Shift the selector into "3" when on the highway and see if it downshifts. If it does, it is in 4th gear. I believe the 4th gear ratio on the 722.4 is 1:1. The is also no torque converter lockup clutch on your tranny.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record