driveline vibration

[kdeacars]

Hey has anybody noticed a driveline vibration only in 1st and 2nd gear(09 f150 5.4l 6spd auto supercrew with max tow) up to 35km/h while towing a 5000lb trailer? I imagine if i towed something heavier it would be worse but there is absolutley no sign of it with the trailer off the truck. Just hoping somebody else has come across this so i can steer my dealership in the right direction!:

[shelbyx1]

does it have a 2 pc driveshaft,have had to shim some 04-08 for this concern.

[kdeacars]

Yes, it has 2 piece with a hanger bearing and then there is a rubber boot behind the hanger, looks may-be a slip joint built in? How many inches of shims did you typically ad? Thanks

[shelbyx1]

you would have to measure the driveline angles to determine what shimming is required,hint have your trailer hooked up when checking.

[kdeacars]

how many degreeses should it be, the suspension only drops about an inch with the trailer on with the weight distribution bars on!

[shelbyx1]

the max u-joint operating angle is 3deg with the front and rear angles on shaft equal or within 1deg.

[SKRWZ]

I was told by Scott @ Deaver Springs that 1-2 degrees negative is optimal, that way when you torque on it it will be right where you want it to be

[kdeacars]

Ok then is the angle usually out at the hanger, or do i have to shim the rear axle?? and what are you comparing the overall angle to?

[tohi2care]

If it's an 09 just take it to the dealer and claim warranty.:icon_confused:

[kdeacars]

took it in for first oil change and check-up they claim everthing is ok, they want me to leave it with them with my trailer attached! I'm not to comfortable leaving them with it for a day or two with the trailer, ive seen some them drive without trailers! i'm afraid of what it would look like!