Tea time
Your fine great grandpa. It will hold up under cruising.
Do start or end with your a dik or both?
I'd say your spot on Ed. The input shaft gives up around 600hp or 520ft lbs
The planets don't like shock loads and nasty shift kits with little low stall big converters. Back off the banging hard shift and they do just fine. You can add clutches to soften the hit from gear to gear. The 80 shifts like mud imo but it will last longer under a beating. I did not put one in the 97' Z71 5.7 Vortec GMC pu with 3.73's when I broke hard parts backing up a steep hill/driveway with two cords on the car carrier and a face on the truck. I was on it in the mud and it hooked up the front locker on hard pack dirt, new tires 33" MT, boom. Lots of weight there on a very steep incline... all my fault. It had one and three left. No others gears. Drug it up ttt with his tractor to unload it. Replaced with a stock 150K 2000 2500 suburban trans that had the new t-case I did not use. It tows heavy logs sometimes pulling 8K.
No issues 50K on it still bone stock. Trans was rebuilt I do believe. Suburban lost a head gasket and got hammered.
