I have them in both my 89 D250 with 3 speed auto and gear vendor as well as 93 Club cab with getrag, love them, get great top speed and when running at 70mph, 1800 rpm with the 5 speed, approx 1950 rpm with auto, due to convertor slippage. The 89 make a great tow rig, my 93
is just used as a pleasure car.