Mine will downshift but only when I have it on cruise at about 45mph (county road) on a hill. It won't if the rpm's are higher but they are pretty low already at 45.
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1985 300D Turbo ~225k
2000 F350 (Powerstroke) 4X4, SWB, CC, SRW, 6spd ~148k
1999 International 4900, DT466e (250hp/660 ft/lbs), Allison MD3060 ~73k
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