Considering your truck is a 92, you may need the Super lift Recalibration computer.
Here is a link to some info for ya
http://www.marlincrawler.com/htm/transfercase/tcaseinfo.htmThis is what it say's about your T-case.
Type 6-B
Installed 1992-1995 pickup, 1992-1993 4Runner
Tall Case
Forward Shift, 4" Offset
10mm Flange Bolts
Quite Run Gears
Block Off Plate
No Flat Washers on Case Bolts
Electrical Speedo Cable Drive
This is what i have. So you know where I am coming from.
Type 3 EFI 4Cyl
Installed 1985 - 1988 EFI Pickup
Installed 1985 - 1989 EFI 4Runner
Top Shift
Tall Style Case
10mm Flange Bolts
Quite Run Gears
With Bearing Retainer Clip
21 Spline Input
I would call Superlift and see if it will work, because then you can just re-program for you tire size instead of re-gear
