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Ive got a 350 with a th400 that I am workin on to replace my 250. I've decide to use my PG instead of the 400, so I am trying to remove the converter so I can put the engine on a stand. The only wrench I go get in to the bolts was a 15mm...Its really challanging me..any tips ?
 

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Are you asking why a 15mm bolt seems to fit your torque convetor bolts rather than a 9/16, 5/8, etc? If so, GM was notorious through the 80's and into the 90's (and maybe some of the 70's, the years all run together...) for using English bolts and nuts, like 3/8, 7/16, etc., with metric heads on them. You may have some factory 3/8" bolts from that era with 15mm heads on them. Or, someone may have used metric bolts. If a 15mm wrench is the right fit, then that's what I'd use.
 
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