ok back in the day i bought an 8.8 with 3.27 gears for 50 dollars i just traded that for one with 4.10 gears good deal eh? anyway what on a guess would an 83 gt with a t-5 top out around with 4.10s. .... also i bought a few new parts... super duty t-5, bbk shorty equal lengths, aluminum drive shaft, and a nos kit 100 Hp shot. car should be fun when i get it back together