These parts will work to configure the T-case to the 80e 4-wheel drive output shaft. You'll have to change the output shaft in your transmission. There are an "early" and a "late" output shaft. Early has both trans cooler fittings at the front of the case, the late has one cooler fitting in the center of the case. I don't recall the differences in the output shafts. It has something to do with lube holes and routing.