The transmission will default to 2nd gear any time it feels there is a problem with the low/reverse clutch assembly. Unfortunately, there are several things that could cause this and I'd be very hard pressed to offer a solution or even begin to tell you where to look.
My best advice... Call Brian's Truck Shop (870) 422-FORD (3673) and see if they might be able to offer some possible pointers. Because this issue could be either mechanical or electrical, you may have some hunting to do.
I wish you the best of luck and hope it's something simple and easy.
__________________
Bill Cohron - The Mad Doctor  
Power Hungry Performance - The ORIGINAL in Ford performance tuning... Since 1997!
(678) 890-1110
www.gopowerhungry.com - Home of the Hydra Chip, Minotaur Tuning Software, and the new Orion Reflash System for Navistar!
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