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Old 06-28-2019, 09:47 PM   #1
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Mechanic says trans output seal leaking

When picking up my 2003 Fleetwood Excursion 3126B (Cat 330) for an oil change I was advised the my trans output seal has a leak. Was also advised that it wasn't a big problem - to have it looked at in a future service. 5K since trans fluid changed (and both 2" filters). Still reads OL-OK on level check.

Question - if this is needed in the future, is this a big job? costly? What is the trigger that says it needs to be changed? The coach has 18.5K miles.

Thanks. Paul
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Old 06-29-2019, 06:13 AM   #2
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I would have it changed if it starts leaving a dime sized drip under it while parked for a day or so.
If you let it go, you will have an oil & dirt coating under it as it leaks, going down the highway.
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Old 06-29-2019, 06:24 AM   #3
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I would have the seal changed ASAP. It isn't going to heal by itself. A fairly straight forward job which should be completed in 2 hours or less. The seal is not expensive.
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Old 06-29-2019, 06:49 AM   #4
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Personally, I would get underneath first and verify that it is indeed "leaking". If there are any signs of an actual "drip", I would change. If it is just a small damp area, with no active "leaking", I would monitor and leave it be. Case in point, the pad where the hydraulic pump attaches on my 3126b has a wet spot at the mating interface. It was pointed out to me when I had the coach inspected prior to purchase. The mechanic recommended against replacing, stating that it could go for 20 more years and never become a problem, and it just wasn't worth a repair that his company would charge around $400 for. It's been 5 years and 40k miles since I was told that, and it hasn't gotten any bigger, so I just monitor and drive on.
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Old 06-29-2019, 08:14 AM   #5
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Leaking trans seal

All good points - thanks. I will watch closely - if I see any active drip I will certainly change the seal. If it looks wet, but no drip I would also agree that this may be leaning too much forward. Thanks for your thoughts. Paul
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Old 06-29-2019, 09:04 AM   #6
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Just had that done two months ago. The leak was called out over two years ago during routine maintenance and still had not reached the point where it was leaving puddles of fluid on the floor. The mechanic who did the work said it could go awhile longer before really needing replacement. Nevertheless, I decided to go ahead and have the seal replaced.

Total bill was $330.49 out the door. I'm sure it could have been done for less money around Eugene/Junction City, Oregon, but we're near the end of the line up here and there are not many Allison-savvy shops. And I wanted to do it when we were not traveling.

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Old 06-29-2019, 06:52 PM   #7
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Thanks for the piece of mind

Very happy to hear that this seal change is not such a big job. Love it. Will work on this when we are done with our 8-month full-time adventure. In the mean time I will closely watch the level. Have never seen a drip to date. Good feedback. Thanks. Paul
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