Is it possible to convert a 2000 Jeep Grand Cherokee Laredo from the 42RE to a ZF 6 speed S6-37 or S6-45 manual transmission? My friend's automatic is slipping badly between second and first from anywhere between 20 mph and 45 mph. It does not like 2nd gear for some reason and we don't know why. The engine makes either 305 Nm or 319 Nm torque which is enough for the S6-37 to handle, but seeing as how the 37 model can handle up to 370 Nm, I was thinking about the 45 model which handles 460 Nm. Nm stands for Newton meters in case you were wondering. I know there's a lot involved, but would it be possible. This is still just a thought in the planning stage, so there's no will this fit here or there talk yet.