BIIIIIG ocasional leaks at tranny

[Nacho-RT74]

I'm getting quite often some BIG LEAKS coming from tranny... when I say BIG LEAKS I'm not talking about some drops and tranny wet, I'm talking about a POOL after park the car. I have not been able if there is something on my driving what produces that, hard driving, suddenly open throttles, High RPMs, or normal driving.

I have not been able to say where exactly comes the leak... pool normally stays under driver side at front... maybe the linkage seals 

I have read at a Transgo Shifter kit, that sometimes the system keeps some pressure ( dunno rmemebr if says at TC or Valve Body ), not been able to been naturally released, and that makes beat the seals around producing that. I can't remember the exactly words and instructions, but something like that is very tipical on Mopar trannies.

If that's true, how I can be safe from that ? maybe change the shifter speed by speed at iddle up to park ? maybe keep the car iddling at neutral ( or parking ) before turn off the engine for couple of minutes before turn speed ?

The weird on this is that IS NOT everyday, and it looks is under some certain driving conditions

[tan top]

could be   trans cooler line fitting loose    , selector shaft seal    

[62 Max]

If it leaks after sitting it usually is the valve bodyshaft seal.Once the converter drains back the fluid level rises enough to leak at the seal.You can replace it in the car.

[ipstrategies]

I replaced my shifter seal and pan gasket, it still leaks from somewhere if it sits for more then a week, I am wondering if it could be torque converter draining?? (I was told this was most likely cause)

I leave a tray under mine.

[Nacho-RT74]

If it leaks after sitting it usually is the valve bodyshaft seal.Once the converter drains back the fluid level rises enough to leak at the seal.You can replace it in the car.

yes I have replace it on car but removing valve body, not with everything on car. I made my own installer tool on those days to make that with a bolt, nut and couple of THICK washers...

[chargerbr549]

I had a similiar problem on my 74 dodge pickup it would usually leak a nice puddle after a day or so and it was coming from the shift shaft area and it ended up being the area that the shift shaft seal rides against on the valve body had a nice wear groove, after replacing the shift seal several times and finally replacing the wornout shaft it quit leaking.

Kevin

[hemi354az]

After changing the pan gasket to the new and improved Chrysler one, was still having a pretty good puddle. Got serious, got new dipstick with rubber tube type seal instead of O-ring, got new parts and tools to replace shifter seal and got it all jacked up and drained. Looking up I can see real shiny spot on tailshaft just above the rear of the pan. What is that ? How can that be all clean, when all else has road grime from tranny fluid leak ? Hard to see but seems clean all the way to the tailshaft gasket flange . . . reached up and all six of the tailshaft bolts were finger tight !

Tightened all six, cleaned up some of the grime, put the fluid in . . . and it has not leaked a drop since. If I had not had it way up on jackstands and really looked at what was wet, I probably would have never seen the real leak. Please post what you discover is the cause of the leak, and how you fixed it. Thx, Lou.

[hemi354az]

Another thing I learned from a Chrysler Dealer line mechanic - the converter always drains down some into the housing when it sits a few days, and "overfills" the pan. That is why the dipstick tube and/or shift shaft seal often weep. It gets pumped back into the converter when running in NEUTRAL, not Park, and of course, in gear. If it has been sitting a while, and you go to change the dipstick tube, soon as you pull it out, all the drained down fluid will come out and you'll have a big mess. Drain the pan (I put a drain on mine), then change the dipstick tube O-ring, or install one of the new style tubes that has the big tube sleeve seal on it. But be quick, as the converter will continue to drip, drip, drip, all the time you're working on it.
I run my "sitting" 727 equipped stuff every week or so in NEUTRAL for about 5-8 mins now.
GMs and Fords pump in Park (and that is where you check the level) but Mopars pump in NEUTRAL, and that is where the fluid level is checked, as written on the dipstick. I never noticed that before, as my first cars were GMs.

[squeakfinder]

    Sounds like a shift selector shaft seal. Not fun to replace with transmission in the car but possible. Sounds like you have tool allready to do the job.

[R2]

I had a smiliar problem, drove me crazy. 

I would dry it off,,,,come back the next day,,,and have a puddle under the car.....

I thought the pan gasket was leaking........

I thought i overfilled it,,,and it was coming out the vent........

wrong..........................

I had a bad neutral safety switch,,,,,it was leaking near/around the small prongs in the middle of the switch.....apparently there was a bad batch of switchs out there,,,,,,took 2 minutes to change,,,,and now is totally dry..........

just something to check ,,,,,,,