are there any markings on the rear end i can use 2 identify what kinda ratio it is and if its posi or not. (such as the stampings on the outside)

thanx

 

yeah there is and they're hard to find and you have to referance them to see what you have and i'm not sure where thay are. best and easiest thing to do is pull the cover and look at the carrier and the ratio stamped on the gear set.

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ICON Motorsports
1st & 3rd

 

If you just need to know the ratio, depending if you have posi or not, you can jack it up with the transmission in neutral and count how many driveshaft revolutions you have per rear axle revolution. A working conventional Posi is easier, since both rear wheels will turn together. With an open rear end or Eaton Locker, leave one wheel on the ground and divide the rear wheel turns by 2. You'll get a more accurate figure counting how many driveshaft revs per 10 wheel revs and you can confirm the exact ratio if you guess the number of pinion and ring gear teeth. For example, a "3.73" is actually 41:11, or 3.727272etc. It's easier if you have a helper to count the axle turns while you count the driveshaft turns. Of course if you have a manual, you can try decoding the stuff stamped on the axle, but it's not easy to read. You'll find it on the front passenger side of the axle tube. That's if someone hasn't changed the axle or gears, of course.

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1985 Yellow IROC-Z 5.0 HO, T-5 3.73 Posi, 4 wheel disks
PFCM pads, GTA wheels, Koni yellows, B&M Ripper, Dynomax

 

Look on the passenger side rear axle and therell be a code there....these codes can be identified in the Haynes manual...email me your code if ya dont have the maual and Ill tell ya what it is.

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1991 Firebird Formula
305 TPI
Auto
K&N Filter
Grant GT Steering Wheel
5% Rear tint
Pontiac Windshield Decal
No real mods yet!

Former owner of an 88 2.8 Firebird....RIP

 

on the front side,2/3rds toward center

 

thanx guyz, and i got the haynes manual, so thats what ill look 4, (i really wasn't looking forward to counting the revolutions)

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Stock 2.8 MPFI auto w/ Flowmaster 40, More to come......
New Pioneer Head Unit
2x 10" Thruster Subs powered by 300 Watt Jensen amp
More to come..... (hey, i dont got a job yet)