Driveline vibration pulling 5th wheel

[Scooterdog]

I noticed I am getting a vibration or shudder when pulling my 5th wheel under 30 miles and hour. 2 years ago I replaced the tranny which currently only has about 3k on it. The truck is mainly used once a week during winter months and the summer time is when we use it to pull the 5th wheel.

I'm just getting around to discuss this since I don't drive it much and if course don't notice it unless I'm pullin the 5ver. I took the truck into the dealership and had the tranny checked and they said it was not showing any codes and its fine.

Any suggestions as to what I should be on the lookout for?

Thanks guys in advance

Scooterdog

[JJR]

It is the 2 piece driveshaft shuddering. Mine does it too when pulling my 5ver. The hitch weight squishes the truck down putting added angle on the 2 piece driveshaft which then shudders on takeoff. Ford says any difference of more than 3 degrees between the 2 shafts can cause shudder. You have 3 options
1. adjust driveline angle to compensate for angle (which can be a pain because the shafts need to be lifted up a little which means getting a new bracket or having one made since it can't be shimed up most likely)
2. if you have a short bed have a one piece driveshaft made (can't do this if it is a long bed, too much tube length)
3. install airbags to raise rear back to the correct driveshaft angle when hooked up