Gearbox oil leaking into transfer case

[stealthfoz]

Gearbox oil leaking into transfer case

R32 gtr. I drained my transfer case this evening and it was full of my gearbox oil. Does anyone know what would be the likely cause. Thanks

[Duncan]

By far the most likely cause is someone trying to fill the gearbox through the shifter.....

[stealthfoz]

Transfer was filled through shifter. Gearbox was filled by pump through filler hole

[Hadouken]

How much oil came out if the gearbox?
And how much out of the transfer case vs how much you put in?

[stealthfoz]

Pretty much half/ half. But i put dex111 in transfer and redline lightweight in gearbox and it was all mixed together when drained. 

[breaker1845]

Fill the gearbox and transfer case properly and you won't have the issue.

[stealthfoz]

On ‎9‎/‎04‎/‎2017 at 2:19 PM, breaker1845 said:

Fill the gearbox and transfer case properly and you won't have the issue.

whats the problem with filling transfer through shifter hole?

[rockvale]

Ok lets try and help the guy, it does not matter how you fill the transfer case  or gearbox as long as the correct type and amount of oil is used, un qualified comments by idiots dont bother putting your comments up.

now to your issue of gearbox oil transferring to the transfer case via your centre plate?? (hoping this is what is happening)

1. Can occur if transfer case pump main shaft seal is worn, damaged, or not installed

2. Seal on Shifter Rod worn, damaged, or not installed,

3. But this issue of transfer of gearbox oil to transfer case oil is generally cause by a broken magnet on the transfer case drain plug (Eg the magnet is entirely missing from the transfer case drain plug) What happens over time is the metallic compounds do not collect on the transfer case drain plug magnet (because it is missing), instead the metallic compounds block the very fine filter of the transfer case oil pump filter which creates a high suction vacuum substantial enough to suck gearbox oil past the transfer case pump main shaft seal. The result becomes evident when the transfer case fills up with the mixed oil and overflows out the transfer case plastic breather hose and onto the hot exhaust causing smoke. If your magnet is not present on your transfer case drain plug, you will need to remove and wash clean the  transfer case pump filter and replace

1. The transfer case pump main shaft seal

2. Replace the transfer case drain plug (one with magnet in good condition)

Yes, I have done this twice for customers R32 GTR'S, sorry, but not a small job for such a small damaged magnet on a drain plug!!!