Transmission in DD
 

Headed to work this morning I noticed that the exhaust sound changed tone as I was going over the overpass and onto the downside of it. I thought that was weird. So I went on and it did it again on the next over pass. So I looked at my RPM gauge and the RPMs jumped up like the torque converter unlocked. As I reached the bottom of the overpass the RPMs dropped to 2,000 at cruising speed. So cruising on it did it again until I approached the next overpass and it stayed at 2,000 RPMs and as I topped it and headed down the RMPs increased to 2,5000 and stayed there until the next overpass and the RPMs dropped as I started up it. If I give it some gas the RPMs drop to normal. Let off the gas and the RPMs jump up as the torque converter unlocks. And when I set my cruise control the RPMs fluctuate from 2,00 to 2,500 and back. This is my daily driver so any ideas will be appreciated. Right now I am gonna go check my fluid level. Tranny only has a 103K on it.
Also could anyone suggest a reputable Tranny shop in the Houston, Tx area if my tranny needs a rebuild.

This could be a failing torque convertor.......I would take it to a shop and have them diag it.....it could also be several other things too

Update... Fluid level was good. Took truck to a tranny shop and he did an on road diagnostic. He seemed pretty thorough and explained everything after he realized I was not the common Joe who knew nothing about trucks. Anyhow we could not make the truck do what it did this morning. He asked if there was a check engine light that came on; which there wasn't. I even checked for a code with my code reader. So anyhow drove to San Antonio and the tranny did not act up 1 time. Maybe it was just a Fluke as he said as the 4L60E trannys have. Either way I will keep my eye on it and the fluid level. Thanks for the information.

Update. I got a tranny filter and gasket. I also picked up 6 quarts of Tech 2000 Dexcon VI tranny fluid. And I went ahead and got plugs and wires too. Next on teh list is the antifreeze so I can flush the radiator system too.
Any suggestions on dropping the tranny pan. How do I remove the shift linkage bracket? Or do I just bend it out of the way? Any ideas appreciated.

DO NOT BEND the shift linkage bracket....remove it.....it should just un bolt with 2 bolts or allen screws.......look around it should be pretty aparent.

Cool thanks! It was raining so I did not get to really look around at it.

you may have to do some scrapping of dirt......in order to find the bolts

Cleaning off teh dirt will not be a problem. I normally keep everything rinsed off regularly.