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Old 12-26-2009, 07:07 PM
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What fluid to use on a freshly rebuilt T-400

Greetings all,

I just got the tranny back from the shop and I'm getting ready to fill it and install it. Much has changed with lubricants since '75 when the tranny was built. I have looked at the Synthetics, but I didn't know if it would be better to stick older conventionals. It seemed synths would better less friction= less heat , but we all know what happens when one assumes something.


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Old 12-26-2009, 07:23 PM
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Myself i would use the old dexron , But there are so many products out there
i don't know. I know some guy's that swear by the purple stuff and some that use Lucas.

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Old 12-26-2009, 10:43 PM
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Definetly use the old DexIII, then change the filter/fluid after 500mi. Save $$ for something else, DexVI is costly also.
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Old 12-27-2009, 01:13 AM
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I've had good results from using Type F in my TH-350/400 trannys that were freshly built. I used it to soak the clutches in as well at build up, but I doubt it would matter if another type fluid was used for this, as long as the tranny was filled w/Type F.

FWIW, Type F is what B&M used to recommend when rebuilding w/their kit. Don't know if that's still the case or not.
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Old 12-27-2009, 02:09 AM
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The builder of my roller bearing(all torrington, no thrust washers) TH-400 race trans recommends straight Type F in all his trannys, says the lubricant and friction qualitys are better for a high performance trans than Dexron II. I've also heard the same from other places.
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Old 12-27-2009, 04:46 PM
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Dexron VI is FAR superior to the previous Dexron III product. GM stopped licensing Dexron III production in 2006 so if you buy something labeled Dexron III you can not be assured it still meets the previous specs. Use the latest and greatest, it does cost more though.
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Old 12-27-2009, 10:59 PM
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This is some Info on DexronVI vs DexronIII I posted on another site.

The following chart represents the improvements over Dexron III.

Extended Fill Range = 100,000 miles Normal Use.
Change Interval = 50,000 miles Severe Use.
Clutch Friction Stability = Improved 100%
Clutch Durability = Improved 120%
Oil Film = Increased 20%
Fluid Oxidation = Improved 100%
Shear Stability = Improved 200%
Foam / Aeration = Improved 150%

As "The Factory Man" said above, it's Far Superior to DexIII
A few Posts in this thread with results of DexVI use>> http://www.turbobuick.com/forums/tra...lush-fill.html

Many types discussed here DexIII, DexVI, Type-F, Mobil 424 Hyd/Tractor Fluid, Generic Hyd/Trac Fluid etc.. >> http://www.turbobuick.com/forums/tra...iii-200r4.html More talk >> http://www.turbobuick.com/forums/tra...tor-fluid.html

I would use what's cheap for Break in, after 1st Filter/Fluid change upgrade to your choice, Type F, DexVI, Synthetic etc.. The fluids will intermix without problems.
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