I recently noticed a rather harsh (rumble strip type) vibration when excellerating modestly when pulling my 5500 lb travel trailer.. It happens about the time the truck changes to 2nd gear and the smoothes out once you get to about 20 mph....This doent happen if the truck is not under a load... If I excellerate real real slow, I can prevent it from happening, and I do mean real slow..

I recently had my truck in for the TSB on the slip yolk grease...It had the "bump" when you took off from a dead start.. The TSB fixed the problem completely.. Im not sure if anything they did could have caused this "vibration under a load" issue I have now.... Any ideas ????

2009 F150 Scab 5.4 3.55
Factory Break Controller

 

Mine does the exact same thing and now it is doing it while not under load. It started when pulling my 5k lbs trailer in between 1st and 2nd gear and acted like a shudder. Now its happening from a stop without the trailer. I'm going to take it in to the dealer.

 

Did you take it to the dealer ??? Any luck ?? I have an appt next week. The problem is that they will not be able to duplicate the problem without putting a load on the truck. I dont expect much to happen because of this. I cant drag my 26' camper onto the lot so they can pull it around....

 

TSB what is that sorry i know dumb?

 

Technical Service Bulletin.

 

Is there a TSB for this ??? I would like to have it in hand when I visit the dealer next week..would it be possible for someone to point me towards it..

 

http://www.ford-trucks.com/navrecalltsb.html
http://www.ford-trucks.com/tsb/fullt...p?tsb=09-22-12

 

Mine did it without being under a load. They shimmer the driveshaft per the tab (sorry can't remember number) and now it does exactly what you are saying while pulling my travel trailer. They told me that I could never make it go away completely. So I'm living with it for now. I only pull my camper about 10% of the time so I figured I could try and bear with it.

 

My dealer told me that if they performed the TSB that I would run the risk of having a drive vibration during normal operation (without a load), so they did nothing, This doesnt sound right to me.. I may try another dealer... This issue did NOT arrise until I had the driveline "bump" TSB done.. I dont see how changing/adding yolk grease could cause this and may have nothing to do with it... Its a shame, this truck pulls so well with the exception of this rumblestrip type shaking upon takeoff.....

 

I just had the TSB done for the "clunk" at start-up (they regreased the splines) and that solved the problem, but now I am also getting the shudder type vibration in 2nd gear when towing about 5500 lbs. Never did it before and I've been towing with this truck for 20K miles. The TSB says that the mechanic has to mark the driveshaft at the front AND rear for reinstallation in the same position and he did mark it at the rear yoke, but not at the center support. I suspect that the U-joints are not indexed properly. If you look at the front shaft the yokes are 90 degrees apart which is fixed. The rear shaft indexing will change depending on how the slip-joint is reassembled. Mine are at about 45 degrees with respect to the rear u-joint on the front shaft. I should have checked it before I brought it in. Does anyone know what the proper indexing is for the two driveshafts? Does the manual say anything other than 'mark the positions?' They have to be aligned properly so that any pulsations cancel each other out when yoke centerlines are different.

 

Wow, That is an identical situation with me.... I guess I will take mine to another dealer and tell them the whole story...If I had to trade back I wouldnt, The bump was a constant problem but the shudder only happens when towing and thats only 5-6 times a year....I CAN prevent it by taking off VERY SLOWLY...I really should do that anyway when towing several tons....

 

Went back to the dealer today. After 6-1/2 hours there they admited that the driveshaft phasing was off "by a couple of splines." After the TSB was performed, the two driveshafts were offset by 45 degrees. Now they are 90 degrees offset which is what "Haulin' Dogg" noted in my post about 2-piece driveshaft phasing and appears to be correct. I haven't had a chance to test it yet with a trailer, but before I brought it in I could barely detect the vibration unloaded, and I did haul a 500 lb bigblock home tonight and I didn't detect any vibration. So... if any of you had TSB 09-25-5 done for driveshaft slip/bump, bring it back to the dealer with background data on this problem/solution.