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Old 04-02-2010, 08:57 PM
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T-400 Forward clutch questions

On a TH 400, what would the symptoms be if a inner lip seal on forward clutch was not installed? I am rebuilding a tranny and found the inner lip seal missing, and wondering if that could have contributed to the forward clutch being toast.
If not, what would cause only the forward clutch to go, the rest were fine with no sign of wear.
Mickey

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Old 04-02-2010, 10:40 PM
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Quote:
Originally Posted by soBit
On a TH 400, what would the symptoms be if a inner lip seal on forward clutch was not installed? I am rebuilding a tranny and found the inner lip seal missing, and wondering if that could have contributed to the forward clutch being toast.
If not, what would cause only the forward clutch to go, the rest were fine with no sign of wear.
Mickey
Welcome to Hotrodders.com

It is a good idea to put more info in the thread title. I edited the title to reflect the t-400 you are working on. That helps the members here to know which threads to clik on where they can help the most

there are 3 seals for the forward clutch drum.. 2 on the piston , 1 inside the drum

The seal inside the drum can be deleted and the clutch will work fine.

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Old 04-02-2010, 11:25 PM
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Originally Posted by Crosley
Welcome to Hotrodders.com

It is a good idea to put more info in the thread title. I edited the title to reflect the t-400 you are working on. That helps the members here to know which threads to clik on where they can help the most

there are 3 seals for the forward clutch drum.. 2 on the piston , 1 inside the drum

The seal inside the drum can be deleted and the clutch will work fine.

Thanks , what is the purpose of that seal/ And the second part of my question, what would cause only the front clutch to burn up?
This is from my classic RV. The manuals I have leave a lot of questions. For example, one states if you have grooved plates, they go in the forward clutch but fail to say which plates to use if you don't have groved plates.
Mickey
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Old 04-03-2010, 07:42 AM
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Quote:
Originally Posted by soBit
Thanks , what is the purpose of that seal/ And the second part of my question, what would cause only the front clutch to burn up?
This is from my classic RV. The manuals I have leave a lot of questions. For example, one states if you have grooved plates, they go in the forward clutch but fail to say which plates to use if you don't have groved plates.
Mickey

the purpose of the center seal in the forward clutch is to slow down the apply.. the forward clutch uses the full apply surface of the piston. there are small holes that transfer the oil pressure , so the whole piston is applied.

What will cause only the forward to burn up? Many things.. hard seals, worn sealing rings, low oil level in the trans.

Grooved friction plates typically are used in the shifting clutch packs. They will work in non-shifting clutch packs just fine. This aplies to radial grooves or cross groove frictions

Now you will wonder what i mean about shifting clutch packs? Non shifting clutch pack is the forward clutch. It applies at a full vehicle stop and only releases when the vehicle is not in a forward gear.

2nd gear and 3rd gears are shifting clutch packs. Smooth (non grooved) frictions there are very common and will not cause problems or any significant differences

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Old 04-03-2010, 09:31 AM
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Quote:
Originally Posted by Crosley
the purpose of the center seal in the forward clutch is to slow down the apply.. the forward clutch uses the full apply surface of the piston. there are small holes that transfer the oil pressure , so the whole piston is applied.

What will cause only the forward to burn up? Many things.. hard seals, worn sealing rings, low oil level in the trans.

Grooved friction plates typically are used in the shifting clutch packs. They will work in non-shifting clutch packs just fine. This aplies to radial grooves or cross groove frictions

Now you will wonder what i mean about shifting clutch packs? Non shifting clutch pack is the forward clutch. It applies at a full vehicle stop and only releases when the vehicle is not in a forward gear.

2nd gear and 3rd gears are shifting clutch packs. Smooth (non grooved) frictions there are very common and will not cause problems or any significant differences

Again, thanks for the explaination. Let me explain my somewhat abreviated questions: I am physically disabled, Can't walk as result of disease(Freidrichs Ataxia) seems the only part that works is the brain,I think. I tend to type as little as possible also.
I like you're answers as you tend to expand them so they make sense.
Now, transmission was working just fine until I had cold start problems, it would stall unless the idle speed was increased some. That seemed to load the engine for a few minutes before it would free up and run fine, after warming up some. I now believe the load put on the engine before warmup was the forward clutch being engaged. By cold I mean around 40 deg. F.
This warmup was with trans. in Park. All this took place in the yard, moving lturning around half a dozen times.
I hate thinking about installing it back without some certainty that the same problem will not happen again.
I sure appreciate all the information you are providing.
Mickey
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