I don't think you'll gain much if anything. If the 37 is the same as 38 the tallest gear available on a PU is 3.82. Standard is 4.11. If a Master car rearend will fit, it's 3.73.

Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.