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Couple of questions about interchangeable parts

valkman

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Am I correct in assuming that all '66 and up 23 spline 4spd main shafts are interchangeable?

Can a old style syncro rings just be interchanged with a newer style or is there more to it?
SR294SR307.jpg


I'm trying to swap out the guts of a 4spd out of a 68 Roadrunner that has a larger input shaft bearing into 73ish? 4spd stamped PP8334262. The main bearing in the 68 (right) tailshaft is smaller than the 73 (left) go figure.
20170415_160148_resized.jpg


Can anyone tell what correct bearing is for the one on the left?
 

moparlee

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I can't tell you, but the guys at Brewer's can answer all your 4 spd questions. Give them a call.
 
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