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Its a topic argued about in the garage all of the time. Much of what people will tell you depends on your build plans and how you are going to use the truck.
For a DD, a 3/4 ton swap would be fine.. 38's will start to get questionable on a balljoint axle imo.. a 3/4 swap is a 14ff and 10bolt, in the 8 lug variety... Tho you could go 14sf to keep it all 6 lug, but that brings up gearing....
And I'll assume you have an auto in there... 700r4... So, if thats the case, your gonna strongly need to consider a gear change when upping your tire size to a 36, 37... you'll burn that tranny up..
Most 3/4 axles you'll find will be 4:10's, which will be ok... 4:56 would be better... here's a gear calc to help you figure out your rpm's...