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Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 03-10-2013, 03:26 PM   #1
bcook_84
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Help with GM Steptronic trans fluid leak, searched

Hello all, I am trying to diagnose a leak on my GM A5S 390R Steptronic. I think I have it narrowed down to the output shaft seal. I have searched and scoured the interwebs to little avail on finding a DIY for changing the seal. If it is something I can do myself (would be a good time to get in and change the flex disc/giubo as well), I would like to do it and save some money, but I don't want to go in guessing. Does anyone have any ideas or suggestions? Also, the leak is not what I would call "severe", but it is not something that I want to ignore either. It puts a nickel-sized spot on the driveway approximately every week. Thank you.

Last edited by bcook_84; 03-10-2013 at 04:06 PM.
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Old 03-25-2013, 10:52 AM   #2
NumbaOneNewb
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How can you tell its the trannu leaking

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Old 03-25-2013, 02:33 PM   #3
bcook_84
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Its a red fluid, and its concentrated at the rear of the transmission. My tranny fluid is no longer the original brown, as I changed it and the filter about 25,000 miles ago. Its not the pan gasket, drain plug, fill plug, or gear selector shaft seal; the areas around those are all dry. I replaced my power steering hoses and reservoir about 10,000 miles ago, and those are still dry, so its not power steering fluid.

I do have the typical flex disc vibration between 25 and 40 mph, and the rubber on the disc is somewhat cracked. Although the vibration is not severe, I'm wondering if it has contributed to the leaky seal...it certainly can't have helped. Even before I noticed the leak, changing the flex disc (along with the engine and transmission mounts) was on the agenda for this spring. If the vibration is causing the seal to leak, I wonder if fixing the vibration will stop the leak...or if I should just change the seal while I have everything apart anyway. I have been able to cobble together a rough set of instructions from online teardowns of the GM 360/390 unit and Bentley Manual instructions for changing it on the 5MT...it doesn't look to be too bad of a job, but I could be wrong.

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Old 03-25-2013, 03:14 PM   #4
TrippinBimmer
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I drain mine the other day and its brown looking o.0
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Old 03-25-2013, 03:19 PM   #5
bcook_84
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Sorry, I forgot to mention that when I changed my fluid and filter I did multiple short-interval drain-and-refills with Dexron 6. That's why my fluid is now red.

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