I have a 76 with a 302, C4, Dana 20, 3.55 gears in the rear, and 32" tires. I just rebuilt my transmission and resealed the Dana 20(no new bearings, just seals) and it does great at low speeds, it shifts from 1 to 2 at about 2500 rpms, shifts from 2 to 3 at about 2500 rpms, but when I am at...