john, the other day on the other forum we were talking bell-housings. the reason i thought either would work is because years ago i just had to have a power-booster for tractor pulling, so i bought a 770 diesel with one. i rebuilt the power-booster and the installed my 77 gas which bolted right up to the diesel bell-housing, installed the gas starter and every thing worked. my question is, do the gas and diesel power booster bell-housings have different part numbers? the 770 made a great pulling tractor and the power-booster never missed a shift  for 20+years of pulling and field with a 90+ hp engine in front of it. chuck