cobrakiller650

Hey everyone.

The most unfortunate thing happened... decided to do a donut and hit the curb and broke of the entire wheel off, disks and basically everything that holds the wheel. Because i dont know if the whole rear end got bent or not i came accross a deal which involves a 96 z28 i believe.. with 3.42 limited slip . 120 for the whole rear end if i do a trade and give him mine. So my question is, at what point does this rear end pull? do 3.23s pull harder when pushing past 100mph? or do the 3.42 offer a mid range over the power band? honestly i know little about these. if i could get ur opinion that would be helpfull. it is my daily driver, 60% freeway, 30% city drivin. 10% donuts. lol

Injuneer

You probably won't even notice the difference. It's only a 5.9% change.

xxteenobesexx

I love injuneer's straight up talk. Kudos to the admin

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cobrakiller650

thank you injuneer, should i even prgram the computer for the new gears? if the speedo is off by 10mph then im personally ok with it. But if its 5% i should be ok?. Thank you!

Injuneer

The speedo will be off by the same 5.9% (not by a fixed number of MPH). At a true 60 MPH, your speedo will be reading 63.5 MPH, and for every 1,000 miles you actually drive, the odometer will rack up 1,059 miles. I'd have the PCM corrected.

cobrakiller650

OK. One last question (ugh) i know. lol. I noticed when the wheel broke off.. the stem of the axle was up in the air. i remember stepping on it and hearing grinding noise but it didnt move. Up until now i know the rear end that im getting is possi/limited slip. Im starting to think maybe i never had possi? im confused. im gettin the rear end til tomorrow. what kind of adjustments will i have to make if my car isnt possi but the rear end im puttin in is??? thanks

FirstYrLS1Z

If your 94 Z28 A4 was still stock (OEM) in the rearend,you would have had 'posi',an Auburn unit. So adjustments shouldn't be necessary.
Only potential problem is in the 3channel/4channel realm. 94s' weren't available with 4channel ABS & TC,96s' were,so a 96 rear could be 3channel ABS or 4channel ABS & TC.

cobrakiller650

So my best bet is hopping that the 96 rear end is a 3 channel

FirstYrLS1Z

yes,if it's a 3channel,full compatability.
if it's a 4channel,your ABS light will be constantly on,you'll have brake function less ABS capability.
the 2 systems have NO compatability,different hydraulics and computor.
it's 'easy' to convert a 3channel rearend to 4channel use by swapping axles and backing plates,difficult to convert a 4channel rearend to 3channel use.

Wild Willy

Correct- 3-channel took the rear wheel speed off of the ring gear, the reluctor is in the differential housing. 4-channel has wheel speed sensors on each wheel, and was used in conjunction with traction control.

Injuneer said the same thing I was going to- you probably won't even notice much difference. But best to have the PCM reprogrammed, since the shift patterns are controlled by speed data- not just your speedometer is affected.

cobrakiller650

*UPDATED*
I just bought a 3.42 rear end from a 1995 camaro z28 w/possi i believe?. I looked at the top "looking for that sensor" and it does have it. So i think its a 3 channel . So i should be good. I got it for 450 complete rear end with calipers and everything. 200 for installation. Good right? should i have my mechanic do the oil on it also? should i get royal purple? i have heard they associate royal purple with the rear ends?? but yeah its been sitting since last sunday on my street. A full week it taking

cobrakiller650

just to make sure.. its the right one right? lol

AL SS590 M6

yeah it'll fit but be aware that you'll have to grind a small bit of aluminum out of the center part of the wheels that goes over the center hub of the axle as the older 4th gens had a slightly larger hub.

Injuneer

All 4th Gen V8 models left the factory with a limited slip ("posi" or positraction) rear axle.

$200 for an install is excessive. You can do it yourself in a couple hours. I would strip the brakes off the new one, and simply use your existing brakes. That eliminates the need for opening up the hydraulics and bleeding the system.

This is a swap procedure for a 12-bolt, just ignore the 12-bolt references, and follow the steps for removal and install:

http://www.injuneer.com/Strange12.html

cobrakiller650

I just wanted to say i finally got to drive it. ehh. Theres a slight difference when i really put my foot down but i wouldnt know more then that, scared to hit anything now.lol. Thanks Injuneer.!!! everybody for ur advice thank you!