2000 Excursion will not roll backwards - Rear Diff or Trans?
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2000 Excursion will not roll backwards - Rear Diff or Trans?
I have a 2000 Excursion 7.3 4x4 with 237k miles on the original 4R100. Yesterday afternoon I went to back out of a parking space and the truck wouldn't move. When I put it in R, the transmission will engage and upon pressing the gas pedal it acts like it wants to move but will not budge. It rolls forward with no issue or noise. It will not roll backwards at all - not in neutral and not in reverse. The transmission shifts fine but with some hesitation to engage each gear. I have noticed some slippage but nothing crazy.
I 1st thought something might be wrong with the rear end but after some research I think it might be the transmission.
What do you think?
I 1st thought something might be wrong with the rear end but after some research I think it might be the transmission.
What do you think?
Fleet Mechanic
Joined: Dec 2014
Posts: 1,715
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From: Central NH
Pull the rear diff cover. Seen several vehicles over the years break a couple teeth off the ring gear. Going forward they drive fine, but going backward the broken teeth will get jammed between the ring and pinion and will stop dead.
Fleet Mechanic
Joined: Dec 2014
Posts: 1,715
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From: Central NH
PS if its not the ring gear you are only out a half hour of your time and some gear oil. Not that I recommend it, but if it is you can clean out the chunks and probably drive it to the shop to get repaired if you decide to go that route.
Lead Driver
Joined: Mar 2010
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From: West Virginia
Yeah the parking brake is a drum inside the rear caliper. That was my first thought as we but if it won't move at all I'm a little skeptical it could be the e brake as it just doesn't have that much holding power. Either way, the rotor is relatively easy to pull and the diff also relatively easy to inspect. I'd check those two out before proceeding further.
Frmr Ford Trans Engr
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From: SE Florida
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I am having the truck towed back to my house this afternoon. I will check the parking brake and pull the diff cover to eliminate those issues.
I will try that this afternoon.
I will try that this afternoon.
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Lead Driver
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From: West Virginia
I was thinking about this. It's unlikely both e brake sides would fail simultaneously. If only one side did, even with a tight limited slip, the other side should either skid the locked side or just spin. Either way it does something.
Have you checked transmission fluid? If it's super low it might move in one direction but not in another. Actually had an old farm truck that had a bad leak and would only go forward, if I remember right, unless you filled the tranny up. Could have been reverse. Can't remember. Just remember it only went one way once it got a few quarts down.
Anyway obviously you wanna take a look at the fluid too. If there is an silver or black in it, that's a bad sign.
Have you checked transmission fluid? If it's super low it might move in one direction but not in another. Actually had an old farm truck that had a bad leak and would only go forward, if I remember right, unless you filled the tranny up. Could have been reverse. Can't remember. Just remember it only went one way once it got a few quarts down.
Anyway obviously you wanna take a look at the fluid too. If there is an silver or black in it, that's a bad sign.
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Good News -The rear left caliper came loose and was lodged in the wheel. Thus it would roll forward and not backwards. It wore out the rim pretty good. I will try to post pics when I get home.
At least its not the transmission...yet...
At least its not the transmission...yet...
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