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Gas\Diesel Engine & Transmission:

TH350/205T/C help.



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Old 08-01-2011, 06:59 AM   #1
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TH350/205T/C help.

This is the problem I have. Tranny fluid is getting in the tranfer case. I pulled the 205 out yesterday afternoon. One heavy sob. I removed the tranny to t/c adapter. There is a seal on each side of the adapter. I removed both seals. I will go today and get some new ones. This is the only place tranny fluid could get through to the t/c. Has anyone else ever had this problem with fluid getting in the t/c. I am thinking of installing 2 seals on each side of the adapter. There appears to be enough space to do it. Anyone have any thoughts on this. Pro's of con's. The tranny had never done this before. I started down the hiway a week ago and the t/c puked out about 3 quarts of tranny fluid out of the overflow tube on the top of the t/c. Could the tranny be overpressureing pushing the fluid into the t/c? I added tranny fluid to bring the level back up last weekend. Drove up and down the hiway a few times. Didn't leak anymore. Yesterday, I was gonna drive to town. I pulled the fill plug on the t/c, just to check. About 3 quarts of fluid ran out. So, that was when I decided to pull the t/c. That is where I am at now.
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Old 08-01-2011, 04:02 PM   #2
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I had the same on a 700r4/np241, although my combo is set up a little different - there aren't any seals on the adapter, only on the tcase input, but it was leaking allowing my tcase to over fill.

Changing the seals, should fix it. I couldn't imagine double seals are needed unless the shaft is worn where it seals. How many miles on the current?
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Old 08-01-2011, 06:02 PM   #3
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same on my 400/208 replaced seal , still happens as shaft has some wear.
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Old 08-01-2011, 06:10 PM   #4
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Check your vents, it sounds like the transmission isn't venting and is pushing fluid past the seal. The th350 has the vent on the driver side near the top, just behind the bell housing.

I had the opposite happen; the t-case was pushing oil into the transmission and the vent on the t-case was plugged.
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Old 08-02-2011, 06:26 AM   #5
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Originally Posted by 90'K5 View Post
I had the same on a 700r4/np241, although my combo is set up a little different - there aren't any seals on the adapter, only on the tcase input, but it was leaking allowing my tcase to over fill.

Changing the seals, should fix it. I couldn't imagine double seals are needed unless the shaft is worn where it seals. How many miles on the current?
Don't have any clue on the mileage. I don't remember changing the seals when I built the rig. Didn't leak until now. I put 2 new seals on the tranny side and 1 on the T/C side. Will see. Gonna reinstall T/C this afternoon.
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Old 08-02-2011, 06:29 AM   #6
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Originally Posted by 4x4Freak View Post
Check your vents, it sounds like the transmission isn't venting and is pushing fluid past the seal. The th350 has the vent on the driver side near the top, just behind the bell housing.

I had the opposite happen; the t-case was pushing oil into the transmission and the vent on the t-case was plugged.
I blew through the vent hose on tranny. It is open. Will know if it works this weekend.
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Old 08-02-2011, 01:38 PM   #7
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Gl sounds like the seals were bad.
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Old 08-02-2011, 02:53 PM   #8
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Gl sounds like the seals were bad.
Hope so. That is one heavy piece of hardware. Got help coming over this afternoon.
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