Before you decide on the transmission, evaluate how much highway speed driving will be done and what your current rear gear ratio is. A numerically high (like 4.11:1) rear end used a lot for highway driving would probably be more comfortable with an OD transmission. If just used mostly for quick trips to the Dairy Queen a TH350 will do the job.
'57 GMC 102, Original 347 V8, HydraMatic, 3.08 rear gear, added A/C, disk front brakes, HEI, AFB carb, '98 Honda Black Currant paint. T-boned and totaled 10/12
'52 GMC 152 Stake Bed, Original 228, SM420, added A/C, HEI, disk front brakes, '67 Chev 3.55 rear gear. Gets used as a real truck.
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