1925 Ford F-250

I have a 2000 Ford F250 V8 Diesel with 102,000 miles on it. I cannot put the truck into gear. It is parked and I think that it may have to do with it not sensing that the brakes are applied. I think this because when I put on the parking break the in-dash light should come on but it does not. Do you have any idea where the problem could be?
January 21, 2007.

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