My guess would be the transmission switch. This is located at the side of the box and is easily gunked up with oil, grease, mud, etc.
The actual shifting is a combination of solenoids, vac & fluid pressure. But gear selection is a function of this switch.
During your work, it could have been disturbed accidentally, or it may just be a coincidence, but I'm betting that's your problem.
Cheers!
Last edited by Lil bastard; 04-13-2010 at 02:29 PM.
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