Yes it does. It's called a limited slip differential. Posi would refer to the Chevy brand rear end. No you don't have posi. Yes you have a LSD.
I have a 1987 Firebird Pro/Am with a posi rear and V8. It came from the dealer that way. Totally original.
A posi rear end (positive traction) drives both rear wheels.a posi rear end is when both rear tires spin instead of just one
get a posi traction rear end and swap it out.
You buy a posi-trac rear differential.
Posi was offered as an option.
If its a z28, then yes. The base models did not include the posi rear end
First look at the manufacturing date on the rear of the driver's door; example 7/87 you need that to follow the motor swap. Turbo Before 4/87 1984-1986 Turbo After 5/87 1987-1989 Turbo NoN-Turbo Before 3/87 1984-1987 Non Turbo NoN-Turbo After 4/87 1987-1989 Non Turbo
The 3.73 rear end in a 1998 Chevy Silverado 1500 does not automatically mean it is a posi-traction (posi) differential. Posi-traction refers to a limited-slip differential that allows both rear wheels to spin together for improved traction. You would need to confirm with the specific vehicle's build options or VIN to determine if it has a posi rear end.
its a posi tract.
lame rear
Yes
you will need to use 90 wt oil. if it has a posi,add a posi additive.