Re: Need some engine ideas....
Either one whould do what you want. Im biased to both. The 6BT is too heavy for a 1/2 ton truck in my opinion (1100 pounds dry) & will need a heavy duty transmission & at least a dana 60 or ford 9" rearend. The 5.3 will be a more straight forward swap.
The 4L60E is a good transmissions when taken care of & not abused. Ive seen hundreds go past 200k,
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