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6.4L Power Stroke Diesel Engine fitted to 2008 - 2010 F250, F350 and F450 pickup trucks and F350 + Cab Chassis

Tow/Haul mode

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Old Nov 3, 2009 | 11:58 AM
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Tow/Haul mode

I recently towed my 10k 5th wheel 550 miles in tow/haul mode and the tranny downshifted very smoothly. Yesterday I towed my Brother in Laws 5th wheel for service and the downshifts were very jerky at times. Should this be taken to the dealer to look at? The truck has 3500 miles on it.
 
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Old Nov 3, 2009 | 12:34 PM
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From: Middle Tn.
Did you readjust the TBC to compensate for the difference in his brakes as compared to yours?
 
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Old Nov 3, 2009 | 12:40 PM
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I did not. I will try that when I pick it up.
 
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Old Nov 3, 2009 | 12:59 PM
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always gotta adjust the gain according to the load.

My best way to do this is to hook up go about 25 mph and adjust the gain using the manual lever on the TBC. Trailer should be able to stop both at this point.

Adjust as necessary.
 
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Old Nov 3, 2009 | 01:05 PM
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Originally Posted by DWhittaker
I did not. I will try that when I pick it up.
Sounds like his trailer is pushing your truck when braking instead of helping to stop it.
 
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