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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
one of two reasons: 1- the part of the shaft which comes in contact with the lip of the seal has a groove in it 2- there is a brass bushing behind the seal in the tail of the trans which is meant to hold the shaft steady; if it is worn, then the shaft is moving out of range of the seals' ability to remain in contact with it.
Likely either the shaft has a wear scar on it that's too deep for even a new seal to compensate for or the bearing that supports the shaft is worn. Other possibility is that the same tech is installing it dry every time he replaces it....you need to put grease on the seal lip so it does not self-destruct before the normal lube can reach it.
Place vehicle on Jack stands, remove drive-shaft, remove old seal with a Seal Puller, place lubricant on inner lip of new seal, install new Seal carefully & do not damage the Output Shaft of Transmission with hammer etc. , reinstall Drive-shaft, lower vehicle, check fluid level, road test vehicle
Based on your description I am going to assume your leak is @ the rear of the transmission. If so, the leak would most likely be from the transmission output seal. To fix, you will have to remove the drive-shaft by unbolting it from the rear axle and sliding it rearward out of the transmission. Once the shaft is out of the way, you will need to remove the seal by inserting a pry bar or large screwdriver between the transmission output shaft and the seal lip and pop it out. Sometimes you may have to partially collapse the steel shell inward towards the center with a small chisel and hammer to releive the press fit. Drive the new seal into the bore and reinstall the driveshaft. Check fluid, road test and check for leaks after the road test.