T-400 won't shift properly - Hot Rod Forum : Hotrodders Bulletin Board
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Old 08-02-2020, 08:40 AM
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T-400 won't shift properly

Guys,

Yesterday out of nowhere my TH400 started acting strange in gears 1-3. It shifts perfectly fine from park to reverse to neutral.

When I go from neutral to drive, it feels like it's barely going into gear and I have to rev it pretty high to get it to move. It drives, but feels like a huge loss in power.

It also won't shift from 1-2-3 gears correctly. Normally you can physically feel it "clunk" into gear, but now it feels as if it's barely going into gear.

The modulator valve has a good connection, the vacuum line is good, and it's full of fluid. Again, yesterday it was running perfectly fine and this happened out of nowhere when I was on the road cruising.

It's a pretty new TH400. Any ideas? I've tried using 2 diff full manifold vacuum sources to the modulator thinking maybe I didn't have adequate vacuum goin to it, but with no luck..

If I can't figure it out today, I might just take to to my trans guy tomorrow.

Thanks

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Old 08-02-2020, 09:24 AM
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I pull the governor out and make sure the plastic gear is good. Then disassemble the governor and make sure it isn't sticking or has any dirt in it. The governor is very easy to remove it is under a 4 bolt cover on the passenger side of the vehicle.
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Old 08-02-2020, 12:47 PM
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High on my list of suspects would be the forward clutch.

Bogie
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Old 08-02-2020, 03:18 PM
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I hope it isn't a clutch. I barely have 1000 miles on this thing. I don't even drive it that hard
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Old 08-02-2020, 05:26 PM
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Check the shift linkage and make sure a rubber bushing hasn't fallen out of it someplace and let it move around...

Also check frame to body mounts and make sure the body hasn't dropped and misaligned the shifter linkage...
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