Here is a question for the gurus. When towing with my 02 F250 PSD auto trans before I start up a hill that I know will cause a down shift out of overdrive I turn the OD off and it shifts a little smoother than in the middle of the hill. While doing this I noticed that on the down hill side with OD off you have better engine breaking which would make sense. Now the question, is it acceptable to kick off OD while going down hill for engine breaking or is this hard on the tranny and something that shouldn't be done???

 

Should be fine.......

 

Perfectly fine. An exhaust brake help even more using the same principle of engine braking.

 

Thanks for the info. This is my first diesel and still learning. Probably the best vehicle that I have ever owned. (even better than the 78 Vet I had) Plus this the best web sight I have found yet.................