The more I look into this project, the more I lean towards putting the cab on my wheeler with front bobbed bed.
For the hell of it, here's what happened to the poor Dana 30 on Saturday.
I bound a tire in the mud, and hit the skinny pedal too hard.
Wheel the truck for 7 years without a single broken part. Throw in Jeep parts, and it grenades second trip out. (I also never had a locker or 35's)
i could not run a locker with the d35 without constant destruction. i suspect that is the case with you. you can swap back to verify i guess and try it with a locker and 35 in tires. i went to brake bias for traction enhancement which fragged spiders often but i pulled a few piles of those whenever the opportunity arose and could swap them in an hour or two.
the dana 44 offers some advantages....or the fulsize d44 rather over a typical 760 u joint wrangler yj/tj/xj d30.....30 spline vs 27. and the obvious
lockout situation with superior bearing spacing and size and generally better brakes.
those on their own merits are great reasons to go to a dana 44 from a dana 35. whether a ttb 44 or a straight axle 44.
issue to issue and availability are the driving factors for me. a d30 swap for a typical 2wd or sla conversion application makes sense, bolt pattern is good, abs potential is there, and many of the later sla trucks were not cad anyway and had non lockout unit bearing setups. the 30 is upgrade-able over time to address those issues slow and cost over time margins.
a ttb 35 truck is different. for 35's to 37's.... spacers to adapt 5x5.5 wheels out back and ttb 44 outers up front, or just swap in a fullsize ttb 44 and 8.8 are the ideals for me due to current cost and availability.
but axle-shaft destruction like you have experienced wont go away without a bit more investment. a 60 was the only logical upgrade for myself. but i did not put a 60 in because of the d35 weakness as i could have nursed it quite a few more years.......i was murdering the 31 spline 8.8's and got sick of the expensive arb's failing. I also had over 300 hp on tap and regularly ran the truck laden to the limits of weight capacity and tire size.
so my money is you are like me, and would kill a d35 regularly with 35 in tires, but they are such sweethearts to work on as long as parts are available for cheap at the junkyards, they are real easy to live with.