[kwmech]

That is one of the easiest leaks to fix on a 14b. Remove the driveshaft--then the 6 bolts. Clean surfaces and the shims. Very thin application of an ultra silicone on surfaces and bolt back together. Bolts torque to about 50-55. G80 diff is the gov-loc and should only require the 75/90 gl-5 rated oil. A tube or 2 of modifier wouldn't hurt