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Transmission & Driveline Transmissions and Differentials

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  #1  
Old Mar 8th, 12, 10:23 PM
jm209modesto jm209modesto is offline
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Default turbo 400 wont stop leaking

hi i recently put a turbo 400 in my 67 chevelle bb with nitrous. i had it built at a local tranny shop, it keeps leaking i checked the pan gasket not coming from there i look up looks like its coming from the lines so i take the old metal tubing lines off replaced them with braided lines with AN fittings still leaking. i wrapped the lines with a rab where they screw into the tranny its dry so its coming from somewhere else. i cant stand this leak any suggestions on where it can be coming from an what to try. ps its leaking on the passenger side only. im running b&m trick shift fluid. thanks
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  #2  
Old Mar 8th, 12, 10:38 PM
jonh jonh is offline
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Default Re: turbo 400 wont stop leaking

How about the fill tube O'ring.
Jon
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  #3  
Old Mar 8th, 12, 10:50 PM
bln bln is offline
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Default Re: turbo 400 wont stop leaking

you wont want to hear this but if its coming out from near the fittings the case is cracked , someone either tightened them too much and cracked the casing rite around where the fittings go in. when you pull the fittings out it will be hard to see maybe its on the top of the fitting area ...... dont ask me how I know
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  #4  
Old Mar 8th, 12, 10:51 PM
pnugene pnugene is offline
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Default Re: turbo 400 wont stop leaking

Quote:
Originally Posted by jonh View Post
How about the fill tube O'ring.
Jon
car isn't running.

The o-ring is a common leak source. I once had a difficult to locate leak that turned out to be a poorly welded support tab on the dipstick tube. The fluid leaked through a pinhole in the tube where the tab was attached to it. It didn't leak when the engine was running, the fluid level rises up the tube when not running.
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  #5  
Old Mar 8th, 12, 10:55 PM
jm209modesto jm209modesto is offline
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Default Re: turbo 400 wont stop leaking

completely dry around the fittings pulled the dipstick out put a new seal also rite stuffed it to be on the safe side. im thinking coming out of the vent tube. shop i had build it gave me a 1 year waranty thinking about pulling it out tomorrow an taking it back to them see what they say.
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  #6  
Old Mar 8th, 12, 11:03 PM
pnugene pnugene is offline
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Default Re: turbo 400 wont stop leaking

Quote:
Originally Posted by jm209modesto View Post
completely dry around the fittings pulled the dipstick out put a new seal also rite stuffed it to be on the safe side. im thinking coming out of the vent tube. shop i had build it gave me a 1 year waranty thinking about pulling it out tomorrow an taking it back to them see what they say.
If you suspect the vent tube, try pushing a length of rubber hose over the vent and route it to a different area. Wipe the tranny dry with a rag, and drive it awhile to see if the leak exits the rubber hose at its' new location. If it is leaking out the vent, and the tranny isn't overfilled, it's time to revisit the builder.
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Son, that there pedal on the right, that's
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  #7  
Old Mar 8th, 12, 11:11 PM
jm209modesto jm209modesto is offline
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Default Re: turbo 400 wont stop leaking

thanks ima try that tomorrow before i pull it.....
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  #8  
Old Mar 9th, 12, 8:29 AM
Dan Orgill Dan Orgill is offline
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Default Re: turbo 400 wont stop leaking

As stated above, I'd be thinking dipstick tube. The rubber o-ring from the factory is just useless, IMHO. I went with a Hughes dipstick tube, which has a tophat design rubber seal, absolutely no leaks.
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  #9  
Old Mar 9th, 12, 3:05 PM
bracketchev1221 bracketchev1221 is offline
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Default Re: turbo 400 wont stop leaking

Take a rubber hose and attach it to the vent. Tie a soda can under the trans mount and route the hose to the can. See if the can fills. I chased everything in my car until I did this. Mine comes out of the vent. I never noticed it with the trans blanket, but with the shield the car was a mess.
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  #10  
Old Mar 9th, 12, 4:48 PM
forcd ind forcd ind is offline
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Default Re: turbo 400 wont stop leaking

could it be the pan-if a stock pan, just like stamped valve covers, it can get bent with to much torq on the bolts, bends it in, then you have to knock it flat
spray some brake cleaner and clean it off, then you have to watch for the leak
you just have to look hard
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  #11  
Old Mar 9th, 12, 5:35 PM
Jim Mac Jim Mac is offline
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Default Re: turbo 400 wont stop leaking

I had this issue with my nova. Turned out it was the o ring, must have cut it when installing it. I fixed it for good during the summer. I put a M-21 muncie in place of it. jim
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  #12  
Old Mar 9th, 12, 6:43 PM
davis95 davis95 is online now
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Default Re: turbo 400 wont stop leaking

Could be the governor cover.
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  #13  
Old Mar 9th, 12, 8:28 PM
The Deejay The Deejay is offline
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Default Re: turbo 400 wont stop leaking

If the vent has been become pinched during installation, or something else is clogging the vent, it will spew out the fill tube..........ask me how i know.................
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  #14  
Old Mar 10th, 12, 5:35 AM
von von is offline
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Default Re: turbo 400 wont stop leaking

Could be shift shift seal or speedo cable drive connector too. Speedo cable drive has both inner and outer seals.
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