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As the title states it’s just a census of what you guys are running in your General Motors 4 speed transmissions. I’ve got an impala with a 4t65 and I’m running maxlife over two pan drips so about 75%ish replacement.
What’s in your GM 4 speed?
- Thread starter SkaEnthusiast
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I always ran Maxlife Syn in mine (4L60E). Never had a single problem with it in 150,000 miles.
I did a spill and fill every 15-20 thousand miles. Overkill? Maybe, but is was so simple on this transmission that it maybe took an extra 10 minutes when changing the engine oil.
I did a spill and fill every 15-20 thousand miles. Overkill? Maybe, but is was so simple on this transmission that it maybe took an extra 10 minutes when changing the engine oil.
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Currently probably about 60% Valvoline DEX VI, ~40% of what I assume was factory Dex VI, with half a bottle of auto-rx in it.
Dex 3 that I put in when I repaired the TCC bore in the valve body.
I haven't changed the fluid on one yet, but when I do, I'll use Maxlife, unless Castrol happens to be on sale at the time.
Also, since GM doesn't include a drain plug, get an aftermarket pan that has one, which will make future ATF changes much easier
Also, since GM doesn't include a drain plug, get an aftermarket pan that has one, which will make future ATF changes much easier
Delvac 1 ATF (TES-295) in my 4L65E, Maxlife is a good choice in my opinion though!!
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Is that the synthetic 1 to 1 upgrade of dex3?
Essentially, although TES-295 I believe is more friction modified like DEX VI but with the full viscosity of DEX III and more shear stable base oils.
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This brings up a question I’ve always wanted to ask of; for the transmissions originally designed for dex3 wouldn’t TES-295 be a better candidate for transmission fluid than dex vi since the starting viscosity is a better match and it is (presumably by me) similarly shear stable?
Castrol Transynd held a Dexron IIIG approval at one time, Mobil Delvac 1 ATF is a clone of Castrol Transynd.
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I was running the Castrol multi synthetic in my last 4L60e … changed pan volume every 30k … 8 years of smooth/solid shifts on/off road with 4.10 gears …
That's the conclusion I've drawn from reading this forum and some of the comments of an ex-Allison engineer that's posted here and some other forums before.
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I may be trying that in my next pan drops or fluid exchange with this information.
TES-295 is Allison's spec and is a very robust trans fluid.
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Allison, ExxonMobil team on synthetic ATF
Allison Transmission, Inc. has announced it jointly developed with ExxonMobil the new Mobil Delvac Synthetic ATF, a fully synthetic TES 295 certified automatic transmission fluid...
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Mobil 1 122062 Mobil Delvac 1 ATF | Summit Racing
Free Shipping - Mobil Delvac 1 ATF with qualifying orders of $99. Shop Transmission Fluid at Summit Racing.
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You'll get different conflicting stances on the subject, Member Whitewolf didn't care much for TES-295....But I think he had a hand in the development of Dexron VI. The Allison fluid engineer we had for a VERY short period thought TES-295 was superior & of course had a hand in it's development.
I've been using TES-295 in GM 4 speeds for years & really like it's performance.
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Summit sells some good juice … ironically I get my Delvac 1 gear oil (for GM rear end) from them because the Porsche track guys slurp it up for the “rearbox” …This is the best deal I've seen for anyone that suddenly feels the need to go out and buy some TES-295 fluid, at $8/qt it's the same price as buying DEX VI at the autoparts store.Mobil 1 122062 Mobil Delvac 1 ATF | Summit Racing
Free Shipping - Mobil Delvac 1 ATF with qualifying orders of $99. Shop Transmission Fluid at Summit Racing.
Class 8 long OCI gear oil that works great in so many applications …
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