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06-10-2015, 06:46 AM
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#1 |
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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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06-10-2015, 09:08 AM
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#2 |
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Registered User
 Join Date: Mar 2011
Location: Co
Posts: 412
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Re: Overdrive Question
Advance Adapter, The Ranger torque spliter it has an over drive of 0.73 and holds up quite well. It can even be used in 4x4 unlike any of the other add on overdrives that need to be in 2x4 to operate.
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63 k20 with cummins 4bt, owned sence 1982 |
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06-10-2015, 12:49 PM
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#3 |
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Registered User
Join Date: May 2015
Location: Cedar Rapids, IA
Posts: 155
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Re: Overdrive Question
Just looked them up. Thanks for the info!
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