I have a 2000 D with 78000 miles. Rebuilt tranny at 46000 miles. Torque Converter took a crap. I noticed about a year ago when i drive on the highway if my foot is on the gas at 70mph it runs 2000rpms. If i let off the gas the rpms drop down to about 1700rpms. Push the gas back down and it goes right back 2000rpms. It does this all the time. I just noticed it about a year ago. could have done it since i got it rebuilt. Im not sure. Is this normal???? I also have a 2003 Ram with 545rfe tranny and it does not do this.

 

the rpms on mine do drop on the highway if i let off the gas and come back up when i get back on it, not real sure about how much but what your describing sounds normal, although i have a 545 in my D so wait for one of the guys w/ a 5.2/5.9 to chime in

 

2000k RMPs at 70MPH sounds correct.

That trans is ready, based on mileage, for the routine maintenance R&R. At a trsuted shop, get a ATF+4 fluid swap, new MOPAR filter and the band adjustments. That gives you a good opportunity to have it looked at to confirm that it is okay and operating normal.

IndyDurango

 

What you are noticing is the Transmission coming out of lock up into a coasting mode. It's a fuel saving feature that allows you to coast when you let off the gas, or coast down hill with out it the Trans being in full lock up eating fuel.

That is normal.

Now if it is doing it more then you last thought I would replace the TPS, but a 300 RPM is normal.

 

Perfectly normal. No need to worry my friend. My 4.7 runs close to the same...and I used to have a 5.2. However, I agree with hydra, watch closely, higher RPM's followed (sometimes) by a slight hesitation can be an early clue for a failing TPS.

 

thanks Hydra!!!! Thats a great explination!!!! I was thinking it wasnt a big deal since it has done it as long as ive known. THANKS!!!!