2000 f250 transmission issues
 

Hello, I have a 2000 f250 7.3 superduty 4x4 and Im having this weird issue with my transmission. The transmission was rebuilt ~1 1/2 years ago and was working fine until recent. Intermittently as I'm driving it will act like it is in neutral and just drop out of gear. It never jolts or just slams out its very smooth. After a second or 2 after I let off it will drop back into gear, it doesnt slam back in again it is very smooth. Sometimes it lasts ~15 seconds and other times its like 1 second. I just replaced the speed sensor on my rear differential as the overdrive light was flashing on and off and that was the code that I had and that did not fix it. I haven't been able to see any common factors like what gear I'm in or how high the RPM's are. I brought it to the transmission shop just for them to check everything over and there were no problems with the transmission itself. Kind of at a loss and not sure where to start. I added an attachment of what is happening, it isnt consistently at low RPMS or a certain gear but that is the only video I have of it.

Edit: The overdrive light was flashing and the speedometer was jumping back and forth. The overdrive code was PO500 which is for the vehicle speed sensor I replaced. Not sure if its related to the issue but I figured Id add that info.

When we are sure the new part is good,then it is time to check the wiring and make sure all plugs and connectors are clean, no corrosion , and tight fitting on the pins of the plugs.