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Re: Mark Williams 8-3/4 caps worth it? [Re: StealthWedge67] #2418077
12/13/17 06:00 PM
12/13/17 06:00 PM
Joined: Jan 2003
Posts: 13,318
Marion, South Carolina [><]
an8sec70cuda Offline
I Live Here
an8sec70cuda  Offline
I Live Here

Joined: Jan 2003
Posts: 13,318
Marion, South Carolina [><]
No, not for $200. Looks like the MW caps are $130 EACH (quick ebay search). Not sure what it'd cost to machine the centersection for them, but I'd guess around 100 bucks. About the same as narrowing a rear. Even w/ the good caps, the main problem w/ the 8.75 is still not addressed and you'll still kill gearsets.

I've bought 2 junkyard Dana 60s for $125-150 each. Both came w/ good gearsets and one had the good powerlock diff. So after the initial cost, a pair of axles and housing ends, narrowing, and a pair of perches...ready to bolt in. The brake lines are what, 20 bucks max at the parts store. One of mine already had a 1350 yoke too.

I agree that if you already have a well set up 8.75, swapping to a Dana doesn't SEEM like a cheap option, but it is. Sell the 8.75 to someone who thinks they can use it and build a Dana. Then you can sleep well knowing you'll likely never break your rear again.



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
Re: Mark Williams 8-3/4 caps worth it? [Re: StealthWedge67] #2418080
12/13/17 06:08 PM
12/13/17 06:08 PM
Joined: Jan 2003
Posts: 20,348
Eagle, Idaho
Neil Offline OP
The Doctor is in.
Neil  Offline OP
The Doctor is in.

Joined: Jan 2003
Posts: 20,348
Eagle, Idaho
Machined as in having the mating faces shaved so the inside is perfectly round when it goes together? There is a diff shop here that knows their stuff, but I don't know if they can do the machining depending on what needs done. I have not talked to them about the caps.

I have a 489 case with 3.55 gears and a solid spacer. It was clear powdercoated years ago and it started to rust under the clear + it was weeping oil in a few spots so I took it out and removed the clear. I was just going to bolt it back in until I saw the MW caps.

I know the ring gear teeth can shear off and the axle tubes will bend inward under heavy racing. I know a local guy who ran one forever in a first gen Cuda and it wasn't until his car became capable of pulling the front end off the track did he start to have issues making him go to a Dana 60.

Re: Mark Williams 8-3/4 caps worth it? [Re: Neil] #2418085
12/13/17 06:30 PM
12/13/17 06:30 PM
Joined: Jan 2005
Posts: 1,768
Keymar, MD
DusterKid Offline
top fuel
DusterKid  Offline
top fuel

Joined: Jan 2005
Posts: 1,768
Keymar, MD
My dad had a 8 3/4 in his duster back in the mid 90's. (440 ran 7.30's in the 1/8th has been in the 6.80's more recent years) Would break a ring and pinion every year. Finally put a Dana in it in the late 90's and hasn't broke anything in the rear since... He did build a duster for my sister in 2011 with a 360 run's 11.80's with the 8 3/4 and hasn't had a problem with it...Keep the build simple and low torque and you'll be fine. Increase torque and power, you'll find the weak link.

Re: Mark Williams 8-3/4 caps worth it? [Re: DusterKid] #2418112
12/13/17 07:38 PM
12/13/17 07:38 PM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
Master
MR_P_BODY  Offline
Master

Joined: Jun 2003
Posts: 52,972
Romeo MI
I run high 8s in the 1/4 with a alum 8 3/4 but
the car in light.. I wouldnt waste my time with
a dana 60.. just go to a 9" which I did for my
Rampage being its a bit heavier.. its 2860 race
ready with a 18 gals of fuel.. but thats me..
the guys on this site think you HAVE to run a dana
when you dont.. JMO.. if your not running a tank
or have a ton of power then your fine.. it will
run a lot of years... its up to you what you want
and so far its been a 8 3/4 being that your looking
at caps
wave

Re: Mark Williams 8-3/4 caps worth it? [Re: DusterKid] #2418115
12/13/17 07:44 PM
12/13/17 07:44 PM
Joined: Jul 2004
Posts: 19,317
State of confusion
T
Thumperdart Offline
I Live Here
Thumperdart  Offline
I Live Here
T

Joined: Jul 2004
Posts: 19,317
State of confusion
Originally Posted By DusterKid
My dad had a 8 3/4 in his duster back in the mid 90's. (440 ran 7.30's in the 1/8th has been in the 6.80's more recent years) Would break a ring and pinion every year. Finally put a Dana in it in the late 90's and hasn't broke anything in the rear since... He did build a duster for my sister in 2011 with a 360 run's 11.80's with the 8 3/4 and hasn't had a problem with it...Keep the build simple and low torque and you'll be fine. Increase torque and power, you'll find the weak link.


