Transmission Shuttering while Towing

[dagall]

Hi guys, Just started towing my 1800lb boat with my '06 Mountaineer AWD. Under normal driving the trans seems fine, smooth, somewhat normal shifting - the shifting issues as discussed all over the forum. While towing my boat, the vehicle shutters or vibrates. Any thoughts?

 

[bojans]

Are you in OD? You may be building up excess heat causing rough shifts. Is this a V6 or V8?

 

[feetwet]

does the trailer tow smoothly on other vehicles? keep the overdrive turned off.

I have a boat that is slightly heavier than that. I tow with my 2006 v8 ex. at one point I put some good radial tires on my trailer and it towed a lot smoother than the bias ply tires that came with the trailer. this was not specific to stopping however.

 

[dagall]

It is a V8 and I have tried in both OD and not. As soon as I take off with the boat, I get the shuttering. There are no brakes on the trailer and it was my fathers trailer and boat and he has not had any issues towing it. I wonder if it is just the transmission in this vehicle that has given so many people issues.

 

[Bill MacLeod]

How many miles on the vehicle? Trans calibration been updated? (TSB)
Trans fluid and filter ever been changed?

 

[dagall]

Vehicle is an '06 with just over 40k, trans fluid has not been changed yet. Had an update done about a year ago.