SM-318 3 speed transmission removed from '57 GMC 152. I have no personal knowledge of its condition, but previous owner says it worked correctly. I have turned the input shaft in each gear and feel no lumps or bumps. According to 1960 Master Parts Catalog, this transmission was standard equipment on '55.2 through '60 six cylinder equipped trucks as well as '55.2 and '56 V8 equipped trucks. Case casting number 3845122 with a casting date of March 19, 1957 Tail case casting number 3707195 Side cover casting number 3845157 $150. You pay shipping and packaging costs or pick up 30 miles north of Houston Tx. This tranny is HEAVY!
