rear end gearing?

[Bullcrappy]

I think your speedo is wrong because a th350 with 3.73's does not run 3200 rpm at 55mph

if the speed is righg that would be more like 4.60 rear with the 26.5" tiresen maybe th

if your your sure of the rear then maybe the wrong speedo gear is in there? because 3200 rpm with a 3.7 rear is 68mph