4L60E Aftermarket (amazon) pan fitment issues.

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El Tigre

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Trans shops don't like it because they want a generic fluid to use in all transmissions.
 

Caman96

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They (4L60Es and 700R4s) all look the same inside when I tear them down, and last roughly as long on average, whether they used Dex3, Dex/Merc or Dex6 fluid...I have done several that were fed a steady diet of Dex3 or Dex/Merc for over 200k before needing overhaul...Would Dex6 have materially extended the lifespan of those transmissions? Maybe But probably not, at least not by years or thousands of miles.

I'm not saying any of your above is wrong; GM does recommend it for the legacy 4speeds and I'll recommend Dex 6 for any of the newer stuff..Have plenty of customers that use it in their 700s, older 4L60Es, etc and they like it as well...I run standard dex/merc in my older trucks; newer one (6L80 trans) will see nothing but Dex6.

So in my opinion (and it's just my opinion), at least for the older stuff, I don't see the benefits relative to the cost nor can I tell much of a difference in shift feel/quality based on fluid difference alone, at least in my transmissions which are already set up to shift crisp/quick via mechanical calibration mods, etc. Dex6 will do a better job if temps are consistently above 220, which they really shouldn't be regardless of fluid type. Keeping the trans cool isn't usually a problem for most vehicles; those used in HD or HP applications or simply spend lots of time in hot climates benefit from higher cap trans coolers, so as long as you're not overheating chronically Dex/Merc is fine (again, older vehicles like GMT400 trucks).

The only 'harm' in going with Dex6 over DexMerc is simply higher cost relative to benefit, which is what @Caman96 was really asking about and what I responded with the opinion I did.
I would’ve used this if it was available locally:
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This is available locally and what I’m using:

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Nick do you recommend replacing filter seal with every filter? I didn’t last time, I’m guessing it’s quite possible the original seal is in it. I did a new filter at about 50k(original) a couple years ago. I did a complete fluid exchange at that time and have drained pan a few times since, cycling new fluid in to keep fresh. Anyway, hoping to just pop a new filter up in there. Open to any other suggestions as well with 82k on truck now.
 

NickTransmissions

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Higher cost?
$2-3/gallon in transmissions that cost a grand, or more? Come on, man...
Think its more of a difference than that, unless im shopping at the wrong places (definitely possible). But like I said, run it if you want in the older stuff, there's no harm in it. Folks also like Type F for a bit firmer shifts, quite a few of my customers use it in their GM transmissions.

Trans shops don't like it because they want a generic fluid to use in all transmissions.
Generic? What do you mean by that?

Transmission fluid is highly regulated so you're using one of the formulations out there based on make/model/vintage, regardless of what company's name is on the bottle but there's no such thing as "generic" fluid, at least not how you appear to be using the term.
 

NickTransmissions

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Nick do you recommend replacing filter seal with every filter?
Nah, not unless it's unable to hold the filter in place on it's own. I tore down a 94 4L60E core that ended up being grenaded inside, massive overheating but the filter seal was in like new condition.

If you do want to change it, you can simply tap and pry it out with a small flat blade screwdriver. A new one installs with a bushing driver or socket of the right size...
 

NickTransmissions

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How 'bout that "universal" Castrol fluid pictured a couple of posts ago?
Believe I will continue using the fluid specified by GM instead of gambling.
Do whatever you want, man. Doesn't impact us one way or another...
 

El Tigre

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Bet few believe any "universal" fluid is better than the only fluid specified by GM.
 

Caman96

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How 'bout that "universal" Castrol fluid pictured a couple of posts ago?
Believe I will continue using the fluid specified by GM instead of gambling.
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It says DexIII, but I failed to mention Dex6, I guess they just assumed it was DexIII.
The water in sample was my fault, there was water in the tube of the pump I used to extract sample.
According to this, the Castrol doesn’t seem to be causing any issues. Kinda feels like you need everyone to agree that your way is the best and only way.
 

Caman96

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Bet few believe any "universal" fluid is better than the only fluid specified by GM.
Ford specifies Motorcraft, Dodge-Mopar, Toyota-WSA(Toyota Genuine), Mazda-FZ….ALL manufacturers specify their own brand.
They make “universal” transmission fluid because “many” universally use the same type of fluid.
Not only that, some manufacturers use the same manufacturer for their transmission’s.


Who Makes the 10-Speed Transmission for GM?​

The Hydra-Matic 10LXX transmission is a product of a collaboration between General Motors and Ford Motor Company. In Romulus, Michigan, GM produces a variant called Hydra-Matic 10L80.
 
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