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Hi
I have a Ford Expedition 98 4.6L, sometimes the reverse gear doesn't work (it's like i'm on neutral position). It's this only gear who cause a problem, all others works fine. The problem is very random (somtimes is working, sometimes not). Since it's a random problem, at the garage they don't know what is wrong. (Naturally, when I go to the garage, my reserve works fine...)

What is the problem? how can I fix it? Help please!
Thanks
Olivier