i have a 1995 mustang gt. the rear transmission seal was leaking, so i removed the driveshaft and replaced it. the slip yoke was also replaced because of worn flat spot. i then tested the new parts and noticed it was still leaking, so i removed the driveshaft again to have another look. when i slipped the yoke off the (27) spline of the transmission, fluid run out from around the boot of the new seal. do I have a internal seal or bushing that is in the tail housing that needs 2 b replaced, or is this a transmission rebuild project. i have 100,000 miles on the odometer. excessive vibration in the shifter. please help:headscratch:.