Mark Williams Billet Caps for 8 3/4
#1887315
08/08/15 03:31 AM
08/08/15 03:31 AM
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Joined: Feb 2005
Posts: 550 Lakewood, Colorado
runnerrt
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mopar
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mopar
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Posts: 550
Lakewood, Colorado
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I am wondering if a set of Mark Williams billet caps and spanners would be overkill or not. I am going to be going through a 8 3/4 rear to put in my 69 Bee. I am going from a 4.56 behind my low 13 second at altitude 383 4 spd car, to a 3.91 and a 500 stroker by spring. I have everthing to do it ( new Detroit Tru Track, bearings, ordering a Dr. Diff yoke) and was wondering if these caps and spanners might be in my best interest while its apart ? I don't have the money to go Dana and would like this to hold up. In all honesty it will see may ten to fifteen passes a year.
Last edited by runnerrt; 08/08/15 12:56 PM.
1969 Super Bee High School car I got back
2004 Ram 2500
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Re: Mark Williams Billet Caps for 8 3/4
[Re: runnerrt]
#1887825
08/09/15 12:10 AM
08/09/15 12:10 AM
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Joined: Feb 2005
Posts: 550 Lakewood, Colorado
runnerrt
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mopar
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Lakewood, Colorado
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I would be in this less than $1000 with the caps and machine work included. I would love a Dana and I am not ruling one out, just can't swing it now. Sounds like anything would help.
1969 Super Bee High School car I got back
2004 Ram 2500
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Re: Mark Williams Billet Caps for 8 3/4
[Re: J_BODY]
#1888200
08/09/15 07:12 PM
08/09/15 07:12 PM
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Joined: Jan 2008
Posts: 795 Glendale Az
Darryls-Demon
super stock
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super stock
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Posts: 795
Glendale Az
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Jump on Craigslist and find a Dana 60 out of a pickup [I paid 80 dollars for one complete] You should be able to put one together for around 1200.00 dollars.
Last edited by Darryls-Demon; 08/09/15 07:13 PM.
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Re: Mark Williams Billet Caps for 8 3/4
[Re: runnerrt]
#1888375
08/09/15 10:43 PM
08/09/15 10:43 PM
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Joined: Jan 2003
Posts: 5,486 SoCal
Brian Hafliger
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SoCal
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I am wondering if a set of Mark Williams billet caps and spanners would be overkill or not. I am going to be going through a 8 3/4 rear to put in my 69 Bee. I am going from a 4.56 behind my low 13 second at altitude 383 4 spd car, to a 3.91 and a 500 stroker by spring. I have everthing to do it ( new Detroit Tru Track, bearings, ordering a Dr. Diff yoke) and was wondering if these caps and spanners might be in my best interest while its apart ? I don't have the money to go Dana and would like this to hold up. In all honesty it will see may ten to fifteen passes a year. If you hook it good at the track with slicks, it will break someday but it will take a while. The ring gear (or pinion, or both) will develop cracks and eventually break. If you don't hook it hard, and mostly street drive it then it's not as bad....after saying all that I agree the Dana 60 is the best and really should be what you use. I use one in my duster and I would not use anything else personally. Brian
Brian Hafliger
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Re: Mark Williams Billet Caps for 8 3/4
[Re: runnerrt]
#1888492
08/10/15 12:30 AM
08/10/15 12:30 AM
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Joined: Nov 2009
Posts: 3,082 St. Paul , Mn.
tubtar
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St. Paul , Mn.
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I think this issue has been well covered , but there are differences of opinion. The cap is a band aid. If you brace the housing and add the cap , there isn't much more to do.
Making sure it is well set up and using quality parts goes without saying. With a stick and a lot of weight ( 3000 or more ) I don't like their odds. With an auto , a light car and foot braking , it may last forever. I believe that weight is a big issue for them , but a stick and the shock they impose on the driveline just compounds that. If it hooks hard , I really don't like their odds. I am in the 9" camp , but the Dana is also a decent choice.
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Re: Mark Williams Billet Caps for 8 3/4
[Re: runnerrt]
#1888501
08/10/15 12:51 AM
08/10/15 12:51 AM
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Joined: Jan 2003
Posts: 8,171 Plymouth, MI
Blusmbl
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Plymouth, MI
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Speaking from experience, I broke multiple 8 3/4 rearends with a mild 440 and a 4 speed in my old '68 Charger R/T. Axles, yoke, a pinion in half, etc. If you launch it hard at all, you're going to break parts. Sell what you have and use part of the proceeds to finance a Dana or 9".
The only other option is to never put drag radials or slicks on it, and slip the clutch on launches.
Last edited by Blusmbl; 08/10/15 12:51 AM.
