I would like to know. can you get high geared rear ends for the P30 chassis? someday I would like to get a higher geared ring and pinion to get the rpms down a little. anyone ever done that?
You might look around for a used Gear Vendor overdrive unit. It worked nicely in the P30 I had..New ones run $2700. They bolt up to the turbo 400 trans, then all you have to do is shorten the drive shaft- about $120.