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Just found you guys...I use my X to pull racecar box trailers that weigh around 10,000 pounds. Out of necessity my 2001 7.3 has a Ball Buster turbo, Magna Flo 4" exhaust, six position T S Products chip, Diablo trany accumulator valve and Mag Hytec trany/diff covers.
I can pull at 72-75 mph with cruise on and EGT will stay below 1250 degrees. The X has 84k on the original trany filled with Red Line Hi-Temp synthetic and I bought this truck new. My CPS died at 50k and the recall will be interesting.
Sounds like a dang good rig you have yourself there! Make sure you check out the 99-03 7.3l section as well as the Excursion forum, and don't forget about your local chapter either - you can find fellow local Ford enthusiasts there!