'96 and up had the better/revised module, less susceptible to under hood heat issues.
I once had one item on the injection pump that failed, local Diesel Injection shop repaired just that item on it, ran the pump on a big calibration machine they had in shop (whole room full) and reinstalled.
Listening to that machine run, you quickly realize the sounds you hear at idle are not the motor, but that pump itself.
Simple repair, 1/2 day in the shop. But the failure wasn't simple....throttle ran away on the highway, smoked out the masses, barely got over and stopped on the side of the road. Scary.
Put over 300k miles on it.
5-spd shaker....went thru several clutches (not a good mix in stop/go traffic towing).
DRW, no speed demon (but you could break traction) not much good for towing over 10k lbs...always got 15mpg....hills, flats, towing or not....15mpg.
There were some rare 1500s that had the 6.5T, with the 3.43 gears....reports of 25mpg, kept in the families for years, passed down repeatedly to the next generation....they just ran and ran...paint faded out...ugly, but they kept running.
But the best part of that truck?
The SEATS! Comfy and built for wide glide rear ends.
2007 LBZ 3500 LT3 DRW Crew Cab, Sulastics, Putnam XDR 15K, B&W 30K-Turnover GN+Companion, Ride-Rite Air...EFI'd by Rob
2008 LMM 3500WT DRW Crew Cab, 8 'Flat/GN, Workforce Alum Toolbox, Ride-Rite Air Use-ta Haves 2006-6.0 3500 WT DRW ExCab Flatbed, 2005-LLY 3500 LS DRW Crew Cab, 2002-LB7 3500 LS DRW Crew Cab I Live my life in such a way that when my feet hit the floor in the morning...Satan shudders & says "Oh shit, he's awake!"