Quote:
Originally Posted by Green Hornet
In 77...M21 was an ST-10.....The Muncie 4 speeds went away in mid 74....and option code for all ST-10s remained as M21..till 79 anyways
M20...was likely a Saginaw in those years....which used the smaller TH350 yoke...
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Ok thanks. I’m leaning toward that being the only difference in the driveshafts at this point.