I have a 89 rs posi rear with 2.73 gears and I am wanting to go to the 3.73 gears. Will I have any problem with the posi unit.

I would like to install them myself with same carrier and housing, but I dont have the guages. I though about just putting the shims back as the were, but am afraid of messing the gears up.

What is a good price to pay to have them installed. I can remove the rear If that is cheaper and easyer.

I know someone has done this swap. Did it make alot of sotp difference?

You will need a new posi. If you have 28 spline axles you can buy one for around 100 from www.slponline.com Oh, and it should make a heck of a sotp difference from 2.73 to 3.73.

i have a high gear alo, and im happy with it. the lower you go the worse gas milage you get right?

Yes, the lower (higher numerically) you go the better accleration and less gas mileage. From what I have heard most people dont loose a ton on gas mileage from a gear swap, but that is a large difference so you might loose a bit on mileage.

Ben

Why Would I have to change to a new posi. Cant I get a gear from summit to fit my posi. It says for a 3.08 and numerically lower carrier. This should work. The posi and axels are in the same rear.

Yes, your right. If you got the stock style gear you would need a new posi, but they make gears that you can use your posi with. I have a 9 bolt and they dont make gears like that for it so I just didnt think about that.

Ben