I just installed a rear diff from a 2000 SS. My question is, why is it sitting 1/2" off, towards the pass. side?

 

probably was before too. Check the condition of the panhard bar.

If its straight and undamaged, you need a adjustable panhard bar to center the axle

 

I have Spohn panhard bar and LCA's that I bought from one of the mods here. It drives perfectly straight and all, but you can tell it is off center and measurements confirm it.

 

My 3rd gen rear was off by 1/2" as well...towards the pass side.

Adj ph-rod (on car) corrected the issue.

 

99% of these cars are like this. You won't really notice it until you put your tires out to the edge of the sheetmetal.

 

Not until the tires are closer to the edges of the fenders does it really become noticeable. I was on stock springs, stock wheels with stock sized tires & only 1/2" lower than when it was brand new & mine seemed fine until I put 17"x9" wheels that had a different backspacing (from stock) on them & sat just a bit in from the edge. I got an Adjustable PHB from http://www.umiperformance.com/catalo...fombdeosckah83

 

Ok cool, those are the answers I was expecting to hear. Ok, so I won't worry about it for now, and then over winter I'll get an adjustable PHR and take care of it.

Thanks guys.

 

My car came with a 4th gen 12bolt rear. A twist on panhard bar centered it perfectly.

 

Not uncommon on the F-body because as the suspension sags or you drop the car, the rearend pushes to the driver's side. As mentioned above, the fix is an adjustable panhard bar.

- Kevin