1987 300D Leaky Axle Seals/Upgrade Diff?
I noticed that the axle seals at the differential are leaking diff fluid.
So, I drained the fluid and replaced it only to have it leak even more out.
I did overfill it since I only had the driver side of the car on a ramp and I kept going until the fluid ran out the fill hole.
Having said that, does the diff have a vent or did it likely just come out the existing leak?
Now, to the more interesting prospect:
Is there a higher geared differential that I could install for better fuel efficiency on the highway?
I drive about 5K miles a month so I don't care a bit about off the line acceleration.
A boost in MPG would be very welcome.
Since I will likely have to pull it anyway to replace the seals I might as well upgrade if I can.
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