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01-12-2010, 02:00 AM
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Registered User
Join Date: Jan 2010
Location: Nashville TN
Posts: 3
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Overdrive help for my SM420
I have a great GMC '66 COE wedge bed car hauler. Everything works great except trying to drive at highway speeds. It also has a 2 speed rear end. Does anyone know if there are any options to replace the SM420 with some type of overdrive. THANKS
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