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Old 10-18-2011, 08:06 AM
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Thm 400 Whining

I've got a THM400 that has a whining problem. It also doesn't shift at all when cold. The car must warm up to shift. The warmer it is the better the shift. The car whines at idle and in park very loudly and seems to lessen when in gear. It definitely gets better when warm but never completely goes away. Also even when warm the shift seems to shutter. Any ideas on what my problem may be?

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Old 10-19-2011, 02:24 AM
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Sounds like the Seals are Hard/Brittle causing pressure loss, Pump whine.
Time for a Rebuild.
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Old 10-19-2011, 07:11 AM
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I don't know much about tramsimissions but I do fine with motors. Is this something I could do myself? I was thinking that the pump might be bad. How hard is it to replace?
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Old 10-19-2011, 07:38 AM
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Replacing the Pump is fairly easy. A Rebuild is a little more complicated and probably what's needed.
(An ATSG Manual is a good Idea.)

http://www.crankshaftcoalition.com/w...0_Rebuild_tech
http://cogpro.com/chapters/P-TurboHydraMatic/index.htm

" Links thanks to 'Jake' " from here > http://www.tpub.com/content/trucks1....9-2320-280-34/
Pump Inspection:
http://www.tpub.com/content/trucks1....0579760837.htm
http://www.tpub.com/content/trucks1....0579760838.htm
http://www.tpub.com/content/trucks1....0579760839.htm

Pump Assembly:
http://www.tpub.com/content/trucks1....0579760840.htm
http://www.tpub.com/content/trucks1....0579760841.htm
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