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Drive shaft have only one seal and seal rear side on metal bush
1 jak up littil gear box because after shaft remov ing time oil no feldown
2 remove drive shaft rear bolt
3 mesher drive shaft seal touching area
4 mesher drive shaft Bush touching area this area damage want send machine Shoppe bush cover and drive shaft that time send seal also
Damege change that Bush also
seals depend on a properly positioned shaft upon which they run
most people when reconditioning a transmission neglect to replace the output shaft ( drive shaft) bush in the transmission extension housing which allows the shaft to move concentric to the seal edge
the seal then cannot preform its duty as the seal surface is continually lost and so leaks
So it would appear that the bush is worn or in the case of transverse transmissions a possible failing bearing or bush
your output seal on the tranny or input seal on your transfer case is bad. you have to pull your transfer case to tell. this is a pretty straight forward job. block wheels. put transfer case in neutral. drop front and rear drive lines.diconnect transfer case shift linkage. there is a short commponent connecting the trans to the transfer case. the bolt on either end face each other. remove the bolts to the transmission. the transfer case is heavier than it looks, i suggest getting help. pull back on the transfer case until it will drop down. it will pull out a bit because of the trans output shaft. replace what will probibly turn out to be the tranny output shaft seal and reassemble in reverse order.
The beaings job is to not only give the axle something to rotate on, but also the keep the axle centered in the hole. When the bearing gets loose, it allows the axle shaft to have an oblong roation, which wears on the seal and allows it to leak. You don't have to run the trans low on fluid to have the output bearings go bad. If you have gone enough miles to wear out a clutch, you have gone enough miles to get some play in the bearings.
it sounds like you have a tail shaft seal gone in the transmission it's not a difficult fix if you are handy. Remove the drive shaft and remove the tail stock seal(there are install and removal tools but a hammer and a screwdriver will remove it nicely)then replace with new seal (if you don't have the install tool a 5" long piece of 2x4 and a hammer works BE GENTLE!!!!)and reinstall drive shaft..........these seals are available at your local auto parts store and are usually no more tan $10.00 hope this helps!.........good luck!