My 67 C10 currently has the non synchro 1st gear 3 speed. I’ve purchased a different 3 speed that came out of a early 70s van with the same engine (250ci) that my truck has. I was lead to believe it would be a straight forward swap out. Unfortunately it’s not that simple. It looks as though I’ll need different shift linkage and shorter prop shaft. Does anyone know where I can get the linkages I’ll need & also other things to be aware of?