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Old 02-21-2014, 11:07 AM
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Rear Pinion Seal

I was about to change out my rear diff fluid when I noticed some oil pooling from the front of the diff near the driveshaft. It's not an active drip, but it is wet.

My guess would be the rear pinion seal? Fluid level checked fine.

Is this normal leakage for a 150k truck or should I replace the seal?

Thanks for the help.
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Old 02-23-2014, 08:19 AM
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It can't be leaking much if the level is fine and it doesn't appear to be sprayed above from what your picture shows. I would clean the area and monitor before changing gear oil because the entire rear must come out to change the seal. When was it changed last?
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Old 02-23-2014, 08:23 AM
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Quote:
Originally Posted by AMSOILdealer View Post
It can't be leaking much if the level is fine and it doesn't appear to be sprayed above from what your picture shows. I would clean the area and monitor before changing gear oil because the entire rear must come out to change the seal. When was it changed last?
I though you could just remove the drive shaft. Take off the propeller nut and remove the seal with a seal puller. Seat the new one and your good to go. That's how I've done it

Brett
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Old 02-24-2014, 04:54 AM
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Quote:
Originally Posted by AMSOILdealer View Post
It can't be leaking much if the level is fine and it doesn't appear to be sprayed above from what your picture shows. I would clean the area and monitor before changing gear oil because the entire rear must come out to change the seal. When was it changed last?
The truck is at 148K now and I bough it at 125. Not sure when (if ever) the diffs have been changed.
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Old 02-24-2014, 06:11 AM
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If it's just wet, then I would monitor it, if it is spraying all over like mine did then replace it. The rear end does not need too come out, you remove the drive shaft, pull off the hub and there is the seal. Since I don't have the tools to replace a pinion seal the local repair shop charged me $125 for the job.
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Old 02-25-2014, 08:12 PM
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Quote:
Originally Posted by LibertyReloaded7.3 View Post
The truck is at 148K now and I bough it at 125. Not sure when (if ever) the diffs have been changed.
It would be a good idea to change it if you don't know when it was done last. As far as the pinion seal change I have not had to replace any of mine on the diesels. However the two I had to replace required a complete disassembly of the rears. Sounds like you are able to make the repair without doing so. Good luck.
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