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06-10-2015, 06:46 AM
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Registered User
Join Date: May 2015
Location: Cedar Rapids, IA
Posts: 155
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Overdrive Question
I recently acquired a 1966 3/4 ton 4x4 with an SM420 transmission and a divorced xfercase (factory, but I am unsure of model at this point). Did anyone make a bolt-on over drive unit for these systems? The gearing is ridiculously low on the truck and I would at least like to go 55 on the highway if possible. Any info/direction is greatly appreciated.
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