kclivie

i would like to have some help i have a 1986 Camaro Z28 irocz i would like to know more about the rear end that this car have i took the cover off to look at the gears and they was in good shape the number on the gear were GM 14085338-13:42=5/8-120 -3 can anyone tell mewhat this means and i would like to know how you can tell if you have pos traction and what it is. thanks
kclivie

parkers Z28

I guessing 3:42 gears.
limited slip
both tires will spin when you step on the gas. but while you are driving the locker or something
will slide so only one axle is in contact with the gear this is done to make the car turn
& handle better. there is more to it than that but that's all I got

kclivie

thanks i will do more looking into to this any place i can go to get info

Injuneer

When you looked at the "carrier" that the ring gear is bolted to, did it have some springs and metal brackets inside it, as shown in this photo:

Auburn High Performance Series Differential 10 Bolt 7.5" (3.25-up)-- 28 Spline - Tick Performance

That's an Auburn limited slip unit for a GM 7.5/7.625" rear axle.

The numbers on the gears only identify the gears - not the carrier. The gears will work with either type rear. For the record the "13:42" means 42/13 = 3.23 gears. I suspect the "5/8" indicates a 7.625" diameter and the "3" means it's a 3-series carrier (for gear ratios 3.23 and numerically higher).

Put the rear wheels on some wet pavement. Floor it. If the car moves ahead with both wheels having traction, you have a "posi". If it just sits there spinning ONLY one wheel, you don't have a posi, or if you do, it's worn out.

kclivie

thanks for the info both tires will spin at the same time