I have a 2000 Dodge 2500 that seems to be developing a slip in the transmission. I have checked the fluid (in neutral, after shifting slowly through the gears) and it appears to be fine. The problem usually occurs when letting off the pedal - slight bump is felt - and when getting back on the gas - same bump. Also, I have had to goose after putting the transmission in drive if it has sat for a couple of days. It wasn't long ago that it seemed to jump as soon as I put it in drive. Any advice would be appreciated.

Also, does anyone know a good mechanic in the Washington DC area? I don't trust the local dealer.

 

You might try the 2nd gen forum?

 

Thanks MiniC,,,,, we got him moved.
First off, Welcome to the site rrwiii,
It could be possible that the bump you are feeling is the torque converter (TC) unlocking when you let off and going back into lock-up when you apply more throttle again. This is a fairly normal condition for this type torque converter.
The second condition you describe sounds like torque converter drain back. After sitting for a while, the fluid will sometimes drain back out of the TC and into the pan. It takes a minute or so for the pump to fill the TC back up so that it will engage. This too is not uncommon for these transmissions. My 99 does this from time to time and I've gotten into the habit of starting the truck and then putting in in neutral while I fasten my seatbelt. This is usually enough time for the TC to fill. The guy that installed my after-market TC & valve body (VB) has told me that he can cure the drain back problem if it bothers me and I told him that it didn't. By the time I let the motor oil pressure come up and get my seat belt on,,,, she's always ready to go.

One final note is that these are just possibilities and only my opinion based on your description. These two scenarios are also amplified when the ambient temperature starts to drop and the fluid becomes thicker. The automatics in these trucks can feel very different in the way they shift when compared to normal car transmissions due to the Lock Up type TC. (I mention this just in case you're new to these diesel/automatic trucks)
I'm sure some of the other members will offer you some other possible opinions too. You can also do a Search on torque converter or 47re and find some informative reading. Like me, I'm sure others will want to know when was the filter and fluid changed last, have you had the truck long, how many miles are on it and other info that may help diagnosing the problem.

 

Great advice above!
Just to emphasize - Stock auto tranny has to be in Neutral to refill Converter after sitting for a while. 30 sec will do it. Good habit to get into...with or without the problem.

RJ