Re: SM420 is shot
sounds like you have a coupler for the 32 spline 205 that came later but you are needing the 10 spline for the earlier years 205. I gota have another one somewhere here, I'll start looking tomorrow.
oh, went back a reread further back, maybe im wrong. lemmie know what I can do to help.
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Steve
1971 GMC Longbox. Full Roller Stroker 489 w/ FiTech EFI, Chris Straub Cam/NV4500/205/D60/14B w. Grizzly Locker and 4.11's. 2" Lift on 33's
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