A 66 truck would have Saginaw 3 spd if it was originally a 3spd job.a True 62 OD trans is a Muncie design,it'll bolt in no problem,the length is the same.However,the output spine on a Saginaw is fine like a TH350 tranny,the Muncie has a course spline,gotta swap the yoke,no problem.And the column linkage if used will need reworking
