First thing to break in these GM 7.5 rear end? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 01-28-2014, 05:34 PM
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First thing to break in these GM 7.5 rear end?

what is the first thing to break in these 7.5 rears, the ring gear or the pinon. i'm souping up a monte with one of these rears and have just bought a power trax posi for it but haven't put it in. do you think i sould replace the axles to or waste of money. i put a posi in because this car was so dangeroue in curves, wanted to spin real easy.

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Old 01-28-2014, 06:18 PM
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Old 01-28-2014, 06:24 PM
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Those axles break with regularity
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Old 01-28-2014, 07:13 PM
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There are many things that break in the 7.5 rear ends. I've seen the ring and pinion break, differential gears and axles. It's just a light weight rear end that was not designed for high performance use. I would recommend saving some money for a Quick Performance 9 inch Ford housing and axle package and then get a good used chunk to go in it.
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Old 01-29-2014, 07:16 AM
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tires spin or car?

Quote:
Originally Posted by rumpfox View Post
what is the first thing to break in these 7.5 rears, the ring gear or the pinon. i'm souping up a monte with one of these rears and have just bought a power trax posi for it but haven't put it in. do you think i sould replace the axles to or waste of money. i put a posi in because this car was so dangeroue in curves, wanted to spin real easy.
posi rear ends do not help cornering,its the opposite. You need posi for acceleration,, but a posi tends to push in corners until such time as it breaks traction and causes over steer
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Old 01-29-2014, 12:08 PM
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that mekes it fun and perdictable thats why cup cars use lockers not posis.
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Old 01-29-2014, 12:14 PM
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i mispoke it's a locker i installed not a posi.
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Old 01-30-2014, 11:08 AM
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I noticed my 2 carrier doesn´t need to have the ring gear pressed on,
very little flange for it, the bolts are doing all the work.
Two things that can be done is swap to studs on the diff bearings and
get a diff cover with bearing supports.


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Old 01-30-2014, 01:24 PM
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i've got the support but if you put studs in won't n it tighten up the bearing clearance. i know it will on the mains in a eng. with bad, bad results
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Old 01-30-2014, 01:43 PM
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Quote:
Originally Posted by rumpfox View Post
i've got the support but if you put studs in won't n it tighten up the bearing clearance. i know it will on the mains in a eng. with bad, bad results
Dunno it´s a fix recommended by Randy of Randy´s Ring & Pinion.
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Old 01-30-2014, 01:55 PM
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i'll give randy a call and get his avice.
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Old 01-30-2014, 02:14 PM
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This is the book I got the info from,
Differentials: Identification, Restoration & Repair Differentials: Identification, Restoration & Repair
- 2nd Edition Covers basic differential info, differential specifics, tips & how to's, and DIY rebuilding,
Jim Allen & Randy Lyman
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Old 01-30-2014, 03:19 PM
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thanks for the info. i'll give it a read
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Old 01-30-2014, 03:35 PM
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this monte will never see slicks or even stickey tires. i just want it to be trustworthy behind a 400 hp eng. one guy told me the tranny would break long before the rear. 200-r4 with a g.n. converter. i don't know anything about the internals. the guy i bought it fromm swears i'ts got a 700 in it. he also said the crank in the eng. wasn't broke. said it couldn't run like that. i put 400 miles on it before i decided to crate motor it.bam crank came out in 2 pieces.rebuilt g.m. eng. with only 31,000 miles pur. over 3 years ago. naturly no refund or help on the purchase price of ten bills.
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Old 01-30-2014, 04:14 PM
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10 Gs for a stock engine?
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