Transmission leak

[smsms]

I recently fixed an engine oil leak that made a mess all around the underside of my 77 280z. After a few months of the leak stopping I noticed that my transmission is also leaking at the rear where it meets the the driveshaft. I also noticed it only leaks when I drive it.

Is this because the transmission might be overfilled? Or could it be a bad seal? If I have to remove the driveshaft, what's the best way to do it? I'll add some pics, you can see the oil drip and splatter all over the car. Thanks!

Edited September 23, 2018 by smsms

[rossman]

39 minutes ago, smsms said:

Is this because the transmission might be overfilled

Could be, check it

40 minutes ago, smsms said:

Or could it be a bad seal?

Could be and it's easy enough to replace

40 minutes ago, smsms said:

If I have to remove the driveshaft, what's the best way to do it?

You'll need to remove it if you have to replace the seal.  Just unbolt the drive shaft at the differential and pull it out of the transmission.  Be sure to grease the seal before you reinstall the drive shaft.

 

[smsms]

Thanks for the reply!

I think ill replace the seal anyways, then refill the transmission with new oil.

1 hour ago, rossman said:

Be sure to grease the seal before you reinstall the drive shaft.

 

Is there a lubricant you can recommend for this?

[rossman]

I don't think it matters too much, just some sort of grease to protect the seal from wear on start-up. Some seals come prelubed so you don't have to add it.