I have a 1994 F-Super Duty (33 foot motorhome) that has had 3 rear seals go bad in the last 18 months. I have 24,000 miles on it and the first seal went out at 19,500 miles.

Could bad differential oil cause this? The oil in the diff. is a dark brown (almost black) color. Dealer says "Oh well! sometimes they just go bad". 3 of them in 18 mos.??? Gimme a break!

$250 a crack to replace them. Are they that difficult to replace? I looked at the diagram and cannot determine if I would have to pull the rotors in order to replace the seal. I am very mechanically inclined but have never tinkered with rear seals before.

Any help or advice on this would be appreciated.

Thanks.



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Having (3) seals go bad in that period of time leads me to believe something else is wrong with your vehicle.
I have seen many problems with Ford motorhome chassis built from 1992 & up. Most of the problems seem to be driveshaft angularity & suspension related.
Many times these motorhome chassis are sent from the production facility as an incomplete vehicle (sold by FOMOCO & you can check you door tag--which will usually indicate this). After wheelbase is changed (by whomever finishes vehicle); many times the vehicle finisher does not get the driveshaft angularity within specification to prevent seal leakage & driveline vibration.
I have seen this on motorhome chassis with S-135 (Dana) removeable hog-head type diff., Dana 80 & Dana 70 model differentials Which are integerally type differentials.
For some reason, Ford doesn't seem to use their 10.25: Sterling axle on motorhomes.
I think you may need to seek the aid of a professional in the driveline field to accuratly cure your problem.



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gearmanx17

Thanks for the info.