these isn't a REALLY easy fix, but there is a cheap one.
just replace the seal! takes about 30 mins (including jacking up the car and putting it on jack stands). pop out the drive shaft and replace the seal. just use a big screwdriver and tap the new one in with a hammer.
problem fixed!!
__________________ '86 svo (mean and lean)- 13" cobra rotors, corvette calipers, SN95 spindles, T-Bird FCAs, Griggs k-member, Griggs coil-overs, strut tower brace, subframes, MM C/C plates, Tokico Illuminas, misc engine mods, 245/45r17s, cobra IRS w/ bilsteins and eibach pros.
'67 street cruiser mustang (low and loud)- 351w, 350hp, lowered upper control arms, 600lb fronts 4 leaf rear springs, KYB struts, white gauges, 3.50 gears in a 9 inch, caddy calipers w/ SVO rotors in back, torq thrust D rims. TKO or t56 coning soon!
'90 escort GT w/ 22psi intercooled boost, 13.89@114, stock weight. | 
leaky trans 
