I am looking at rebuilding one, if not both of these transmissions. I plan on getting 2004R parts and the assembly manual from CK Performance. I have many goodies already inside the 2004R. I will definitely upgrade the sunshell and go from a 13 vane to a 10 vane pump. I am thinking of the high performance rebuild in a box for the TH350. It comes with Alto Red Eagle Clutches and Kolene Steels. Also comes with the hardened sprag race and new roller clutches for around $350. The biggest question is a decent TH350 2200 to 2500 stall converter that doesn't slip much more than stock on the top end for a reasonable price. I am already running remote trans coolers on both. Any input or suggestions is welcome.