O.K., maybe my opinion is very biased, but I personally believe that an SM420 combined with a GearVendors O.D. makes the best transmission for a our vintage 1/2, 3/4 or 1 ton trucks. It really is the best of both worlds for those who want to use their truck as a truck as well as driving on the freeway. The SM420 is was heavy duty enough for the 2 ton trucks and the gear vendors unit is even stronger. With the O.D., you can overdrive 2nd 3rd and 4th, effectively splitting the gears. It's like having a 7 speed. You also get to keep your granny gear and low geared rear end for hauling and/or more responsive city driving. The better gas mileage with lower RPMs on the freeway doesn't hurt either. It also helps reduce noise and increases the life of your engine/parts. The stuff all bolts together and on to our old engines, you just have to get the driveline shortened.
Regardless, I agree with Wrenchbender, if your giving it away or selling it cheap, please help out a brother bolter.
Last edited by bigmacdaddy; 05/09/2008 11:53 PM.
