Re: Mark Williams 8-3/4 caps worth it?
[Re: Neil]
#2417896
12/13/17 01:05 PM
12/13/17 01:05 PM
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Joined: Jan 2003
Posts: 13,357 Marion, South Carolina [><]
an8sec70cuda
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I Live Here
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Marion, South Carolina [><]
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It depends...what's the application?
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 8-3/4 caps worth it?
[Re: Neil]
#2417912
12/13/17 01:37 PM
12/13/17 01:37 PM
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Joined: Oct 2007
Posts: 4,206 New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,206
New York
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Remember, this is a good time to analyze whether you're ever going to swap in a 9" or Dana. If yes, any money spent keeps your 8-3/4" going but subtracts from your upgrade fund.
Boffin Emeritus
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Re: Mark Williams 8-3/4 caps worth it?
[Re: Neil]
#2417922
12/13/17 01:52 PM
12/13/17 01:52 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
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Posts: 52,972
Romeo MI
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Understand that the caps need to be machined to fit your pig so they are not a bolt on out of the box
Last edited by MR_P_BODY; 12/13/17 01:53 PM.
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Re: Mark Williams 8-3/4 caps worth it?
[Re: an8sec70cuda]
#2417926
12/13/17 02:01 PM
12/13/17 02:01 PM
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Joined: Jan 2003
Posts: 20,501 Eagle, Idaho
Neil
OP
The Doctor is in.
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OP
The Doctor is in.
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Posts: 20,501
Eagle, Idaho
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It depends...what's the application? W2 408 in a full street trim 70 Dart. Mostly street use. No transbrake. 235/60-15 drag radials.
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Re: Mark Williams 8-3/4 caps worth it?
[Re: Neil]
#2417942
12/13/17 02:24 PM
12/13/17 02:24 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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Being in street trim you need them or a better diff.. I have a lite car with the alum diff in it and its doing great.. in my Rampage I run a 9" with a 416 and W-2s.. I like the take out diffs and wont change
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Re: Mark Williams 8-3/4 caps worth it?
[Re: Neil]
#2417950
12/13/17 02:30 PM
12/13/17 02:30 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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It depends...what's the application? W2 408 in a full street trim 70 Dart. Mostly street use. No transbrake. 235/60-15 drag radials. I did OK w/ MW caps on both sides (some people only use one on the right side, I think), a 742 case w/ a Power-Lock (clutch-type) sure-grip, and a small back-brace for the housing. It SOUNDS like you'd be OK, but nothings a sure thing with an 8.75", IMO.
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Re: Mark Williams 8-3/4 caps worth it?
[Re: Neil]
#2417971
12/13/17 03:04 PM
12/13/17 03:04 PM
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Joined: Jul 2004
Posts: 19,317 State of confusion
Thumperdart
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I Live Here
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State of confusion
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It depends...what's the application? W2 408 in a full street trim 70 Dart. Mostly street use. No transbrake. 235/60-15 drag radials. Been in the 9's and 1.3 60 ft. for years from 3200 lbs. now down to about 3050 w/a 470 BB stroker and a stock capped 742 but recently went to the Nodular from Dr. Diff w/forged caps so it should out last me, but I don't race much anymore............
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.....
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Re: Mark Williams 8-3/4 caps worth it?
[Re: BradH]
#2417991
12/13/17 04:05 PM
12/13/17 04:05 PM
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Joined: Jan 2003
Posts: 13,357 Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,357
Marion, South Carolina [><]
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It depends...what's the application? W2 408 in a full street trim 70 Dart. Mostly street use. No transbrake. 235/60-15 drag radials. I did OK w/ MW caps on both sides (some people only use one on the right side, I think), a 742 case w/ a Power-Lock (clutch-type) sure-grip, and a small back-brace for the housing. It SOUNDS like you'd be OK, but nothings a sure thing with an 8.75", IMO. Mostly street use, I'd say you should be OK w/ the 8.75. IMO, the caps are a waste. If it has enough steam to go 10s or so, I think you should consider upgrading the whole rear.
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 8-3/4 caps worth it?
