It is not just the output shaft length that you have to check. You also have to check how far out of the face of the transfercse the input shaft extends, as it has to fit into the adapter housing on the back of the tranny the correct amount, or you could end up with problems such as not enough spline engagement, the seal in the tranny adapter not being able to fit correctly on the T-case input shaft and thus leaking, or possibly having to much stick-out, and the T-case not being able to tighten flush to the tranny.