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Here is the TH400 yoke removed from the '73 Driveshaft.
Can someone point me to a seller for a direct replacement yoke with the 27-splined M20 Transmission? Hopefully a vendor on this site.
The TH400 yoke uses a 1330 u-joint. The M20 27 spline most likely will be a 1310 u-joint. I believe the later Muncies used a 1330 yoke but had a 32 spline main shaft.
You can use a conversion joint or replace the diff pinion yoke to match.
Auto to 4-Speed Yoke Question.
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