Transmission shifts to early after rear end gear change.

Ok I have checked the kick down adjustment per the factory method and it is pretty much dead on. I have the 2 bbl carb rod modified so get proper adjustment. I just have a bad feeling with a shift kit put in on top of another if things were missed or assumed to be correct that weren't. I find it strange that the 2-3 shift is better then the 1-2 however and it makes me wonder what they did do. I had asked them to make sure I had at least a 3.8 shift lever and I know we didn't change that. It would be highly unusual for a 318 car to have that high of a lever from the factory. I suspect my 1-2 shift is softer for that reason. I have to pull the pan to replace the leaking gasket they installed so I will have a look when I do that.