hi i have a f240 cc sb with the spartan tunes I recently bought a 24 ft gooseneck trailer. i have noticed that when towing with a load on the trailer the car starts to shake not sure if its the motor or the trans has anyone had something similiar happen i have swicthed to the 150 to see if that makes any difference. any help or ideas would be apprecited thanks
My Guess without knowing how many miles or how hard they were is a Torque converter sudder/slipping or clutches startign to slip under load.
Change the Trans fluid and filter to start, and take a look at the fluid coming out (burnt is not a good sign, nor is seeing particles in the fluid).
2008 F450 King Ranch 4X4
5" down pipe back exahust
4.30 L/S gears
Pure performance 4 link front suspension
FASS fuel filter
PTP EGR Delete
Train Horns under the front bumper
2013 Radio/Nav/sync upgrade