I just bought a my first dodge diesel and I think it shifts funny. It shifts good and smooth until I hit about 60 miles an hour then it acts like it slips or lags for just a second before it shifts on out, any idea what's causing this, Possibly need bands adjusted?

 

My Truck will hold in gear longer sometimes if it is under load, it seems a little fickle sometimes, usually if I let off the accelerator it will go ahead and shift.
Not sure if this is what you are talking about though?

 

No Knuckle Head it's not like it is holding a gear longer it is more like it slips or jumps back and forth once before it goes in to higher gear doesn't matter if Iam towing or not.

 

I am trying to remember but I believe by 50 mph you should be in 4th and the T/C locks at about 55mph. The last shift you feel maybe the T/C locking.