Which one seems to work the best on a 1989 GTA with 245-50-16s on front and 255-60-16 on the rear. I don't want to get so low that I have problems but I want to get as low as I can.

 

i JUST bought the sportlines...havent put em in yet though, tee hee

 

i have the prokit. dropped it about an inch all around. sportlines can drop it about 2 inches in some cases. too low for me.

 

love the looks of the sportlines, but pretty low for a daily driver....(my old 84Z28)

 

How much can you expect each kit to drop it (sportline vs prokit) I have a 140K mile 1989 Formula 350 WS-6. I am putting 245-50-16's on the front and 255-50-16 on the rear. Factory 16X8 GTA wheels.

 

before i put my springs on i measured from the ground thru the centerline of the wheel to the fender to make sure the springs weren't sagging and the new springs would actually lower it. so if you have sagging springs, it may not lower it at all or could also raise it.