It is possible for the t-case to be adapted but it would require a diffrent input shaft & an adapter [if anybody makes them?] The spline count and bolt pattern are diffrent. It would probally be cheaper to repair the one you have. If you can explain the problem better maybe someone here could help diagnose the problem. I've never heard of a 203 slipping. BTW you have a
K10, a C10 is 2WD.