solid from factory got 10bolts front and back, although my truck eats a couple diffs every year (rear) , i find it funny my 28 spline axles are holding strong,
and if i had to reccomend you should just go 400 small block, with vortec heads, just go bigger valves in the head, 2.05/1.6, wont cost more then stock size, get the preformance ones from sbi or qual-fast. when you choose this you can get a easy 450hp and over 400ft lbs from 2500-5500 with a smaller cam, you get power and reliabilty, i love doing a mild 400 instead of squeezing a 350, cost is relative