If you pull a trailer the car trans might not be heavy enought the ideal heavy duty trans is a clark 5 speed, has and od and is heavy enough for a one ton, you would normally start it in 2nd , first is a granny gear. there was an article about the clark a while back in one of the 4 x 4 magazines and what is require to put them in. chevy had a bigger bell housing for the farm size trucks that would take a 12 " clutch, you never would wear it out in a 1/2 ton.