Change from 4-speed to 3w/OD

AJ/FormS said
I used to re-build those RoadRangers for a living. And others too. Prettyeasychit actually. That mightabin the very early 80s, about the time the 15 speeds started showing up. Wait, I remember. It was when the Mack trucks came out with RoadRangers rated at around 1200ftlbs, IIRC.
I really enjoyed that kindof work.
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grew up working on dad an g'pa's big trucks, what i lernt on, wrench'in and driving! been in a few,..rebuilt 13 speed back boxes few times...but far from expert!! really better at driving than wrenchin on them! takes skills to speed shift a rto 12.5-13!!! makes shifting a 833 a walk in a park!!