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Old 04-29-2017, 10:53 PM   #1
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Location: Arizona
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Year: 1996
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Chassis: TC 2000
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Transmission leak?

Cummings TC2000 AT 545. Starts right up no problem I checked underneath initially no drips or leaks. Went around the block for a bit then parked her. Checked underneath again and this time saw a couple drops. Crawled underneath and saw the reddish transmission fluid pooling around the transmission pan. So I started it back up and crawled under while it was idling nothing was spurting out like one would expect from a worn seal or crack so I'm confused on where this leak is coming from.

Should I be concerned?

Tom
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Old 04-29-2017, 10:58 PM   #2
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I have never tried it, but home Depot has a uv dye leak kit that says it's good for atf.
It's like $20.00
Leaks can be hard to find and can get worse quickly.

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Old 04-29-2017, 11:03 PM   #3
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get some degreaser, wire brush and a power wash.

hard to find a leak in an all that dirt.

good luck!
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Old 04-29-2017, 11:31 PM   #4
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That's my thought too. Clean it up, then drive it to put the transmission in operating pressures and temperatures, then you should be able to see if it's leaking.
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Old 04-30-2017, 06:34 PM   #5
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Ok I hit it with some degreaser and tried to clean it up as best I could. No running water where I have it parked so it's spray bottles all the way. I drove it back and forth around the lot but couldn't take it on the open road. It's not registered it insured yet. Anyway no leaks or anything so maybe a fluke?

On a separate note I discovered it's a rebuilt AT 540. Is that good or bad?

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Old 04-30-2017, 10:15 PM   #6
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That's all good news concerning the leak so far. The real test should be when you can get on the road. It's not looking like a significant leak, so put that on the back burner until you can put in some road time.

As transmissions go, my guess is you're about in the same boat as the rest of us. I know nothing about the 540, but most of the rest of us have a 545. I'd have to assume that was the predecessor of our beloved 545s. It's touted as a workhorse and has been used for years. These last well with decent maintenance. It's got its drawbacks, such as basically freewheeling on downhill sloaps with little or no engine resistance.

Your transmission has apparently already been remanufactured according to the data plate. I couldn't read the dates. My guess is, if you had transmission problems and had to replace your transmission, you'd be pleased with the price of these transmissions, considering you could hook up a 545. They sell used between $300 and $500, or higher. It's not the best transmission out there, but it's common enough that it won't break the bank when you need a replacement. Of course you can get a certified replacement for big $$ if you want to go that route.

There are newer transmissions, but they have computers that need to talk to the engine computer. A lot of our mechanical buses have avoided the computers, so there's only a few improvement choices. When the choice is necessary we like the 643. It's just a little step up in transmissions and apparently hooks right up, without electronics. I'm sure there are more but I'm not the guy to talk to about those choices.
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Old 05-01-2017, 07:51 AM   #7
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Yea I will keep it on the back burner for now.

Thanks for the feedback I appreciate it.
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