Finaly got enough miles on the new engine to push it a bit. Geting wheel hop on a hard launch from a dead stop. About 3500 rpm or so and let it fly. Running a top loader 4 speed, 3.89 Traction lock rear end. Radial tires. New rear shocks. Station wagon rear springs. Original traction masters with new bushings and the front mount bolted to the side of the front spring hanger. Ran home made traction masters with front mount welded to the frame back in the '60's with no problem. Ran bolt on slapper bars later with no problem. Trying to figure out why I'm having this problem now. Same rear springs I had back then. Any possibility the traction loc rear end is doing something funny that I am thinking is wheel hop? Seemed like It was leaving a back strip on the road on the left side but not the right side whch makes me question the tracion loc. Have the right lube and aditive in it.