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Re: whose the fastest on an 8 3/4
[Re: MR_P_BODY]
#1771438
03/04/15 10:26 PM
03/04/15 10:26 PM
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Joined: Jan 2003
Posts: 32,394
Quicktree
I Win
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I Win
Joined: Jan 2003
Posts: 32,394
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Somebody should come up w/ some type of formula that takes into account car weight, engine HP & torque, 60-ft, ET, MPH, etc., to be able to define a factor to use in comparing these. 
I have a formula.........when it breaks, you have gone too far with weight and or power............LOL!!!
then you can buy a new tranny to boot....
That ISNT FACT... when I blew the stock 8 3/4 I
pulled the trans to make sure.. it was fine.. still
running the same trans and the same sprag
it is fact I can show you the pieces
You act like EVERY one will blow the sprag... NOT..
and I have a trans that says so
I didn't say that, but the chances are pretty good 
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Re: whose the fastest on an 8 3/4
[Re: Quicktree]
#1771439
03/04/15 10:31 PM
03/04/15 10:31 PM
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Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
BradH
Taking time off to work on my car
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Taking time off to work on my car
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
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Somebody should come up w/ some type of formula that takes into account car weight, engine HP & torque, 60-ft, ET, MPH, etc., to be able to define a factor to use in comparing these.
I have a formula.........when it breaks, you have gone too far with weight and or power............LOL!!!
then you can buy a new tranny to boot....
That ISNT FACT... when I blew the stock 8 3/4 I
pulled the trans to make sure.. it was fine.. still
running the same trans and the same sprag
it is fact I can show you the pieces
You act like EVERY one will blow the sprag... NOT..
and I have a trans that says so
I didn't say that, but the chances are pretty good
Then it's not a fact, just a highly probable outcome.
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Re: whose the fastest on an 8 3/4
[Re: Quicktree]
#1771440
03/04/15 10:32 PM
03/04/15 10:32 PM
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Joined: Oct 2009
Posts: 1,267
North, Alabama
D-50
pro stock
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pro stock
Joined: Oct 2009
Posts: 1,267
North, Alabama
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When I broke my passenger car 9 in rear I took my stock 727 trans out because I was afraid I killed the sprag but everything was fine so I told the guy to put it back together.
1.33 60 ft,6.21 at 110.59 in the 1/8, pump gas small block,2950lbs,drag radials,mufflers and driven to track ...
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Re: whose the fastest on an 8 3/4
[Re: BradH]
#1771441
03/04/15 10:33 PM
03/04/15 10:33 PM
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Joined: Jan 2003
Posts: 32,394
Quicktree
I Win
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I Win
Joined: Jan 2003
Posts: 32,394
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Quote:
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Somebody should come up w/ some type of formula that takes into account car weight, engine HP & torque, 60-ft, ET, MPH, etc., to be able to define a factor to use in comparing these.
I have a formula.........when it breaks, you have gone too far with weight and or power............LOL!!!
then you can buy a new tranny to boot....
That ISNT FACT... when I blew the stock 8 3/4 I
pulled the trans to make sure.. it was fine.. still
running the same trans and the same sprag
it is fact I can show you the pieces
You act like EVERY one will blow the sprag... NOT..
and I have a trans that says so
I didn't say that, but the chances are pretty good
Then it's not a fact, just a highly probable outcome.
isn't that the same? 
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Re: whose the fastest on an 8 3/4
[Re: Quicktree]
#1771443
03/04/15 10:47 PM
03/04/15 10:47 PM
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Joined: Oct 2007
Posts: 3,978
Hilltown Pa
1967dartgt
master
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master
Joined: Oct 2007
Posts: 3,978
Hilltown Pa
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I have been 8.57@162 while weighting 3195. It has a 422 small block on spray in it. Only had 225 hp in it. The rear is still in n car and making passes. On another note when it sheared the ring gear bolts I pulled the trans apart and the sprag was fine.
Brett Miller W9 cnc'd heads
STR Chassis fabraction
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Re: whose the fastest on an 8 3/4
[Re: 1967dartgt]
#1771444
03/04/15 10:53 PM
03/04/15 10:53 PM
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Joined: Jun 2005
Posts: 2,776
Ontario Canada
MattW
master
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master
Joined: Jun 2005
Posts: 2,776
Ontario Canada
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Quote:
I have been [Email]8.57@162[/Email] while weighting 3195. It has a 422 small block on spray in it. Only had 225 hp in it. The rear is still in n car and making passes. On another note when it sheared the ring gear bolts I pulled the trans apart and the sprag was fine.
Man oh man! U R pushing your luck,
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Re: whose the fastest on an 8 3/4
[Re: MR_P_BODY]
#1771447
03/04/15 11:14 PM
03/04/15 11:14 PM
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Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
BradH
Taking time off to work on my car
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Taking time off to work on my car
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
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Quote:
Then it's not a fact, just a highly probable outcome.
