ANy idea what this is???
Thread Starter
Teching In
Joined: Jun 2025
Posts: 13
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ANy idea what this is??? 
There has been leaking fluid coming out of the tail extension of my trasns so I took it apart to see what it was? I still have no idea what that hole is or what it does? What is it for and why is it leaking? Also can I just plug this hole up?
TECH Junkie
Joined: May 2012
Posts: 3,050
Likes: 715
From: Poplarville, MS
That is the drain back hole for fluid that is in the extension housing. The fluid is coming from the extension housing to case o-ring, extension housing seal or the back of trans or extension housing is cracked.
Thread Starter
Teching In
Joined: Jun 2025
Posts: 13
Likes: 0
ah no its a 4x4 transmission, the leak was because I thought the tcase adapter (extension) was a dry cavity like it is on the new GM 1500 and 2500 trucks. my ignorance ceases to amaze me.