Please explain then how my stock capped 742 case has lived 14+ years and most of that at 3200 lbs. w/a BB 470, running low 6's in the 1/8 and 9.70`s(5 years ago)in the 1/4 w/1.3 60 fts.............. work


72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
Re: Mark Williams 8-3/4 caps worth it? [Re: Neil] #2418125
12/13/17 07:58 PM
12/13/17 07:58 PM
Joined: Jan 2003
Posts: 74,904
U.S.S.A.
JohnRR Offline
I Win
JohnRR  Offline
I Win

Joined: Jan 2003
Posts: 74,904
U.S.S.A.
Originally Posted By Neil
Machined as in having the mating faces shaved so the inside is perfectly round when it goes together? There is a diff shop here that knows their stuff, but I don't know if they can do the machining depending on what needs done. I have not talked to them about the caps.

I have a 489 case with 3.55 gears and a solid spacer. It was clear powdercoated years ago and it started to rust under the clear + it was weeping oil in a few spots so I took it out and removed the clear. I was just going to bolt it back in until I saw the MW caps.

I know the ring gear teeth can shear off and the axle tubes will bend inward under heavy racing. I know a local guy who ran one forever in a first gen Cuda and it wasn't until his car became capable of pulling the front end off the track did he start to have issues making him go to a Dana 60.


When I did it I went to my engine builder with the empty chuck and the cap, he did the gross cut in the milling machine and the final cut in is rod cap grinder. At minimun do the left side, ring gear side, that side sees the higher loading.


running up my post count some more .
Re: Mark Williams 8-3/4 caps worth it? [Re: Neil] #2418145
12/13/17 08:57 PM
12/13/17 08:57 PM
Joined: Mar 2006
Posts: 9,791
MI, usa
dvw Offline
master
dvw  Offline
master

Joined: Mar 2006
Posts: 9,791
MI, usa
I have no issue running 8 3/4. 2 of my cars use stock parts without failure (12.50 stick, 11.0 auto). But if it was going in a car that was going to be raced often I'd use a junkyard Dana. Mine and Dizusters turbo car got new ends, axles, and a spool. I cut the ends and brackets off and welded on new perches and ends. Both started out as a 8 lug full floaters. Dizusters still uses the junkyard gear set. Mine uses recycled 8 3/4 factory housing ends. Spool, axles, and gears cost the same either way. With a Dana you'll get either a 3.55 or 4.10 so you may not even need to buy a gear. I'm cheap. Junkyard Dana's are a great bang for the buck.
Doug

Re: Mark Williams 8-3/4 caps worth it? [Re: Neil] #2418147
12/13/17 09:00 PM
12/13/17 09:00 PM
Joined: May 2004
Posts: 12,379
Taxes & Virus's R-US, NY
Dragula Offline
I Live Here
Dragula  Offline
I Live Here

Joined: May 2004
Posts: 12,379
Taxes & Virus's R-US, NY
Yes, but you will have to size them....


'70 Cuda,...605 EFI Hemi Street Car (6.20 best pass, 1.33 60ft)
https://www.youtube.com/watch?v=WYw6RA-k5Bk (6.25 at 108.75mph from inside car)
https://www.youtube.com/watch?v=3zQEb9uxFng (6.25 at 108mph from outside car)
https://www.youtube.com/watch?v=JCvfzsC4NgM (9.9)

'66 Barracuda AWB Stretched nose Blown 440 Car in build stage

'71 Duster Drag Car 400 Low Deck 512 best 6.002 at 115.44mph
https://www.youtube.com/watch?v=Znuo3jMUXTk
Re: Mark Williams 8-3/4 caps worth it? [Re: Neil] #2418221
12/13/17 11:27 PM
12/13/17 11:27 PM
Joined: Jan 2003
Posts: 17,916
Akron, Ohio
ProSport Offline
I Live Here
ProSport  Offline
I Live Here

Joined: Jan 2003
Posts: 17,916
Akron, Ohio
My car runs mid 10's on a drag radial, footbraking. I don't have money to upgrade to a Dana or 9" right now so I bought a brand new Yukon Nodular iron center section with nodular caps for $250 With a spool and 35 spline axles I think it's good enough for now with my setup. Just another option for you.


