Quote:
Originally Posted by unruhjonny
Thanks!
That was my guess, but my knee-jerk reaction was that the logical numbers to use for determining the correct transmission might be the main case casting numbers, or maybe tail housing casting numbers - not a part number that has gone obsolete with time.
Would either of those 478--- numbers be observed on a Muncie ID tag?
(which would have also had the transmission code)
I might not know much about GP's, but that doesn't mean I'm not interested;
I would have thought that finding an four speed in the GP would have meant it was the M20.
I take it both of those part 478--- numbers were used for the M21.
Sorry for disrupting the conversation.
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Short, and to the point!
"part #"...."pick code"..... USAGE
478173.......(DJ)...........'70 233-235-237 & GTO 400 M20
478174.......(DL)...........'70 GTO 400 usage M21 w 3.90 & 4.33 gears (6 tooth speedo drive gear)
478218...... (DP).......... '70 GTO/GP 455 usage M21 w 3.31 & 3.55 gears (believe... 8 tooth drive gear, will have to confirm in '70 DP coded M21)