I have a 1999.5 Ford F350 4 door dually, 7.3 turbo diesel,bulletproof manual 6 speed transmission, Dana 80 axles with rear trac-lock. Bought it when it was only 2 years old. Havn't looked recently but its only got around 160,000 miles on it. Did most of the needed upgrades- 4" exhaust, lifted...