[Re: Neil]
#2418007
12/13/17 04:25 PM
12/13/17 04:25 PM
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Joined: Aug 2003
Posts: 43,125 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,125
Bend,OR USA
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I've seen more than two stock cast steel caps break on 8 3/4, I would put at least one on the driver side The stock 8 3/4 center section are cast steel so adding a billet steel cap will stop breaking the stock cast caps How much weight and how fast has your car gone at the track? Spinning and hooking along with medium to heavy weight is what causes the stock caps to break
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Mark Williams 8-3/4 caps worth it?
[Re: Neil]
#2418022
12/13/17 04:39 PM
12/13/17 04:39 PM
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Joined: Dec 2003
Posts: 22,696 Bitopia
jcc
If you can't dazzle em with diamonds..
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If you can't dazzle em with diamonds..
Joined: Dec 2003
Posts: 22,696
Bitopia
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I ran across people selling Mark Willaims 8-3/4 main caps on Ebay and had no idea such a thing existed. Are these a worthwhile purchase, or save my money? Every engineered item has a weak link. Making the weakest link stronger (in this case I believe consensus is, that I agree with is the DS Cap), which means the next link is now the issue, and so on. Does this billet cap make an 8.75 a more robust rear, yes, is it robust enough for you, don't know, at some higher power level will it fail, absolutely, have I made this two sided cap upgrade to all my steel 8.75'x, yes, would I do it again, yes.
Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.
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Re: Mark Williams 8-3/4 caps worth it?
[Re: Neil]
#2418025
12/13/17 04:42 PM
12/13/17 04:42 PM
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Joined: Jul 2006
Posts: 4,319 Puyallup, WA
StealthWedge67
master
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master
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Puyallup, WA
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I went the direction of adding a MW steel cap on my 8-3/4 a couple of years ago. Be aware, as Mike noted above, that they are not a bolt on. They need to be machined to fit your pig, and that process cost me more than the cap did. It's notable that on the nodular Iron units, they upgrade to steel caps from the get-go.
I don't throw a lot of power at mine, but I do hit it with a lot of weight (3800+). I see a lot of 10-second cars running them, and believe they can be a decent option if we'll prepped. I'm of the belief that a 742 8-3/4 with a back-brace, spool, steel caps, and good axles is more durable than many here will have you believe.
LemonWedge - Street heavy / Strip ready - 11.07 @ 120
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Re: Mark Williams 8-3/4 caps worth it?
[Re: StealthWedge67]
#2418034
12/13/17 04:56 PM
12/13/17 04:56 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
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Master
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Romeo MI
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I will say that if you put the cap/caps on it that you should put a back brace on the diff to keep you from bending the axle tubes(try to make them as long as you canto support the tubes)
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Re: Mark Williams 8-3/4 caps worth it?
[Re: Neil]
#2418041
12/13/17 05:08 PM
12/13/17 05:08 PM
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Joined: Jan 2003
Posts: 13,357 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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So by the time you buy the MW main caps and have them machined to fit, you could have bought a junkyard Dana 60 and had it narrowed to fit your car. The gear, spool, and axles cost the same for both rears. I just don't see the point.
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 8-3/4 caps worth it?
[Re: an8sec70cuda]
#2418065
12/13/17 05:48 PM
12/13/17 05:48 PM
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Joined: Jul 2006
Posts: 4,319 Puyallup, WA
StealthWedge67
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So by the time you buy the MW main caps and have them machined to fit, you could have bought a junkyard Dana 60 and had it narrowed to fit your car. The gear, spool, and axles cost the same for both rears. I just don't see the point. So you can buy a Dana and have it narrowed for $200-..... I doubt it. Nobody is arguing that a Dana isn't a good option, it is. but I think you're over simplifying the Dana swap by a pretty large margin. Especially if you already have the 8-3/4. Perches, brakes, brake lines, gearset, spool or sure-grip diff., yoke / driveline work, narrowing..... these things all add up and aren't free when doing a swap. If you already have an 8-3/4 with the correct gearing that fits your car, you can have that unit prepped to survive at the drag strip for around $500. I'm guessing that's around the cost of the junkyard Dana you are starting with. Not to mention you can pick away at it and not have to come up with all of that $$$ at once. Each option has its pros & cons. Having an 8-3/4 under you car isn't a kiss of death like many will make it out to be.
LemonWedge - Street heavy / Strip ready - 11.07 @ 120
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