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  #1 (permalink)  
Old 06-25-2017, 03:18 AM
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Default What ATF to use on Tremec T-56

Going to change my ATF on my T56, have heard go things about Amsoil ATF however there are 3 to 4 different Amsoil ATF fluids. Which one?
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Old 06-25-2017, 04:10 AM
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The company that provided my T56 Magnum recommended Amsoil Synthetic product code ATFQT.
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Old 06-25-2017, 06:16 AM
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Unless specifically recommended by the builder, you are better off going with regular old Dex III.

Here is a pretty decent discussion on the issue and a lot of links to various other articles:

https://ls1tech.com/forums/manual-tr...56-others.html
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Old 06-25-2017, 03:52 PM
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Mobil 1 Synthetic ATF fluid......Good for all the Tremec's transmissions
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Old 06-25-2017, 05:45 PM
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Thanks for the info
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Old 06-26-2017, 05:35 AM
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Straight from the TREMEC website - Probably a good idea to ask them since they're the ones that invested all that money in designing, building and testing the thing...

Transmission fluid is the life blood of your transmission. Proper wear and synchronization depends on using correct fluid. DO NOT USE aftermarket fluid in this transmission. Use only GM Synchromesh (part# 12345349), Pennzoil Synchromesh or Mobil1 ATF. Any other fluid used may cause premature wear and grinding synchronizers and will VOID YOUR WARRANTY.

NOTE: You can use standard Dexron III ATF for break-in, but it must be drained after the break-in period and replaced with Synchromesh or Mobil1 ATF as your permanent fluid.

Last edited by jetblue69; 06-26-2017 at 05:41 AM..
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Old 06-26-2017, 06:14 AM
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Quote:
Originally Posted by jetblue69 View Post
Straight from the TREMEC website - Probably a good idea to ask them since they're the ones that invested all that money in designing, building and testing the thing...

Transmission fluid is the life blood of your transmission. Proper wear and synchronization depends on using correct fluid. DO NOT USE aftermarket fluid in this transmission. Use only GM Synchromesh (part# 12345349), Pennzoil Synchromesh or Mobil1 ATF. Any other fluid used may cause premature wear and grinding synchronizers and will VOID YOUR WARRANTY.

NOTE: You can use standard Dexron III ATF for break-in, but it must be drained after the break-in period and replaced with Synchromesh or Mobil1 ATF as your permanent fluid.

Not what I am reading off their website:


Q: What type of fluid does TREMEC recommended?

A: For all TKO 5-speed models, TREMEC recommends GM Synchromesh™ (GM Part # 88861800) – or equivalent, or Mobil 1 Synthetic ATF. For all other aftermarket models we recommend Dexron III ATF

Section 1-1-3 in the T56 Tremec Service Manual also says use Dex III. The OP does not say what T56 he has. Older ones react negatively to synthetic fluid and can eat the blocker rings.
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Old 06-26-2017, 06:28 AM
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Wait till you see the price of GM synchromesh atf. Last time I bought it it was $16.50 a quart.
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Old 06-26-2017, 07:59 AM
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Guess all them Mustangs runnin' around have the wrong fluid in 'em. The trans lock up, that's why they all crash!
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Old 06-26-2017, 08:13 AM
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Quote:
Originally Posted by keezling View Post
Guess all them Mustangs runnin' around have the wrong fluid in 'em. The trans lock up, that's why they all crash!
I think I heard that was from the transmission housing castings. Tremec is having the transmissions made in China and the castings are crap. After you torque it for a while, the trans case will twist.
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Old 06-26-2017, 01:40 PM
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Whoops, sorry. Party night at the margarita hut... Yeah, the other one was from the American Powertrain site...

Q: What type of fluid does TREMEC recommended?

A: For all TKO 5-speed models, TREMEC recommends GM Synchromesh™ (GM Part # 88861800) – or equivalent, or Mobil 1 Synthetic ATF. For all other aftermarket models we recommend Dexron III ATF

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