mw66nova

iTrader: (13)

well, as alot of you know,i broke the PowerTrax lockright locker. through a number of posts, we determined it was the older design that was a bit weaker. we aslo determined that even though i had violent wheel hop on the pass i broke the locker on, that the main reason for failure was flex. i am on a budget so here is the idea:

go with the aluminum cover with the support screw to eliminate flex: $160
weld up the axle tubes to the diff housing: $free
28 spline moser axles :$235 *(would this really be worth it? should i find some factory 28 spline axles and call it a day?)
and i'll set aside $400 for a posi, but i don't think i'll need that much.
total cost for beefing rear: about $800
it already has a good set of richmond gears setup by an experienced gear setter-upper.

am i missing anything from my list? these are things that i can add one by one (well, the axles and posi will need to go in together, cause of the higher spline count) can you think of anything else that i will need?

along with these things, i plan to upgrade the rear suspension with tubular lca's and a better torque arm. (can someone sell me on a TA?) i believe that this will decrease my wheel hop problems and increase the life of the little rear. with all of this, i should be good well into the 11 second range and not have to worry about breaking something, including the bank for the high priced 9" or 12bolt.

mw66nova

iTrader: (13)

should i even worry about upgrading to the larger spline count axles or will the 26 spline be ok? if i did stick with the 26 spline, would going to the moser axles be a wise deal?

IROC-Z28_CAMARO

iTrader: (4)

I would upgrade the axles to the moser pieces. The stock ones have the same amount of splines but they are old and not nearly as strong as aftermarket pieces. As for the girdle that would be a good choice.

Actually now that I think of it I think jegs sells one with these axle braces or something.

HalfInchWrench

That is a lot of cash to drop on a 10 bolt. Getting close to the price of a 12 bolt or 9"

The weak point is the tiny ring and pinion. It just isn't big enough to place some nice meaty gear teeth. I don't think anything else helps including axles, stud kits or covers.

Cheapest thing you could do right now is buy a complete rear end. 4th gen might be a ittle stronger but not much. That would tie you over til you can get a 9" or 12 bolt.

blacksheep-1

http://reiderracing.com/

IMO, offload the ratchet, it's hard on the rearend axles, unit, gears, it's hard on all of it.

GTA matt

iTrader: (1)

In my personal experience, I have seen many more axles break then the gears. I beefed up my 10 bolt with all good stuff, moser axles/gears, cover, and stronger posi unit. I can now launch on it with confidence, knowing that the rear won't break. I was experiencing more violent wheelhop then I think anyone else has ever had earlier this year when i was still figuring out my suspension setup and never had a problem.

Unless you are planning on laying down some SERIOUS HP, the 10 bolt will hold up fine.

mw66nova

iTrader: (13)

with the price of a 9" being in the $2500+ range, i think that the $800 to totally beef my rear up with would be saving me plenty of money, and should handle the power without problems.

blacksheep, you've listed that link twice now, and i have been through it pretty heavily, but i don't see prices. can you tell me where the price list is for that site?

what's the best 60' you guys have gotten outta the 7.5's? mine so far is 1.82

Rancid87

I have hit 1.78 60' times with a factory auburn posi purchased used for $40, superior 28 spline axles, richmond gears with a solid pinion spacer, and welded axle tubes. I also drive the car every day and it has yet to let me down.

AlkyIROC

Aftermarket 28 spline axles are much stronger than factory 28 spline axles.

You should also pick up the Raytech solid pinion spacer.

I was running 1.6x 60' times with my old beefed up 10 bolt. I only switched to a 9" when I installed a transbrake.

mw66nova

iTrader: (13)

i'll have to ask my gear setter-upper (father) if he put in a solid pinion spacer. i'm sure he used whatever install kit recommended by Richmond.

what about the aftermarket 26 splines? or would it be silly to buy aftermarket without going to the higher count spline axles? i guess it depends on what i come across for a posi unit.

3.8TransAM

If u plan on beating it and are adding any new components, I would at a minimum upgrade to the 28 spline factory axles. that one is too cheap to ignore, especially if you are ordering new parts anyhow.

I did the same thing to my rearend as u did.(was a 91 28 spline already) Only difference is I dont have the reinforced cover(which i would lke to get).

Seems silly if your spending any money on a 7.5er to not upgrade to even the best factory offering.

From my experience and other friends vehicles, they seem to let go in the 1.6x range on a regular basis. Moreso with slick and a stick obviously than a auto setup.

Properly built and setup should cover you to that range or so. there are quite a few people getting some seriou times out of them no doubt.

later
Jeremy

AlkyIROC

That would probably be a standard crush sleeve.

mw66nova

iTrader: (13)

can you point me in the direction for where to purchase this solid pinion sleeve?

RB83L69

http://www.drivetrainspecialists.com...s.php?catid=73 Search the page for "spacer".... you'll find the ring gear spacer, and the solid spacer to replace the crush sleeve

mw66nova

iTrader: (13)

thanks RB! i'll look into that when i go to rebuild with posi, etc.

another question for ya:
what is the dimentional difference between the pre-88 housing and the post-88 housing? this is when they upgraded to the "stronger" 7 5/8" ring gear. is everything the same, and they just changed the carrier and ring/pinion? cause i have the 7 1/2" and i want to know if the ring gear i have will bolt onto a new 28spline posi from auburn or the like.

90-irocdx3

iTrader: (4)

what kind of horsepower will the rear end hold to?

D's89IROCZ

It was written in GMHTP ....Moser claimed 450 hp with their axles .... and all the reinforceing stuff you can do

AlkyIROC

7-1/2" and 7-5/8 gear sets are interchangable on all the 7.5" diffs parts. Both gear sets will bolt to the posi. GM only increased the total dimension slightly, not the mounting size.

mw66nova

iTrader: (13)

excellent! thanks stephen! that's EXACTLY what i thought, just needed to hear it from someone else!