wOOt wOOt... Finally a topic I feel qualified to answer. IMO, Farmtruc has the perfect explanation.... Turbos like to be loaded..

One other thing to consider.... I assume we are talking AUTO transmissions by the comment made about 3000 stall speed.

I have a '92 GMC Typhoon and we deal with this issue all the time. The Typhoons run a 700r4 and a fulltime AWD setup. The trans has a 3.06 first gear ratio. Because of this, and the stall convertor its possible to leave with quite a bit of boost (I love the 10# launches). The fact of the matter is, with the steep ass first gear and something like 400hp its quite easy to haze all four tires (BEEN THERE DONE THAT) from a dead stop. While its somewhat fun to do this, its really not beneficial to the 60' times...

Anyhow, cut to the chase, Typhoons come with 3.42 ratio from GM, for the most part 99.97% of these trucks still run that ratio, I have a friend however that swapped in a set of 3.08's front and rear..

The concept is, TURBOS make TORQUE (moreso than horsepower). Anyhow, why not LUG the motor down a bit and put that torque to good use instead of hazing the tires off it. Make use of the mechanical advantage in 1st and 2nd gear instead of skating through first gear into 2nd....

Obviously a fullsize truck is somewhat heavier (typhoons weigh in around 4000#) and may benefit from a gear change to get the heavy ass truck moving. While I'm sure a higher ratio gear will increase the 'sporti-ness' feel of the truck I'm questioning the actual time slip numbers.. (each case will be different)..

I know its not conventional thinking but I can tell you my friend picked up like 3 mph at the big end with the 3.08s so thats gotta be worth something.. Oh, and I forgot to mention, he regularly manages 1.4x 60's as well on drag radials