Shutter starting heavy load.
Senior User
Joined: Nov 2005
Posts: 290
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From: Albuquerque
It is a driveline angle issue, there is a TSB from a few years ago on this.
My 08 F250, 08 F350 DRW and now my 11 F450 all exhibit shudder when loaded and taking off from a stop using more than 50% throttle.
My F250 was the worst, but it sagged the most under the load of my 5th wheel.
Go to the TSB section on the forum you will find it. It isn't the differential, as you discovered.
My 08 F250, 08 F350 DRW and now my 11 F450 all exhibit shudder when loaded and taking off from a stop using more than 50% throttle.
My F250 was the worst, but it sagged the most under the load of my 5th wheel.
Go to the TSB section on the forum you will find it. It isn't the differential, as you discovered.
Posting Guru
Joined: Nov 2010
Posts: 1,783
Likes: 1
From: WY
It is a driveline angle issue, there is a TSB from a few years ago on this.
My 08 F250, 08 F350 DRW and now my 11 F450 all exhibit shudder when loaded and taking off from a stop using more than 50% throttle.
My F250 was the worst, but it sagged the most under the load of my 5th wheel.
Go to the TSB section on the forum you will find it. It isn't the differential, as you discovered.
My 08 F250, 08 F350 DRW and now my 11 F450 all exhibit shudder when loaded and taking off from a stop using more than 50% throttle.
My F250 was the worst, but it sagged the most under the load of my 5th wheel.
Go to the TSB section on the forum you will find it. It isn't the differential, as you discovered.
I will look that up. Did you have yours fixed?
Senior User
Joined: Nov 2005
Posts: 290
Likes: 0
From: Albuquerque
I never did the fix because the TSB says that you may cause a shudder when driving unloaded if you fix the loaded condition. I mostly drive unloaded and didn't want to tempt fate.
The shudder is only slightly annoying, so it wasn't worth effort to me.
If I were always loaded, I would do it.
Air bags would help because the issue is related to drive line angle when loaded.
My F450 has very little of the issue I am guessing because it sags less when my 5th wheel is on it.
I have had the same 5th wheel with all 3 trucks, so that is a constant.
The shudder is only slightly annoying, so it wasn't worth effort to me.
If I were always loaded, I would do it.
Air bags would help because the issue is related to drive line angle when loaded.
My F450 has very little of the issue I am guessing because it sags less when my 5th wheel is on it.
I have had the same 5th wheel with all 3 trucks, so that is a constant.
Senior User
Joined: Nov 2005
Posts: 290
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From: Albuquerque
Posting Guru
Joined: Nov 2010
Posts: 1,783
Likes: 1
From: WY
Cool. Thanx guys for the info. Helps with the nerves a little bit. So, what kind of damage am I doing, if any? I only the tow the 5er 5-8 times a year. 18k toyhauler. Usually one extended length trip. This year, CO, UT, MN. Several 150-250 mile jaunts.
Senior User
Joined: Nov 2005
Posts: 290
Likes: 0
From: Albuquerque
I am doubtful any damage is occurring, but using less power when taking off from stop will reduce shudder.
It is high torque required to get vehicle in motion from a stop that combines with drive line angle to create slipping/binding feeling of shudder. The drive line at that angle stores and releases tension causing the effect under that loading.
It is really a driveabiltiy issue related to customer comfort and not a risk to drive line.
It is high torque required to get vehicle in motion from a stop that combines with drive line angle to create slipping/binding feeling of shudder. The drive line at that angle stores and releases tension causing the effect under that loading.
It is really a driveabiltiy issue related to customer comfort and not a risk to drive line.
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