I have a 2002 and pull a 9000 lb. trailer and have never<br>had a problem. The other day I loaded the truck with a<br>lot of roofing material, had to take it 50 miles away, have <br>a lot of hills in between, going down the hills the trans <br>wanted to shift down every time. Is there a sensor in the <br>rear end that tells when the truck is over loaded. [undecided]

 

HeHeHe...no theres no overload sensor in the rear end...your transmission if its a auto mite be overheating kicking it out of OD

 

I doubt the tranny was overheating, the shifting down <br>started 3 miles from where I started. I may be wrong!<br>The reason I asked was that I heard that GM had put<br>one on with their allison trany.

 

Not sure why its downshifting with a load...is this the only time its done this ??...maybe a ******* can check it for error codes