Adjustable uppers a must when lowered?

[CopGn]

I dropped my car around 2". Are the adjustable upper control arms a must now to set the rear angle?

 

[Glen]

I don't know any other way to change pinion angle without drilling new holes. If you are not getting a vibration @ steady 55-65 cruise in o/d, then I would not bother.

 

[CopGn]

My concern is am I losing traction by dropping the rear end and changing the pinion angle. Anyone else?

 

[Glen]

Pinion down angle increases traction.

 

[Chuck Leeper]

Lower??

Lowering the car just helps a little in re- locating the already incorrect instant center location, to a bit more favorable point.

FWIW, The pinion angle is not a major tuning tool. It's something that helps reduce driveline bind, thus freeing up some HP to use where it's supposed to be.

There have been a bazzilion posts in ALOT of threads on this. I'd suggest a archive search, as it should give you some good info... and some "not so good"..