transfer case

ok there are 18 spline and 25 spline transfer cases right which is the 5 speed and which is the 6 speed

from what I've been told all cars after modle year 92.5 have the 25 spline.

Yes late 92's got the 25 splines. So that would mean all 6 speeds are 25 spline and all 93's are as well. It depends on build date as to whether a 92 would have a 25 or 18.