t-shift t-case won't go into 4-lo

[scbronco]

So i decided to test all the 4wd functions before the meet n' greet, and have found an issue. I've got the wild horses twin sticks, and i cant get the front output to go into 4-low. I checked the linkages, and can't find anythin in a bind there, and the stick doesnt budge at all, which has me thinking its something internal. not sure exactly how the shift rails work inside, but no matter how itried to engage it (nuetral, rolling, 1st gear, 2nd gear, etc...) it wont go. I have had it in 4-lo before (last years meet n' greet is the most recent time), but for some reason it's giving me a fit now.

Any advice?