I have 170,000 miles on a stock transmission. Never even changed the fluid. I had a comp, intake, exhaust amd guages installed at 70,000. I have been very good at only running the box at 3x5. My torque converter is shuttring under load and my transmission is starting to slip. The other day I had a wild hair and decided to run on 5x5 to verify any transmission issues. I had a code come up- PO253. I checked with my actron scanner and it read "injection pump metering control A low". I reset and turned box back to 3x5 and no other issues. I am dropping off the truck with Jeff GArmon on friday for a full trans rebuild, raptor lift pump and tweaked waste gate. If needed, a vp-44 will also be installed. (I am only boosting to 15. Jeff says I need to be at 35psi). Truck is 2002 auto 4x4, 9cm turbo, edge comp box, 4" silverline exhaust, workhorse intake, quadzilla commander, 35" terra grapplers.