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Old Jun 1, 2026 | 06:27 PM
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Default Transmission Fluid Question

Is this transmission fluid a good full synthetic transmission fluid to use even though it says Dexon VI - Mercon LV? for a rebuilt TH400? On the back it does say that this is compatible with all GM Hydra-Matic trannys and I know the TH400's use Dexron VI. Ive done some googling and see that the Mercon LV fluid is NOT the same as Dexron VI. it seems like a lot of fluid I've looked at have been the Dexon VI - Mercon LV.

1. Am I able to use this fluid without any issues? or should I be looking for exclusively Dexron VI?





Last edited by miked123; Jun 1, 2026 at 06:34 PM.
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Old Jun 1, 2026 | 10:41 PM
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I changed my TH400 fluid a year ago but it's original so I didn't use full synthetic.
I forget what the classification was/is...

Youtube "Full Synthetic"....many brands do not come close to FULL.

Last edited by doorgunner; Jun 1, 2026 at 10:43 PM.
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Old Jun 2, 2026 | 12:33 PM
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Dexron 3, non-synthetic
https://www.napaonline.com/en/p/NOL75200
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Old Jun 2, 2026 | 01:44 PM
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Pretty sure this is what I used the last time I serviced the TH400 in my '71




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Old Jun 2, 2026 | 02:04 PM
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all brands-grades of DEXRON ATF are backwards-compatible; and have been since that fluid's inception. This is readily researchable via wiki and other sources
All that is rather well-known.
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Old Yesterday | 10:50 AM
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Originally Posted by miked123
Is this transmission fluid a good full synthetic transmission fluid to use even though it says Dexon VI - Mercon LV? for a rebuilt TH400? On the back it does say that this is compatible with all GM Hydra-Matic trannys and I know the TH400's use Dexron VI. Ive done some googling and see that the Mercon LV fluid is NOT the same as Dexron VI. it seems like a lot of fluid I've looked at have been the Dexon VI - Mercon LV.

1. Am I able to use this fluid without any issues? or should I be looking for exclusively Dexron VI?




This is the same stuff I used in my TH400. Works fine for my car.
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Old Yesterday | 03:08 PM
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Dexron III. Valvoline makes it. I would not use synthetic.
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