Crowbar,
That 2.29 is a really low ratio for a truck! Cars generally have lower ratios because they weigh less and because they run smaller tires.
You don't say which tranny you have. About the lowest you can get is the SM420 or SM465, which have a "granny" first at 6.55:1. These had a combined lifetime in Chevy trucks of 20 years or so -- they aren't hard to find.
Is it possible to get higher gears for that rear end? You might find that less expensive than switching transmissions.
Brian
