Ok I was thinking about going with BRM spring kit that drops 1.5". I was wondering if I NEEDED an adjustable panhard rod and cause if I didn't I'd get subframes to tighten the car up.
Thanks

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1988 IROC-Z T-Top
350 Crate engine
370ft. lb Torque STOCK
5speed Centerforce clutch

 

You do not need the adjustable panhard bar but I would consider one if you are after performance handling as opposed to just the looks of a lowered car. By lowering the car it will move the rear end over a little but nothing to be concerned about unless you are lowering the car a lot.

What I have found is the rearend of our cars may not be perfectly centered from the factory. I would measure the rearend before and after you lower the car and if it is out then I would get an adjustable bar. One other benefit of the aftermarket bars is that they are much less prone to flex under extreme cornering.

You may want to ask this question in the suspension forum.