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Re: Whats left of a 8 3/4 aluminum center
[Re: Bill_LBSR]
#1620890
05/17/14 10:29 AM
05/17/14 10:29 AM
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Joined: Sep 2007
Posts: 1,893
Spahn Ranch
RMCHRGR
top fuel
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top fuel
Joined: Sep 2007
Posts: 1,893
Spahn Ranch
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Cool, can't wait to blow mine up.
'71 Duster
'72 Challenger
'17 Ram 1500
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Re: Whats left of a 8 3/4 aluminum center
[Re: justinp61]
#1620893
05/17/14 11:21 AM
05/17/14 11:21 AM
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Joined: Sep 2007
Posts: 1,893
Spahn Ranch
RMCHRGR
top fuel
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top fuel
Joined: Sep 2007
Posts: 1,893
Spahn Ranch
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Probably not worth the expense. The aluminum cases have gone way up. I bought mine about 10-12 years ago when they first came out. I think it was around $600-700? Can't remember exactly. Mancini wants $1,100 for it now.  I have a Victory billet 7290 yoke they want $160 for. That was also way less too, maybe $100-125? Mine has an Auburn sure grip ($400? back then maybe, now about $500?) and Strange Pro Street gears, maybe $175? Plus the bearing kit and seals, usually around $125+ for Timken. I built it myself, so no labor involved for me. But, I have the T&D pinion setup tool which is really expensive, like $400. It works great though, the generic pinion depth tools are not so good. Also have the adjuster spanner from Randy's and a Miller yoke holder. I was a tech up until about a year and a half ago so I used some of the tools at work but never used the pinion tool. Hard to justify that one.
'71 Duster
'72 Challenger
'17 Ram 1500
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Re: Whats left of a 8 3/4 aluminum center
[Re: Guitar Jones]
#1620896
05/17/14 11:59 AM
05/17/14 11:59 AM
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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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Quote:
Quote:
I still have my alum center.... I have 1 question
for the OP... did both caps have full threads in them...
I know of a few that were sold that had very shallow
threads in one side or the other
Three of those bolts are through the case and the fourth is a stud. What threads are you talking about?
Where the side adjuster screw in
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Re: Whats left of a 8 3/4 aluminum center
[Re: justinp61]
#1620897
05/17/14 12:05 PM
05/17/14 12:05 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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Quote:
Just out of curiosity. How much does a fully set up aluminum center section cost? Spool, gears, a good yoke and labor.
I bought mine years ago... it was much cheaper and back
then I was working at Chrysler so I got a extra 25% off
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Re: Whats left of a 8 3/4 aluminum center
[Re: Monte_Smith]
#1620903
05/17/14 03:50 PM
05/17/14 03:50 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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Quote:
Weight and torque is what kills an 8.75. P-body could put a big block in that thing or spray the small motor and it will snap that case like a twig.
It just doesn't matter what you do to them, you can't fix the inherit flaw in the design. The gear end of the pinion is NOT SUPPORTED. The pinion flexes, comes away from the ring gear....saws teeth off and that clogs up the works and SOMETHING has to give and that is usually the case. Housing flex is NOT what kills them, it is pinion flex. Better cases, billet caps and all that other stuff is like a bandaid on a gunshot would. Not much help
As for the OP.......the ONLY thing that is going to survive in a decent HP radial car is a Dana or a 9". RADIALS BREAK CRAP. We have a chromoly housing in our radial car and bent it several times. The new housing is also chromoly, but has .250 wall axles tubes and is braced like you would for a Pro-Mod car.......2800lbs, dead hooking tire and going 1.0 60fts STRESSES parts
Monte
I'm glad you cleared that up reg 8.75", lack of strength vs limited design, in that its the design that likely caused the failure, but I suspect there is as much ring/spool deflection as there is unsupported pinion deflection, and any combination would eventually lead to the OP's sheared tooth scenario pictured. I think the back housing brace solution is a completely separate issue. The alum factor played little part in this failure IMO that I can see.
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: Whats left of a 8 3/4 aluminum center
[Re: weinerboy1]
#1620904
05/17/14 06:42 PM
05/17/14 06:42 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:
Years ago, my friend Dennis Maurer (Judy Lilly's crew chief) told me an 8 3/4 will never live with a tire larger than 10", carburated bbody. They're fine for light cars, low hp. Dick Gibbs.
where did you come up with weinerboy as a handle? never mind I don't want to know  
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Re: Whats left of a 8 3/4 aluminum center
[Re: Monte_Smith]
#1620907
05/17/14 10:32 PM
05/17/14 10:32 PM
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Joined: Oct 2003
Posts: 842
Baltimore,MD
Bill_LBSR
OP
super stock
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OP
super stock
Joined: Oct 2003
Posts: 842
Baltimore,MD
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The nitrous was progressed at the hit so the full kit wasnt even on yet when it broke.
yeh Monte hes looking for a 9" or Dana for it now.
Car doesn't have a 727 it has a powerglide in it.
LBSR
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Re: Whats left of a 8 3/4 aluminum center
[Re: Bill_LBSR]
#1620908
05/18/14 12:13 AM
05/18/14 12:13 AM
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Joined: Dec 2005
Posts: 11,608
Fulton County, PA
CMcAllister
Mr. Helpful
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Mr. Helpful
Joined: Dec 2005
Posts: 11,608
Fulton County, PA
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I'll bet the track crew was PO'd. That makes a nasty mess to clean up on a starting line. Don't ask me how I know.
If the results don't match the theory, change the theory.
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. Personally i think if you put 10 gear sets up head to head the aluminum housing would generally last longer than it's old steel counter part.... but for the investment.... definately better ways to spend your money.
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