New to this forum. Just bought a '79 3/4 K20 square body full time. I believe it has a TH350 and a NP 203 but haven't confirmed. I want to ditch the 203 in favor of a 205. Will the existing TH 350 have the correct tail shaft? (correct splines and length) Do all these trucks have a TH350 or do some have a TH400? Is this a difficult job for a shade tree mechanic?
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