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Switching to a TH400

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Old Aug 12, 2009 | 10:13 AM
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Default Switching to a TH400
So I recent traded my T56 setup for a PTC built RMVB TH400 with a brake and 4400 stall. Any of you guys running the 400s have any tips or pointers for me?

-Dave
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Old Aug 12, 2009 | 12:58 PM
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They don't like high rpm's, ei-7000 and above.
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Old Aug 12, 2009 | 04:41 PM
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Don't do burnouts in 1st. Start in 2nd, shift to 3rd, then roll out. Otherwise you may F up the trans.
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Old Aug 12, 2009 | 04:53 PM
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Originally Posted by cambirdracing
They don't like high rpm's, ei-7000 and above.
Where are you getting your information from?
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Old Aug 12, 2009 | 05:33 PM
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people use them in supras at 9500 rpms lol
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Old Aug 12, 2009 | 07:36 PM
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Please people...I perfer only first hand expiriences with them...thank you....
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Old Aug 13, 2009 | 06:01 AM
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Originally Posted by Cliff
Where are you getting your information from?


Experience. I have helped my little brother change to many of them in his 8000 rpm small block Nova. I have only rebuilt mine twice in my Big Block 6500 rpm Pontiac.
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Old Aug 13, 2009 | 09:45 AM
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Originally Posted by cambirdracing
Experience. I have helped my little brother change to many of them in his 8000 rpm small block Nova. I have only rebuilt mine twice in my Big Block 6500 rpm Pontiac.
Thats because the Th400 used a snap ring.....it would release at high RPMs. The fix (and comes factory in the 4L80e) is a spirolock.
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Old Aug 13, 2009 | 10:03 AM
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Originally Posted by slow67
Thats because the Th400 used a snap ring.....it would release at high RPMs. The fix (and comes factory in the 4L80e) is a spirolock.
are they sold to fail at high rpms are is that problem taken care of when you buy a professionally built trans?
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Old Aug 13, 2009 | 01:04 PM
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Originally Posted by Zero4488
are they sold to fail at high rpms are is that problem taken care of when you buy a professionally built trans?
A competent builder should know to swap that out.
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Old Aug 13, 2009 | 01:11 PM
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Originally Posted by slow67
A competent builder should know to swap that out.
so a ptc trans would be fine?
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Old Aug 13, 2009 | 03:33 PM
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Originally Posted by Zero4488
so a ptc trans would be fine?
Which PTC?
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Old Aug 13, 2009 | 08:55 PM
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A good tranny guy should have you covered, just tell him your goals and he "should" be able to get you hooked up.
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