You just have to remove the t-case shifter handle, realign the rods with a large screwdriver and then replace your shifter sheet. It is a common problem. Remember, these things are 20 years old. They wear...
http://www.izook.com/reviews/tcasefix/tcasefix.htm
A new shifter sheet can be purchased from most of the Zook vendors. Zuks offroad also has them in brass - a part that you will probably never wear out again.

Bill
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God Forgives, Rocks Don't...