That being the case there are a few longevity things you can do to help you be more aware of how the engine is performing (gauges or a screen device) and a bit less restriction on the exhaust wouldn't hurt. A mild program would likely be OK but you don't want to do stage 1 or better injectors or much else performance-wise until/unless that 4R100 is built beyond factory specs (to include the torque converter) which isn't cheap. I was lucky in that I have the ZF-6spd in mine (with a new clutch) and it's almost bullet-proof. Much better than the Mercedes G-56 in the Ram.
My mods are as follows: Straightened (factory) exhaust, Wicked Wheel II exhaust wheel for the turbo (quicker spooling), gauges (pyrometer/EGT, Boost and Fuel pressure as I don't need to worry abut transmission temp), TS Six position switch (with tuning by Matt at Gear Heads in TX which gives me "stock", high idle, +80, +120, +140, +160hp), Full Force Stage 1 injectors, Napa 6337 open element air filter (just as much air and filtration as the OEM HD. filter and about $50-90 less, and had already had the lift pumps, Hpop, Lpop, glow plugs and turbo replaced before I bought it.
With 4:10 gears she ain't fast, but for weighing almost 10K empty, she can be reasonably quick and pulls VERY well. I should be in the 370-400hp ball park at the rear wheels (once I replace the leaking doughnut gasket at the turbo) and can drag a friend's 28' GN loaded at 24K pretty well.
