Switch to disc in rear

Originalowner73 340duster said
I didn't consider the weight because I didn't think it would be enough to make a difference..was more worried about stopping force..but will definitely consider that in my final decision

AAndrews said
I considered this upgrade but decided against it and went with Moser 4.5 bolt circle axles, and 11x2.5" rear heavy duty finned drums. Why?? Because removing the factory drum setup and going with disks removes too much weigh from the rear and further exasperates the front to rear weight bias resulting in poorer handling characteristics.

this should not be the case at all. It is unsprung.
IF anything, the disc will weigh less and allow the car to go faster.
IF it was "Sprung weight" on the car, then you have something.

Dr.Diff has kits that will help out. You can re-use your old wheels and tires. Not an issue. Upgraded axles can also be had at Dr.Diff but IIRC, only in the larger 5X4-1/2 pattern. Upgarding the front discs to a 5X4-1/2 is also an EZ kit away. Factory or not.