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Old 01-30-2023, 10:41 PM   #15
ninetres

 
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The Tremec fluid is much closer in cSt spec to the OEM fluid than many of the aftermarket Dexron 3 type fluids. It's seemed great in my car the past year or two, so I'm leaning towards running that again.
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Old 02-02-2023, 02:43 PM   #16
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GM put out a bulletin back in like 2007 that said that GM 88861800 replaced Dexoron III as the fill. There are better full synthetic alternatives that meet the spec such as Redline D4 or Amsoil. In the MSDS for this fluid, it lists the 100C viscosity at around 7.5 cST. Redline considers this 70w80 for gear oil https://www.redlineoil.com/d4-atf. I've had great results with Redline oils for MTs and rear LSD.
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Last edited by haggler; 02-02-2023 at 03:04 PM.
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Old 02-02-2023, 02:53 PM   #17
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Interesting thread. I've been using Amsoil Torque-Drive Synthetic ATF.

Kinematic Viscocity @ 100 C = 7.6
Kinematic Viscocity @ 40 C = 37.1
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Old 02-02-2023, 09:57 PM   #18
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Quote:
Originally Posted by haggler View Post
GM put out a bulletin back in like 2007 that said that GM 88861800 replaced Dexoron III as the fill. There are better full synthetic alternatives that meet the spec such as Redline D4 or Amsoil. In the MSDS for this fluid, it lists the 100C viscosity at around 7.5 cST. Redline considers this 70w80 for gear oil https://www.redlineoil.com/d4-atf. I've had great results with Redline oils for MTs and rear LSD.
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Originally Posted by RamAir02 View Post
Interesting thread. I've been using Amsoil Torque-Drive Synthetic ATF.

Kinematic Viscocity @ 100 C = 7.6
Kinematic Viscocity @ 40 C = 37.1
Both of those fluids (Redline/Amsoil) KV specs are essentially 50% thinner than the OEM fluid, as I understand it. I am not saying you are wrong by running it, shoot maybe it's better for some reason. But those cST numbers are vastly different from the OE recommended fluid (which is very close to the tremec fluid as far as cST KV specs).

The Dexron III and other aftermarket ATF specs are the outliers here.
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Old 02-02-2023, 11:28 PM   #19
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The TREMEC fluid is the outlier. The OEM fluid is DEXRON III. Dex3 is no longer licensed, so they changed to that other part #. I'm not saying the TREMEC fluid wont work perfectly, but based on the viscosity sounds like they are specing GL4 75W90.
This is the MSDS for the factory ACDELCO 10-4033 fluid mentioned earlier in this thread. The viscosity is right in line with DEXRON III @ 7.7 cst. Per another oil site ( google this part number and VOA (virgin oil analysis)), there is nothing special about the factory fluid. Since GM is providing the warranty and not TREMEC, if it were me I'd use something meeting Dex III. I've had great results and customer service from Redline, so I will use them for the trans and diff.
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Old 02-03-2023, 10:54 AM   #20
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Quote:
Originally Posted by haggler View Post
The TREMEC fluid is the outlier. The OEM fluid is DEXRON III. Dex3 is no longer licensed, so they changed to that other part #. I'm not saying the TREMEC fluid wont work perfectly, but based on the viscosity sounds like they are specing GL4 75W90.
This is the MSDS for the factory ACDELCO 10-4033 fluid mentioned earlier in this thread. The viscosity is right in line with DEXRON III @ 7.7 cst. Per another oil site ( google this part number and VOA (virgin oil analysis)), there is nothing special about the factory fluid. Since GM is providing the warranty and not TREMEC, if it were me I'd use something meeting Dex III. I've had great results and customer service from Redline, so I will use them for the trans and diff.
Can you link me to the specific SDS that you took that screen shot from. I am finding many of them floating out there that are seemingly for the same fluid. Here is another for example. I pulled this one from the GM SDS website.
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Old 02-05-2023, 08:46 PM   #21
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I have a little leftover 88861800 from my last change and will send it in for oil analysis to try and put this to bed. It could be it is still a Dexron III spec and the gmparts.com (AC Delco) link has the wrong info as a 75w-90. Since it is still an ATF red tint, I am thinking the gmparts.com info is wrong and its a Dexron III compatible oil.
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Old 02-07-2023, 12:14 PM   #22
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I dont think that MSDS is for the right part number. Nowhere on that sheet does it say any of the correct part numbers. Can you share where you found that? It looks like my previous screenshot was from a 2006 MSDS, below is the newest one I could find.

