I lost the set up specs for an Auburn 3-series posi unit for, 26 splines. Also a friend sold me a 3.42:1 ring and pinion from a 1999 6 speed Z28. The gears fit. Does anyone have the factory set up specs for this combination. Any help would be greatly appreciated.

 

the back lash and pinion depth should be on the gear set. it's differant with every gear set made. not sure what you lost? the torque specs shouldn't be hard to find in most manuals.

------------------
-=ICON MOTORSPORTS=-

 

This is from drive train direct.com

Assembly Specifications:

Cover Bolt Ft. Lbs. 20
Pinion Brg. Preload In. Lbs 24-32
Pinion Brg. Preload In. Lbs 8-12 Used
Ring Gear Backlash .005-.009
Ring Gear Bolt to case Ft. Lbs. 90
Side Brg. Caps Ft. Lbs. 60

I hope this helps

 

Thanks for the information. I now have an '88 Camaro sport coupe with a throttle body FI 305. I also have a 383 stroker that will soon be in it. The current rear end has 2.77:1 rear gears. Does anyone know if the axle has 26 or 28 splines? Any info will be greatly appreciated.

 

82-87 is 26 splines and 88 and up is 28 splines

------------------
92 Z28 5.7 TPI AUTO 105k factory motor and trans.

SLP headers and runners, B&M 2400 stall, shift kit,LCA brackets, EBACH spring kit, NITTO'S, NOS

best 60ft 1.87 1/4 12.48 @ 110.81

 

If you have 2.77's then you have the diferent rear. It's not a ten bolt, it's a 9 bolt which I have heard is a pain to get gears for.

------------------
88 firebird formula
350 Vortec TBI
214int/224exh, .471int/.491exh
Edelbrock headers
SIX-speed
Eats LS1's with a 2.73 open rear and 2 1/4 stock catback

My Formula

 

'88 is s transition year on the axles. Some of 'em got the 28 splines...some 26. The only way to be sure is to open up the rear-end, pull the c-clip, slide the axle back a bit, turn the wheel and count splines, or just totally remove the axle (you've almost done it anyway.).

-Mark W.
'88 SC Camaro w/ 305 TBI