I am buying gears and thoughy I might as well go ahead with the posi will this eaton posi work?
362-19599-010 87-Up Car/Truck, 28-Spline Axle, 7.625'' Ring Gear, 3.23-Up Gear Ratio
or is it this one....
362-19559-010 89-Up Car/Truck, 30-Spline Axle, 8.50'' Ring Gear, 2.76-Up Gear Ratio | More Details
also I just purchased a turbo 350 with the drive shaft dont know if that will have an effect on witch one to get but i just need help to decide witch one will work
Thanks,
Chris

 

It would be the first, given 2 conditions:

1. You have 28-spline axles, or buy them at the same time; and
2. You have 3.23 gears or higher, or are installing them at the same time.

There's no way to know which axle splines you will have in a 89 car. Odds seem to be about 4 to 1 that they will be 26-spline. But the only way to know for sure is to take one out and count them.

In no case will the 8½" unit fit your car.

It doesn't care what trans you have.

 

Thanks yes the turbo 350 and driveshaft are going in and im getting 3:73 gears also snice im putting a new trans in i was wondering what kind of tourqe converter to put in and what kinda rpm stall
Thanks
Chris

 

Well, a 350/400/Glide converter (duh), and whatever stall RPM your motor needs..... dyno it; get one that stalls 200-500 RPM below its torque peak; shift at the RPM such that after it has shifted into the next gear, the engine RPM is at the torque peak.

 

Hp Tq
170@4400 255@2400
That was the factory rating and I know its 15 years old so its not gonna have what it used to also I have flowmaster mufflers and a Open Element Sry if im getting annoying lol I just want to make sure I get this all right So a 2200 rpm stall? I have to go to work ill be back at 12 and check back up on this and search around