Originally Posted by dmax_83
I put my truck in drive and hit t/h and exhaust brake buttons and go. The transmission is smart enough to pick a gear.
I should clarify my response, my truck is equipped with an Allison trans and both 5th and 6th are O/D. I don't tow fast enough (68mph+) to drop into 6th so my truck stays in 5th, which is still O/D, by default.
When I owned a 1/2 ton, I never towed in O/D.