1970 Challenger, all aluminum 528 Hemi, HDK suspension, Tremec 5 speed manual
Re: Mark Williams 8-3/4 caps worth it? [Re: Neil] #2418285
12/14/17 01:12 AM
12/14/17 01:12 AM
Joined: Jan 2003
Posts: 8,016
Polson, MT
DoctorDiff Offline
master
DoctorDiff  Offline
master

Joined: Jan 2003
Posts: 8,016
Polson, MT
FWIW, I sell a new, super duty nodular iron 489 case with forged steel (counter-sunk allen bolt style) caps, and billet steel adjusters for $300.

You will spend more than that to put MW caps on a used case.

Re: Mark Williams 8-3/4 caps worth it? [Re: Neil] #2418360
12/14/17 08:27 AM
12/14/17 08:27 AM
Joined: Jul 2005
Posts: 384
Australia
M
Mcode69 Offline
enthusiast
Mcode69  Offline
enthusiast
M

Joined: Jul 2005
Posts: 384
Australia
Just a bit more info on this, these caps are $105 if purchased from MW enterprises direct, someone is trying to make a fast buck out of a great manufacturer, and as far as I can find out the only one still producing this item.

Re: Mark Williams 8-3/4 caps worth it? [Re: Neil] #2418363
12/14/17 09:10 AM
12/14/17 09:10 AM
Joined: Aug 2008
Posts: 4,049
Mo.
racerx Offline
master
racerx  Offline
master

Joined: Aug 2008
Posts: 4,049
Mo.
I run one on my 489 center section for 20-something years lol, been 1.20's with a best of 1.26@3350 with no problem, but if I had to to it all over my choice will be a 9".Like Mr.P Body say I like the removable center section twocents

Re: Mark Williams 8-3/4 caps worth it? [Re: Neil] #2418366
12/14/17 09:31 AM
12/14/17 09:31 AM
Joined: Jan 2003
Posts: 9,963
Frostbitefalls MN (Rocky&Bullw...
gregsdart Offline
master
gregsdart  Offline
master

Joined: Jan 2003
Posts: 9,963
Frostbitefalls MN (Rocky&Bullw...
If you ever think you will use a transbrake, or go to a bigger motor (bb)? I would lean to the Dana rear rather than spend $$$ on an 8 3/4. Shock loads and high torque, and or poor gear setup will kill ANY rear eventually. That is why they sell pro gears.


8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
Re: Mark Williams 8-3/4 caps worth it? [Re: DoctorDiff] #2418443
12/14/17 01:24 PM
12/14/17 01:24 PM
Joined: Oct 2003
Posts: 11,678
W. Kentucky
justinp61 Offline
I Live Here
justinp61  Offline
I Live Here

Joined: Oct 2003
Posts: 11,678
W. Kentucky
Originally Posted By DoctorDiff
FWIW, I sell a new, super duty nodular iron 489 case with forged steel (counter-sunk allen bolt style) caps, and billet steel adjusters for $300.

You will spend more than that to put MW caps on a used case.


If I were going to run an 8 3/4 hard this is what I'd run. My 408 broke the 8 3/4 in my Dart on the second pass it hooked up. The transmission had to come out and apart along with rebuilding rear. I sold the rear end complete after I went through it and ordered a new S-60 from Strange.

Looking back I wish I'd been patient and found a deal on a used 9" aluminum center section and bought a new housing and axles.

Re: Mark Williams 8-3/4 caps worth it? [Re: Neil] #2418743
12/14/17 11:16 PM
12/14/17 11:16 PM
Joined: Oct 2007
Posts: 472
Minnesota, USA
humpty Offline
mopar
humpty  Offline
mopar

Joined: Oct 2007
Posts: 472
Minnesota, USA
Mine has survived 200+ passes with stock caps, 35 spline spool dead hooking radials with a transbrake and no issues so far. No bracing either. This while working through traction issues so it took lots of abuse. I do however plan to upgrade to Dr. Diff’s 489 nodular case with forged caps this winter as I was starting to get a little concerned about the caps.

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