ACDELCO GM ORIGINAL EQUIPMENT 75W-90 MANUAL TRANSMISSION AND TRANSFER CASE FLUID - 1 QT
GM Part # 88861800
ACDelco Part # 10-4033
https://www.brandenburg.com/IphonePD...on%20fluid.pdf

Right at the top in small writing it says the correct part number. I have read elsewhere this is made by Petro canada as well.

Viscosity
Viscosity, kinematic : 34.26 cSt (40 °C / 104 °F)
7.7 cSt (100 °C / 212 °F)

More reading material:
https://bobistheoilguy.com/forums/th...3/post-5549117
https://bobistheoilguy.com/forums/th...861800.250384/

If you go to GM's part catalog, there is alot of "manual transmission fluid." I would only use the part number spec'd for this TREMEC unit if you're going with OEM fluid. In my case, I will use Redline D4 and its a valid replacement for GM part #88861800. Viscosity is around 7.5cst but full synthetic.
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5-6-22:1100,
7-19-22: 3000,
8-3-22: TPW 8/15/22,
10-4-22: ETA 10/13/2022
10-15-22 6000

Last edited by haggler; 02-07-2023 at 12:32 PM.
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Old 02-07-2023, 08:12 PM   #23
ninetres

 
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Quote:
Originally Posted by haggler View Post
I dont think that MSDS is for the right part number. Nowhere on that sheet does it say any of the correct part numbers. Can you share where you found that? It looks like my previous screenshot was from a 2006 MSDS, below is the newest one I could find.

ACDELCO GM ORIGINAL EQUIPMENT 75W-90 MANUAL TRANSMISSION AND TRANSFER CASE FLUID - 1 QT
GM Part # 88861800
ACDelco Part # 10-4033
https://www.brandenburg.com/IphonePD...on%20fluid.pdf

Right at the top in small writing it says the correct part number. I have read elsewhere this is made by Petro canada as well.

Viscosity
Viscosity, kinematic : 34.26 cSt (40 °C / 104 °F)
7.7 cSt (100 °C / 212 °F)

More reading material:
https://bobistheoilguy.com/forums/th...3/post-5549117
https://bobistheoilguy.com/forums/th...861800.250384/

If you go to GM's part catalog, there is alot of "manual transmission fluid." I would only use the part number spec'd for this TREMEC unit if you're going with OEM fluid. In my case, I will use Redline D4 and its a valid replacement for GM part #88861800. Viscosity is around 7.5cst but full synthetic.
MY MAN!!! I somehow missed those tiny part numbers on that Canadian document earlier. I'd say that settles it, pending the other member sending a sample in for analysis.

This is where I looked mine up, by searching "transmission", and selecting what seemed to be titled the closest. None of the documents contain the proper part numbers, and nothing populates searching them:

https://www.gmparts.com/technical-re...nt-disclosures
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Old 02-09-2023, 03:17 PM   #24
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The search function on GM's part website seems broken, I just went to the fluids by category. A regular 75w90 gl-4 might work fine given the official TREMEC fluid has a different viscosity, but I'd just use DexIII equivalent or even OEM since GM is the one on the hook for the warranty. I got a while yet before I do the change but this is one fluid you dont want to screw up.
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Old 02-11-2023, 02:23 PM   #25
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Personal experience with both redline and tremec manual trans fluids, is that redline d4 is good for cold weather, tremec not as good in cold, but smooth when is warm after driving for 20+ minutes or any day weather is above 60 F.



Redline d4 wasn't impressive on track during warm weather, i have yet to try tremec on the track in warm weather.
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Old 02-11-2023, 03:08 PM   #26
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Originally Posted by mano_camaro View Post
Personal experience with both redline and tremec manual trans fluids, is that redline d4 is good for cold weather, tremec not as good in cold, but smooth when is warm after driving for 20+ minutes or any day weather is above 60 F.
Redline d4 wasn't impressive on track during warm weather, i have yet to try tremec on the track in warm weather.
That lines up with the higher viscosity of the TREMEC fluid. But can u expand on why you didn't like Redline on track? Redline has another 75w85 or something similar to the TREMEC fluid that's dedicated MT fluid. I think I will call them when the time comes and ask. Their tech support is great which is why I like Redline.
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Old 02-12-2023, 07:35 PM   #27
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Quote:
Originally Posted by haggler View Post
That lines up with the higher viscosity of the TREMEC fluid. But can u expand on why you didn't like Redline on track? Redline has another 75w85 or something similar to the TREMEC fluid that's dedicated MT fluid. I think I will call them when the time comes and ask. Their tech support is great which is why I like Redline.

The Redline D4 on track in warm weather felt very notchy when shifting quick at even high rpms especially in third gear when it was warm after a few laps on a track cross.


I figured the reason being that because Redline it is a thinner oil, is good on cold, and the oem m6 trans fluid is a little better during warm season.
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