Changed trans fluid in my TH400 and now it wants to slip and not get into gear. - The 1947 - Present Chevrolet & GMC Truck Message Board Network



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Changed trans fluid in my TH400 and now it wants to slip and not get into gear.

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03-18-2026, 09:20 PM

#11

HeavyHauler

Registered User

Join Date: Nov 2011

Location: USA

Posts: 534

Re: Changed trans fluid in my TH400 and now it wants to slip and not get into gear.

Quote:

Originally Posted by BDC90

Low on fluid. Needs to be filled while running.

I did not fill it while running. I put in 4 quarts of fluid. When it wouldnt move after I started it up and let it run for about 3 minutes or so I shut it off and just left it parked in my garage and havent tried again since.

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