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Old 11-13-2010, 11:43 AM
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TH350 transmission oil level at kickdown cable seal

I've been having leaking problems with my kickdown cable in a TH350 transmission. It was always leaking after sitting for a couple of days when the converter leaked back into the transmission and raised the oil level. I changed the "Top Hat" type seal, which was split as suspected, and so far there doesn't seem to be a leak. But, when I pulled the seal out of the transmission to change it, just a few minutes after running my 1940 Ford truck onto the lift, a good amount of oil came out. Maybe half-pint to a pint. This was a warm transmission that had just been run 30 miles and cooled-down slightly to work-on. My question is: was the transmission overfilled? I'm using the short Lokar braided dipstick, which I specified was the transmission when I ordered the dipstick. It seems that the level of the oil was high in a newly run transmission to have it drain this much oil out of the kickdown cable orfice. I called Lokar and they said if it is the short dipstick in a TH350 then the reading is calibrated for that transmission. I've been checking the oil level with the engine running and it is at the low mark when cold. I have been thinking that I was running a little too low, but now I'm wondering if the dipstick reading is off. I could understand if it hadn't run for awhile, but it was still warm from the trip. Is it normal to lose that much oil when changing a kickdown cable seal in a TH350, or was it overfilled without me knowing?

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Old 11-13-2010, 03:41 PM
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sounds to me like the oil level is too high. Last one of those I can remember changing did not do that when pulling out the cable housing.maybe someone else can chime in with a more positive response.
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Old 11-13-2010, 07:04 PM
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Thanks Latech,

That's more than I knew before. The fact that you're a master auto technician makes your information very valuable. The Lokar dipstick may be giving me a false read. As long as it reads low on the stick when the engine's cold with a running reading should mean that it will be somewhere in the middle when things get to running temperature. Using the short dipstick makes the engine compartment look good, but difficult to find out what the level is warm. After I get the warm reading level I'll check it cold before running and see where it is on the stick. Then I can make a mark there and if it reads there next time before I drive it, I'll know it has enough oil.

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Last edited by Elder Rodder; 11-13-2010 at 07:17 PM.
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Old 11-13-2010, 07:22 PM
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You're welcome. That of amount overfill (suspected) should not cause a problem as it will drop when the engine is running and the level wont be high enough to stay in contact with the rotating parts wich can cause the fluid to "whip up " with air and foam,wich can cause pump whine and other driveability issues like slipping when hot ,late shift or nuetral out during shift...etc. If it it not causing a problem, keep it full according to the stick you have unless you can prove it is wrong.
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