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Old 08-10-2021, 06:09 PM
kiallowski kiallowski is offline
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Join Date: Aug 2021
Posts: 4
Default Axel Seal Leak/Differential Fluid Leak?

Hello, back again with another issue with my truck! �� (it happens with an old truck I guess)

Vehicle details:

2002 Mazda B4000 6 Cylinder, 4.0L, 4x4, Automatic

Yesterday I noticed a leak coming from around the front differential on the passenger side towards the passenger wheel. Looking like it is coming from the Axle seal, or Pinion Seal? It has been a very slow leak and grimy/dirty. I’m guessing it’s differential fluid and hopefully not oil (I have been checking oil level daily and it has not gone down). I have had this truck for almost month and this is the first time I noticed the leak (I have been checking for leaks everyday). I usually park on flat ground at my house, but my truck has been parked on an incline the last two days, if that would make any difference.

I’m wondering if the issue is an Axle Seal Leak which is causing this? I’m talking it in to a trusted shop Thursday to get it looked at. Hopefully it’s just the Seal and differential fluid and not oil. which is causing it to slowly leak...

Im just trying to tackle one thing at a time with this truck and looking to get at least 3-4 years out of it.

thanks in advance

Last edited by kiallowski; 08-11-2021 at 07:14 AM.
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Old 08-18-2021, 01:42 AM
Fx4wannabe01 Fx4wannabe01 is offline
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Join Date: Sep 2009
Posts: 4,198
Default Re: Axel Seal Leak/Differential Fluid Leak?

First and foremost, differential fluid IS oil. Gear oil. Period.

Second, it is an axle housing seal...passenger side. Same as driver. Not a crazy leak...we would call it a seep. If it is dripping we'd call it a leak and definitely needs addressed immediately.

Third, the pinion is where the driveshaft mates to the axle assembly, front or rear.

At this age, it is not a bad thing to consider doing a fluid change on both the transfer case and rear axle....don't forget the XL3 friction modifier if you have a factory limited slip.
'01 XLT disguised as a '03 Fx4 Level II.
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