If you use the bellhousing, clutch and flywheel from the original engine on the 235, the transmission will be no problem. You'll still need to deal with the water pump position, and possibly a slightly different front engine mount. The old "crash box" 4 speed trans takes a little getting accustomed to, since none of the gears are synchronized, but once you learn not to rush things you should be OK. I believe the switch to a 3 speed that was synchronized on 2nd. and 3rd. gear was done in 1947 or 48, and the rugged SM-420 4 speed will bolt up to the 47-up bellhousing, also. I'm not sure that the 46 torque tube rear end will be compatible with the later trans, but someone else should be along shortly to straighten out that information.
Jerry
