I think gears would do nothing but hurt you.
Buick owners, nearly as a rule, don't change out gears til they go VERY fast, like pulling 1.2-1.3 60' times, with the front end pointing skyward. Their stock 3.42's are used on VERY fast cars. They usually go to 3.73 or 3.90 as a matter to help response off the line when they have monster turbos. I think all of the fast trucks have MORE than enough torque to blow the tires away, and that it's all a matter of putting it to the ground.
Dunno if any of you have seen, but the "Sally" Syclone that Lee Howie built for Dr. Brinski (who has the webpage with all of his street encounters etc) has turned 1.5 60' times... this is a truck that has been running (not sure if it is still) on the stock motor & big bolt ons. Even has a timeslip up of a 1.52 60' time. It is AWD, and he mentions 'extensive' suspension modifications - and won't give 'em up.
I have a truck here that I'm betting will be capable of 1.5 60' times; AWD and stock motor. We'll have to see.