'18 Ford Raptor, random motorcycles, 1968 Plymouth Fury III - 11.37 @ 118
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Re: Mark Williams Billet Caps for 8 3/4
[Re: runnerrt]
#1888868
08/10/15 04:02 PM
08/10/15 04:02 PM
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Joined: Jul 2006
Posts: 4,319 Puyallup, WA
StealthWedge67
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I'm a guy that generally believes 8-3/4's can live if you prep them right, but @ 500 cubes with a 4-speed and B-Body weight, my sense is that you're way past the limit of an 8-3/4. I'm running MW steel maincaps in my 742 8-3/4; along with a Detroit Locker differential, Dr. Diff axles, and a Moser Backbrace. A couple of years in, it seems fine and has held up to my abuse, but that's in an automatic car with 452 cubes, and my 67 probably weighs a bit less than a 69 Dodge. Frankly, I'm surprised Cass sold you the TruTrac (Assuming you talked with him and he knew where it was going??). I would think your only chances for survival involve a Spool, a hefty backbrace, and the steel caps. At that point, the gearset itself becomes the weak link.
Now, all of this is assuming the car hooks at the racetrack, and you're stepping fully into it. on the street with the hardware you've described, you'll likely never see enough traction to break it. If you're going to the track, my advice is: Have a trailer ready for the ride home.
LemonWedge - Street heavy / Strip ready - 11.07 @ 120
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Re: Mark Williams Billet Caps for 8 3/4
[Re: runnerrt]
#1889084
08/10/15 09:50 PM
08/10/15 09:50 PM
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Joined: Nov 2010
Posts: 1,397 Carson City, Nevada
Biginchmopar
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Carson City, Nevada
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Waste of time IMO. I've seen way to many 8 3/4's break. Save your money do it right once with a Dana 60.
Trust me, the 8 3/4 will fail.
Last edited by Biginchmopar; 08/10/15 09:51 PM.
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Re: Mark Williams Billet Caps for 8 3/4
[Re: runnerrt]
#1889380
08/11/15 11:24 AM
08/11/15 11:24 AM
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Joined: Oct 2003
Posts: 7,506 Az
Crizila
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There is an alternative to going with a Dana. About as strong. A lot less $. Bone yards are full of them.
Fastest 300
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Re: Mark Williams Billet Caps for 8 3/4
[Re: runnerrt]
#1889393
08/11/15 11:49 AM
08/11/15 11:49 AM
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Joined: Jan 2003
Posts: 13,375 Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
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Marion, South Carolina [><]
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I'd sell your 8.75 and build a Dana 60 starting w/ a junkyard truck rear. My dad did exactly that w/ his 440-6 4 speed '69 road runner. After selling his 3.55 suregrip 8.75, he was only a couple hundred bucks short of breaking even on a 35 spline, 3.54 gear Powerlock diff. Dana 60.
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: Mark Williams Billet Caps for 8 3/4
[Re: runnerrt]
#1890152
08/12/15 11:21 AM
08/12/15 11:21 AM
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Joined: Jan 2003
Posts: 1,237 North Central, Indiana
Roughbird72
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pro stock
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Posts: 1,237
North Central, Indiana
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I'm soon to be in the same boat. Just curious, what's the best donor vehicle to get a 60 housing from? Looked at Moser's website & a complete 60 starts at about $2200. I've got more time than money so building one myself may be the way to go.
72 Plymouth Roadrunner 11.08@123.25
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Re: Mark Williams Billet Caps for 8 3/4
[Re: runnerrt]
#1890166
08/12/15 11:33 AM
08/12/15 11:33 AM
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Joined: Jan 2003
Posts: 13,375 Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,375
Marion, South Carolina [><]
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Mine came from mid '70s dodge and ford trucks I believe. They came in lots of different vehicles over a wide range of year models. Got lucky w/ the one from the dodge truck...it had 3.54 gears and the stronger powerlock differential. Install new bearings, cut the housing and weld on the pass. car ends, new 35 spline axles and 35 spline side gears from Dr. Diff, and put it in the car.
The new rears have definitely gotten more expensive. Back in 2003 or 2004, I paid $1750 for the Moser 60 that's in my cuda. No brakes, 35 spline spool and axles w/ long studs, 4.10 street gear, billet 1350 yoke, chrome cover. Been beating the snout out of it ever since and only took the cover off one time to change the fluid after 10 years.
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: Mark Williams Billet Caps for 8 3/4
[Re: runnerrt]
#1890176
08/12/15 11:40 AM
08/12/15 11:40 AM
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Joined: Jan 2003
Posts: 1,237 North Central, Indiana
Roughbird72
pro stock
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pro stock
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North Central, Indiana
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I was wondering what differential is best for a street/strip car. A complete 60 with a Truetrac or Detroit Loocker will cost me $2890 from Moser ... i think i could do one myself for less.
72 Plymouth Roadrunner 11.08@123.25
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