Rear Differential behavior when turning
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New User
Joined: Jun 2007
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Rear Differential behavior when turning
I originally had an issue that seemed like it could have been a transmission slipping.
Now I have been able to reproduce the slipping.
It is now occurring when the truck is at very low speed, going up a grade, and turning. it feels like a grind and slippage.
It first started doing this under same circumstances when pulling a fifth wheel.
now it is doing it without any towing.
does anyone have any ideas what I could ask the dealer to check?
Pinion gear? overall check the rear differential? transfer case?
thanks
Now I have been able to reproduce the slipping.
It is now occurring when the truck is at very low speed, going up a grade, and turning. it feels like a grind and slippage.
It first started doing this under same circumstances when pulling a fifth wheel.
now it is doing it without any towing.
does anyone have any ideas what I could ask the dealer to check?
Pinion gear? overall check the rear differential? transfer case?
thanks
Senior User
Joined: Sep 2006
Posts: 140
Likes: 0
From: Southern IL
One of our shop trucks a 99 F350 V10 150,00mi with a limited slip after about 50,000 mi had some rearend noise. We changed the fluid and it made it act like new for another 50,000mi. It is just starting to act up now again. Could be a simple fix, but you never know. like bbender said I don't know if the friction modifier breaks down either.
Welcome to FTE! 
Post Fiend
Joined: Feb 2007
Posts: 7,191
Likes: 4
From: Blairsville,Ga
mine done that really bad at about 10k mi dealer changed fluid,noise went away so did posi
was going to put in new clutches but must have been TSB ford said replace carrier
everything good still clunks in turns after 3 oil changes
got 119k mi now
was going to put in new clutches but must have been TSB ford said replace carrier
everything good still clunks in turns after 3 oil changes
got 119k mi now
Post Fiend
Joined: May 2006
Posts: 10,007
Likes: 4
From: Central Florida
Under heavy power, mine jutters and skips the back end of the truck around. Both tires are locking up and trying to spin at the same speed.
The ring and pinion shouldn't skip or slip, I've had one do it and it's bad. The slipping should be at the tires. On a turn the rear tires have to spin a different speeds to keep traction, if they are locked together then the tire must give. I believe if the diff is failing, then it should default to right side power in forward gears. I am no expert, but if changing the fluid doesn't help/cure it, then you need to look back up the driveline.
The ring and pinion shouldn't skip or slip, I've had one do it and it's bad. The slipping should be at the tires. On a turn the rear tires have to spin a different speeds to keep traction, if they are locked together then the tire must give. I believe if the diff is failing, then it should default to right side power in forward gears. I am no expert, but if changing the fluid doesn't help/cure it, then you need to look back up the driveline.
