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Discussion Starter · #1 ·
When looking at the TH400 from the tail section there is a small (approx 1/8th) hose that comes out of the case up close to the bell housing. The hose isn't attached to anything on the exterior, just goes into the case and is attached somehow. Anyone know what this is and what'll happen if I just plug it? When I took the tranny out of the vehicle the hose wasn't connected to anything, just floping there.

Thanks, Dave
 

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Dave_Dean said:
When looking at the TH400 from the tail section there is a small (approx 1/8th) hose that comes out of the case up close to the bell housing. The hose isn't attached to anything on the exterior, just goes into the case and is attached somehow. Anyone know what this is and what'll happen if I just plug it? When I took the tranny out of the vehicle the hose wasn't connected to anything, just floping there.

Thanks, Dave
It is a vent.
You do not want to plug it!!
 

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Discussion Starter · #3 ·
Could plugging this vent hose cause the tranny to shift differently? I have it pluged and lose 3rd gear within a couple of minutes of driving then lose 2nd right after.
 

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Dave_Dean said:
Could plugging this vent hose cause the tranny to shift differently? I have it pluged and lose 3rd gear within a couple of minutes of driving then lose 2nd right after.
Not that im aware of.

400's are very picky about fluid level.

I have seen turbo 350's with plugged vent, build pressure, blow the dipstick out & catch trucks on fire. Atf all over the cats is not a good thing.

Check the fluid level in it, unplug the vent, but it sounds like your due for a rebuild.
 

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j20m715 said:
Atf all over the cats is not a good thing.
I have first-hand knowledge that this is a true statement.

One should always have a fire extinguisher within easy reach in your vehicle. I did...good thing too.

I'll make a guess and say that all slushboxes have that same vent thingy. Little white plastic tube maybe 2" long on top near the bell. I know my old Sami's Turbo 200 and the two 700R4s that now belong to Stretch had the same thing. The vent is there to "let off steam" so if it were plugged, then it COULD cause issues. What are those issues? Couldn't say for sure. All I can say is, "The vent is there for a reason."
 
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