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12-06-2020, 12:02 PM
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#1 |
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Registered User
Join Date: Sep 2018
Location: Sacramento,CA
Posts: 85
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Th400 not shifting to third.
So I’m in sacramento ca looking for a shop to take my truck with th400 not going into third. I want to get it looked and maybe even rebuilt. I just hooked a Ben modulator line up and got nothing still not shifting don’t know what to do. How much is the going rate of a th400 rebuild?
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70 custom10 swb fleet side 454 th400 |
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12-06-2020, 03:02 PM
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#2 |
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Who Changed This?
 
Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,109
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Re: Th400 not shifting to third.
Pull the vacuum line off the modulator and see if there is oil leaking there. It could just be that the modulator is bad. If it shifts into second, is it late and harsh? That is also an indication of a failed modulator. Also, for completeness, make sure the trans is full of fluid.
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~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
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12-06-2020, 03:07 PM
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#3 |
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Senior Member
Join Date: Mar 2003
Location: Colfax-California
Posts: 8,395
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Re: Th400 not shifting to third.
Make sure you have full manifold vacuum there also
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