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Originally Posted by 68w/sbc406
in my 68 the build sheet said M20 which i assume is the same as a sm420, pics not quite as clean as the one above
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nope that is a 465, M20 is GM's generic code for a 4 speed truck transmission iirc. so they used the same code for the 420 or the 465. yours has 2 pto ports so its the 465.