T56 Leak
Thread Starter
Launching!
Joined: Jul 2019
Posts: 204
Likes: 8
It has been off a month ago to track down a vibration. Only leaks after being driven. Thought maybe the o ring was bad on it. Leak just showed up three weeks after work was done. We are dropping the tranny again late sept since we did not fix the vibration.
The CAGS noid sticks into the shifter area, and the only fluid that gets up there is slung up there by the rotation of the trans internals (it's above fluid level). The noid's O-ring is pretty beefy and when I've ever taken them apart, the noid has always been pretty snug. Since the shifter was off recently, it would make sense to leak from there. I've always cleaned them off and put some Ultra Black on the shifter plate when putting back together.
TECH Resident
Joined: Jun 2013
Posts: 853
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From: Kernersville, NC
The CAGS noid sticks into the shifter area, and the only fluid that gets up there is slung up there by the rotation of the trans internals (it's above fluid level). The noid's O-ring is pretty beefy and when I've ever taken them apart, the noid has always been pretty snug. Since the shifter was off recently, it would make sense to leak from there. I've always cleaned them off and put some Ultra Black on the shifter plate when putting back together.
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Looks like oil/grime on the left side and hex part of the reverse lockout solenoid. Not sure if that follow the same path as the other pictures, but it should be resealed, IMO.
Thread Starter
Launching!
Joined: Jul 2019
Posts: 204
Likes: 8
Ugh, I got under there today to pull out the CAGS sensor and can see it is wet up by where the vent tube attaches to the transmission. It appears high but it is not the shifter plate. Also found motor oil pooling at the back of the oil pan. 
^^^
And let it cure before driving. pretty much all the surfaces on the trans are machined extremely true so there's no need for a gasket to make up for any margin of error. Keep the bead thin so there isn't a whole lot of run-off.
And let it cure before driving. pretty much all the surfaces on the trans are machined extremely true so there's no need for a gasket to make up for any margin of error. Keep the bead thin so there isn't a whole lot of run-off.
Thread Starter
Launching!
Joined: Jul 2019
Posts: 204
Likes: 8
I pulled that plate today and the lip was dry except for one spot. I’m torn that this was the issue or the solenoid under it. I guess we will see. Removed the solenoid and put my ICT Billet plug in anyway. O ring from solenoid seemed to be in good nick.
Last edited by Jon M; Sep 7, 2019 at 04:31 PM.