Join Date: Feb 2009
Location: Largo, FL 33774
I do not have Belltech springs, but I would go with the 2/2 inch parts. You will get about 2 inches of actual drop on the Roadmaster. The cars do not look good with the rear sitting lower than the front. The measurement for "drop" purposes is measured from the wheel opening to the top of the rim before and after springs are added. You do not see the full travel at the bump stop. When you are done installing the new springs, there are a few things you need to address. When you need to change a rear tire, or just jack the rear for any reason, the springs will fall out of the rear if you do not weld a 3 to 4 inch piece of exhaust tubing to the upper spring perch. It is also advisable to tiewrap the springs to the lower spring perch to keep them from misaligning. In the front, for every 1/2 inch of measured drop, you must remove 0.030 inches of shims from both the front and rear upper arm stacks, to compensate for negative camber. If you do not remove the shims, you will experience extreme uneven tire wear on the inside of the tires. You should also check you toe, although it should not change much, if at all.
1991 OCC 461 (.030 over 454) BBC, 3.23 posi, flash to pass, drop spindles & springs, Impala rims, Hydroboost, Recaros, MOMO/wood SW w/QR, custom wood shift knob, Pioneer DEH P77DH
1992 OCC now with 5.7 tbi, DEH P77DH
For a parts list, check https://www.impalassforum.com/vBulle...ion-parts.html