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Extension for Deep Trans-pan on TH400

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Old Apr 1, 2008 | 03:33 PM
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Default Extension for Deep Trans-pan on TH400

What do I need to use a deep pan on a TH400 with regards to filter?
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Old Apr 1, 2008 | 03:42 PM
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Originally Posted by 1970-Bronze
What do I need to use a deep pan on a TH400 with regards to filter?

Nothing. The filter would be the same. The pan just allows for more fluid which results in a cooler fluid temp.
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Old Apr 1, 2008 | 04:09 PM
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the deep pan will come with a extension and longer bolt to lower the filter. I have a b&m deep pan and thats what it came with.
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Old Apr 1, 2008 | 05:33 PM
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Originally Posted by Silver00V6Camaro
the deep pan will come with a extension and longer bolt to lower the filter. I have a b&m deep pan and thats what it came with.

The TH350 I had in my old red Vette had a deep sump transmission pan but no extensions or extra bolts. Is B&M the only group that does add them? The only reason to lower the filter would be if the fluid fill level were to change, and that would require a different dipstick. If the fluid fill level is unchanged then I don't see a reason why the filter would need to be lowered.

You got a picture of the extension and bolt?
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Old Apr 1, 2008 | 05:43 PM
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i have a th400 in mine. It has a half inch thick flange where it bolts so i would guess thats why i have to have the extension. I dont know if b&m just has them or not. i do not have pics. the extension is not very long its about 1.5 to 2 inches long and the bolt is just a little longer that factory. my pan is not a cheap one either its the 120 dollar cast aluminum deep pan that adds 2 qrts.

Last edited by Silver00V6Camaro; Apr 1, 2008 at 05:45 PM.
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Old Apr 1, 2008 | 05:52 PM
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heres a picture i found a jegs you can see the extension and the longer bolt for the filter.
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Old Apr 1, 2008 | 06:00 PM
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Originally Posted by Silver00V6Camaro
heres a picture i found a jegs you can see the extension and the longer bolt for the filter.

Interesting. I do not remember seeing one like that before.
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Old Apr 1, 2008 | 07:45 PM
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The original GM steel deep pans used on trucks used a longer extension and bolt. Gm has them.


JIM
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Old Apr 1, 2008 | 11:19 PM
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Originally Posted by Silver00V6Camaro
the deep pan will come with a extension and longer bolt to lower the filter. I have a b&m deep pan and thats what it came with.
Mine is the same
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Old Apr 1, 2008 | 11:26 PM
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Originally Posted by 427Hotrod
The original GM steel deep pans used on trucks used a longer extension and bolt. Gm has them.


JIM
Do you remember the year so I can check at the parts store?

Do you think a Trans shop would have it?

Unfortunately, I don't have the bolt or extension.
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Old Apr 2, 2008 | 07:40 AM
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Anywhere back in the late 70's for sure. One ton dualies with T-400's usually had them. Did many of them back in the day.

Best bet is probably Chevy or GMC dealer. It's just a plastic extension tube and a bolt..so shouldn't cost much.

A local trans rebuild shop might have some laying around....but I'd probably just hit dealer to save time. Probably won't be in stock, but they could have it in a day or so.




JIM
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Old Apr 2, 2008 | 08:19 AM
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Originally Posted by 427Hotrod
The original GM steel deep pans used on trucks used a longer extension and bolt. Gm has them.


JIM

I stand corrected. I guess I just never saw one installed correctly.
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