BOTH YOU and Tony fail to ask the FIRST question...
Actually, I didn't ask ANY question. I simply stated that it's not a FACT (as Tony claimed) if there are examples that people have broken their diffs WITHOUT having subsequent transmission damage.
E-nuff of this. I have a beefed-up 8.75" and haven't broken it, but am upgrading my rear axle assembly so I'm not the next guy who has to end his day-at-the-track story with "... and then I broke the rear end."
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Re: whose the fastest on an 8 3/4
[Re: BradH]
#1771448
03/05/15 12:43 AM
03/05/15 12:43 AM
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Joined: Jul 2006
Posts: 4,319
Puyallup, WA
StealthWedge67
master
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master
Joined: Jul 2006
Posts: 4,319
Puyallup, WA
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I think Ron Nies' 63 is putting a lot of hurt on his 8-3/4, considering mid 10's in a B-Body that I'm sure weighs in at least 3600. His rear is pretty stock too, with a locker being the only upgrade I've heard him speak of.
Last edited by StealthWedge67; 03/05/15 12:54 AM.
LemonWedge - Street heavy / Strip ready - 11.07 @ 120
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Re: whose the fastest on an 8 3/4
[Re: KOS]
#1771451
03/05/15 01:26 AM
03/05/15 01:26 AM
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Joined: Oct 2009
Posts: 1,267
North, Alabama
D-50
pro stock
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pro stock
Joined: Oct 2009
Posts: 1,267
North, Alabama
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In my Demon I broke the teeth off a set of 4.30's (7.20's in the 1/8)and one of the caps on the 8 3/4 with a set of 5.13's ( spraying 100 shot of Nitrous)and of course half the teeth off of the ring gear after that. The spider gears were welded together on both of them ( Poor mans locker).
Last edited by D-50; 03/05/15 01:30 AM.
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Re: whose the fastest on an 8 3/4
[Re: D-50]
#1771452
03/05/15 11:41 AM
03/05/15 11:41 AM
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Joined: Dec 2009
Posts: 20,640
in a cattle trailer down by th...
Guitar Jones
Paddle faster! I hear banjo music!
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Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 20,640
in a cattle trailer down by th...
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Plenty of guys faster than my pile, see sig. Mine has the aluminum center section and pro gears, 30 spline spool and axles at 2760 pounds. Haven't broken a ring gear since going to the pro gear.
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost coming soon!
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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Re: whose the fastest on an 8 3/4
[Re: 1967dartgt]
#1771454
03/05/15 01:26 PM
03/05/15 01:26 PM
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Joined: Jan 2003
Posts: 13,363
Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,363
Marion, South Carolina [><]
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11.40s at 3700# broke the 8.75 suregrip. Upgraded to a spool and 35 spline axles.
When I put the Indy headed 440 in the car, the 8.75 sheared the teeth off the pinion and got some of the ring gear at 10.70s at 3700# while trying to sort out the new combo. After that, I put the Dana in and wound up going 10.40s all sorted out.
CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
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Re: whose the fastest on an 8 3/4
[Re: an8sec70cuda]
#1771455
03/05/15 03:49 PM
03/05/15 03:49 PM
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Joined: Jan 2005
Posts: 3,635
Oakland, MI
dizuster
master
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master
Joined: Jan 2005
Posts: 3,635
Oakland, MI
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There is a lot to goes into it, that's why people have so many different opinions on it.
Everything has a fatigue life... crank shafts, ring gears, axles, etc...
The harder you stress anything (either more power or more weight), the shorter the lifespan of the part will be.
My 3.23 gear (heavy load) sheared the pinion off... didn't even make it 50 passes behind my 3700lb mid/low 10 second tuneup. But the STOCK axles survived.
Lots of guys have broken axles without hurting ring gears.
It's not one thing that fails, or one weight, or one power level, its a combination of things.
Generally though just from what guys have done, regular 3300lb race weight is good down to around 10 flat or so. There are certainly failures at that point, and certainly people that have gone quicker... but it's a good rule of thumb that will PROBABLY ensure a reasonable lifespan out of the parts.
For the record, my clean break on the pinion killed the sprag too. I highly recommend that you ALWAYS at least look at the sprag if you hurt the rear axle/u-joint.
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Re: whose the fastest on an 8 3/4
[Re: BradH]
#1771457
03/05/15 04:27 PM
03/05/15 04:27 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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I have a set of Strange 35 spline axles that had a full spline width twist in the splined end right out from the spool.. they were still working but I changed them out only because I had another set of them.. I paint a white line down the whole length of each axle just to monitor the twist... the stock 8 3/4 that I first started out with had stock axles... they had just over a full twist in the length.. they didnt break either but I knew it wasnt gonna be to long for them... but then I blew the cap off the center and thats when I changed to the alum center and the good parts.. that was right at 600 passes on the stock 8 3/4 with 1.24-1.26 60'
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