I noticed driving the 48RE without load, shifts fairly rough. I assume this is because the motor is so powerfull and is built to pull. Am I correct on this or do I need to have the dealership check it out.

 

I have yet to find an automatic behind a diesel that shifts with the smoothness of one behind a gas engine. It's probably normal, but I have no way of knowing what 'rough' means. If in doubt, ask the dealer to drive a different one.

 

It's a very strong, deliberate, thump especially with heavy footed take offs.

 

I would have the dealer check it out. Take the Tech for a drive and show him exactly what it is doing.

While coming to a stop, my 04 would downshift into 1st really hard. Tech said that it was not normal. The cable needed to be adjusted. Tech preformed the adjustment and it shifts perfectly now!

 

I don't know about the 48RE (yet), but with the 4R100 I had in my Ford, most (if not all) of the shift kits made the shifts firmer.

The theory is, as I understand it:

SMOOTH SHIFTS = SLIPPING = HEAT = THE ENEMY

The Hypertech PPIII I used had an option to increase the shift firmness for just this reason.

Neil

 

I agree with that Murvin. If you've ever had a shift kit installed, that's what the shifts on my 48RE feel like.

 

Thanks for the input.

 

My 48RE shifts smoothly either on the throttle or off. Loaded or unloaded. If you're getting a "thump" I'd say that ain't right, at least compared to what I'm getting.

I have a 5.0L Mustang with a shift kit and that has a firm shift. Before the shift kit I'd say the Mustang and 48RE shift(ed) about the same.

One thing I do notice under moderate acceleration with the 48RE and all that CTD torque is the pull when it finally makes it fully into the next gear. Wow! It is a noticable push back into the seat.