Leaking transmission, only at random times. weird

rp23g7 · May 12, 2014

My 68 Coronet 904 has a leak.......somewhere.

I had driven the car last week on Mon, then the car sat for 4 days and I went to the gym in the morn on Friday.

Backed the car out and there was a huge puddle of transmission fluid on the garage floor. I cleaned it up, but didn't have time to look at it, and parked it again.

The next day I checked the fluid, it was on Add a pint, so I filled it, looked at the floor and it had not leaked anything. I drove it to the gym, 5 miles each way, nothing on the ground at the gym when I left.

Parked it over night and looked again in the morn, another puddle. Jacked it up, cleaned everything, filled it, let it run in drive, neutral and with the engine off for a hr or so, no leaks. weird.

Put it back on the ground, let it sit over night, big puddle on the ground the next day, WTF, what is the deal??

A383Wing · May 12, 2014

betting shifter shaft seal is bad....and torque converter drain back is probably why it's happening

68GTX440 · May 12, 2014

I agree with the shift lever seal. Jack the car up on the right side in the middle or rear as high as you can go, then wait a few minutes and you should see fluid coming out in this area.

When you look at it before cleaning it up where does it have the fluid?

rp23g7 · May 12, 2014

68GTX440 said:
I agree with the shift lever seal. Jack the car up on the right side in the middle or rear as high as you can go, then wait a few minutes and you should see fluid coming out in this area.

When you look at it before cleaning it up where does it have the fluid?

HMMM looks like the left rear corner of the pan, at least that's where the drips are accumulating

Hemi Rebel · May 12, 2014

Left side would be shift shaft seals. Right side I would say dipstick tube seal

bigmanjbmopar · May 12, 2014

Maybe not relevant but my car had a bad seal at the yoke. looked like back of pan and would only show up after it sat for a few hours. Yoke has what looks like a freeze plug in the center that holds back fluid. pic for reference.

http://i190.photobucket.com/albums/z277/socal57chevy/slipyoke.jpg

Photon440 · May 12, 2014

The fluid level is higher when the engine is turned off, because the pump isn't circulating fluid in the transmission casing. A friend had a car with a similar problem - it would hold fluid with no leaks as long as it was running, but leaked like crazy when it was turned off. I found the O-ring on the filler tube was torn, replacing that fixed the problem.

68GTX440 · May 12, 2014

Put your hand in the area of the shift levers on top and see if it is wet. If so definitely the shift lever seals.
If not maybe pan or the reverse pin. (but they should show leakage most of the time.)

resq302 · May 12, 2014

We just had to repair the gear shaft selector seal on our GTX. Seems to have fixed the problem as it is no longer leaking when it is parked.

rp23g7 · May 13, 2014

Thanks everyone, I will check this out

EV2 GTX · May 15, 2014

Hey RP23...Mopar part # 1-02466548 selector shaft seal. Just picked one up the other day. Mine's doing the same thing.

Leaking transmission, only at random times. weird

rp23g7

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A383Wing

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68GTX440

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rp23g7

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Hemi Rebel

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bigmanjbmopar

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Photon440

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68GTX440

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resq302

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rp23g7

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EV2 GTX

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