Quote:
Originally Posted by Janky59
All was not wine and roses however as the trans. would jump out of 3rd gear after a minute or so at a steady cruise. Very disheartening, but more on this issue later.
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My truck is not an OD, but...my original 3-speed failed, and I replaced it with one from a passenger car. Mine replacement transmission would jump out of 3rd gear just as yours does. I eventually figured out that the bearing retainer on the front of the passenger car transmission was smaller in diameter than the one on the truck transmission, and therefore did NOT fit tightly in the hole in the rear of the bell housing. I could never prove that this caused the problem, but either way, it's not correct and something you should be mindful of.
I ended up swapping to a much beefier, later model all-synchro 3-speed from a 69 Chevelle.