I have a 35 chevy 1 ton closed driveshaft tube with a 4 speed. I swaped out the 207 for a 1940 216 I bought a bell housing and clutch/ring gear to put my old 35 4 speed on the 216.Now I was thinking of trying to find a 4 speed synchro.trans to replace the non syncro trans, can this be done without changing out the driveshaft tube/ rear end, its a dual wheel rear end and dont want to change out if I dont have to. what year and trans would I need THANKS/ Glen