[1969 GMC]

I think it would depend alot on what you're doing with the truck...if you go muddin alot, and general offroading, it would be best to stick with 1 t-case to keep things simple. If you are making a rockcrawler, in my mind that'd be the only real reason to double up on the 205's. Most people are ok with the 1.96 low ratio of the 205, but having low axle gears and a low first gear helps. If you were gonna double, might wanna use 203 or something else instead of the 205, simply because it has a lower low ratio, and thats what you want, right? Or you could even swap t-cases to one with a lower low. Just IMO, of course...and have fun building the truck!