: 4,488
northern,Ohio,USA
C
Clanton Offline
master
Clanton  Offline
master
C

Joined: May 2011
Posts: 4,488
northern,Ohio,USA
some good info guys,thanks!


GOTBOOST!New improved with Victor heads.
http://www.enginelabs.com/mopar-big-bloc...t-of-necessity/
Re: Coan super sprag for street, strengths/drawbacks? [Re: Clanton] #954661
10/15/11 11:33 PM
10/15/11 11:33 PM
Joined: Jan 2003
Posts: 5,984
Anoka County, MN
L
Leigh Offline
master
Leigh  Offline
master
L

Joined: Jan 2003
Posts: 5,984
Anoka County, MN
For what it's worth, those shoulder bolts from Coan are not the best. The broach of the internal hex, is iffy, at best. The last one I used (3rd unit), I made my own spacers, out of steel tubing (like I have since 1978). MUCH better fit, and no worries about stripping the internal hex for the next builder to hassle with. Also, I personally don't see the need to add the extra 2 bolts. Any application that can sheer off 4 bolts, should have a low band apply V/B anyway.

Re: Coan super sprag for street, strengths/drawbacks? [Re: Leigh] #954662
10/16/11 01:32 PM
10/16/11 01:32 PM
Joined: Jan 2003
Posts: 74,907
U.S.S.A.
JohnRR Offline
I Win
JohnRR  Offline
I Win

Joined: Jan 2003
Posts: 74,907
U.S.S.A.
Leigh I just do it for piece of mind knowing it's still bolted tight if you have to pull the rear drum /gov. support , takes about 20 mins in the bridgeport , drill 2 holes and spot face.

I like your fix with the steel tubes, I think someone did something similar with brake line ?

Re: Coan super sprag for street, strengths/drawbacks? [Re: Leigh] #954663
10/17/11 01:29 PM
10/17/11 01:29 PM
Joined: Jan 2003
Posts: 16,917
NC
440Jim Offline
I Live Here
440Jim  Offline
I Live Here

Joined: Jan 2003
Posts: 16,917
NC
Quote:

For what it's worth, those shoulder bolts from Coan are not the best. The broach of the internal hex, is iffy, at best. The last one I used (3rd unit), I made my own spacers, out of steel tubing (like I have since 1978). MUCH better fit, and no worries about stripping the internal hex for the next builder to hassle with.



Thanks for the info/experience.
Did you use 1/4 bolts instead of the shoulder bolts and drill the case to 5/16 and make a sleeve to fill the case and fit the 1/4" bolts nicely?
Is the Coan race tapped 1/4-28?

The shoulder bolts look like a good idea, but if the hardware is marginal, that defeats the improvement. Although I don't like the compression ferrels to fit smaller (i.e. 1/4") bolts into the case, I have never heard of any problems with them. And many standard bolt-in sprags use that method.

Re: Coan super sprag for street, strengths/drawbacks? [Re: JohnRR] #954664
10/17/11 06:32 PM
10/17/11 06:32 PM
Joined: Nov 2005
Posts: 1,943
San Angelo, Texas, U.S.A.
1968RR Offline
top fuel
1968RR  Offline
top fuel

Joined: Nov 2005
Posts: 1,943
San Angelo, Texas, U.S.A.
Quote:

Quote:

Bottom line: your sprag is less likely to fail if it's a bolt-in. They're not that expensive and there really is no drawback in using one.




Only half correct , The facory type sprag wit ha bolt in outer race will still fail by having the rollers rollover , the Cona or A+A sprag has more rollers so it is virtually impossible to have the rollers fail.

Just replacing the outer race to a bolt in type on a trans that has not had the outer race spin in the case is a waste of time and money.



You make a good point about the roller rollover, but even if the outer race has never been spun, installing a bolt-in sprag will still lessen the chance of it ever spinning (the force required would need to be much greater).


"When I'm in a slump, I comfort myself by saying if I believe in dinosaurs, then somewhere, they must be believing in me. And if they believe in me, then I can believe in me." - Mookie Wilson
Page 1 of 3 1 2 3






Powered by UBB.threads™ PHP Forum Software 7.7.1