bought my ford f-250 superduty 6.0 with 5 speed auto trany 8 months ago pulled the camper and the plug in the bed of truck wasnt conected good so the tow n haul light came on before we could get off the road the truck jolted as if we had been rear ended . got off road hooked inti the other pluf for lights , drove home everthings fine for awhile then the truck starts acting like its jumping out of gear when driving the tow n haull light comes on . if u pull over shut the truck off and restart it the thing runs fine until the next time it seems to be ramdom a friend puts it on the computer dosent fix problem with tow n haul but the truck has alot more power and seems to be spooled up to high get the computer reset to original settings seems to be fixed for 3 months or so then last week we were driving home the truck acts as if it jumped out of gear then a jolt as if we were hit in rear again ,tow n haul comes on pull over shut it off and on again drive on home park it , now it wont hardly go in reverse has about a 4 sec delay then it goes in reverse the trans guy wants to put a trans in it but i want to make sure that is all i need its sounds electrial to me the fluid is not burnt and there is no shaveings in the pan . its is delayed going forward now as well once you get through all gears it runs fine as long as the tow n haul light dont come on then it wont shift into 5th gear also the tac shows it is pulling 2- 3 grand even in park now need some ideas PLEASE

 

come on one of you ford guras jump on this. something with the tow an haul electrical is causing the torque convertor to come unlocked

 

I'd try replacing all of the transmission solenoids. There are 6, they'll run you about $200 from ford for all of them, and its something you can change in the driveway.

Are you running a programmer?

 

Same as Mdub very easy to do wih no special tools required. If you want to try and fid out which one s for the torque converter check with a ford tranny tech but don't ask the service manager.