transmission leak

Hello...Have a 1994 GC Laredo 4X4 inline 6 cyl.(130,000 miles) Have a leak in the transmission that seems to only occur if I park on a grade...I have a '92 Chevy truck that does the same and transmission guy told me it was a "yoke" seal ???....Any ideas?....Thanks,Pete44

There are two seals in front, the pump housing seal and torque converter seal. Then there are the shift shaft and Speed sensor seals and the rest of the o-rings on sensors. There is the Vent tube and the pan gasket and finally the output shaft seal. Since you say you have a 4x4 and he said "yoke", I'm gonna say your leak is on the transfer case, not the transmission unless he was talking about the Chevy, not the Jeep.