New Tremec MTF 75/85 GL4 Trans Oil - Dodge Challenger Forum: Challenger & SRT8 Forums
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post #1 of 59 (permalink) Old 03-17-2019, 08:13 AM Thread Starter
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New Tremec MTF 75/85 GL4 Trans Oil

New for 2018.

http://www.tremec.com/anexos/2018_Pe...duct-Guide.pdf

Has anybody tried this yet?

Summit sells a 4 qt pack for $90.

They are going from a Dexron ATF to a GL4 75/85.
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post #2 of 59 (permalink) Old 03-17-2019, 09:36 AM
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Developed for our transmissions by the company that designed and manufactured them. First I have heard of it. But it does interest me. Makes me wonder what's different about it vs ATF+4 for our application.


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post #3 of 59 (permalink) Old 03-17-2019, 09:36 AM
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Well at ~$22 per quart I am more inclined to try Amsoil. I have read guys switching from RP to Amsoil to reduce notchy 2nd gear shifting.

Amsoil - 1 quart $16.15
https://www.amsoil.com/shop/by-produ...n-fluid-5w-30/

https://www.bobistheoilguy.com/forum...Number=2329718 -- interesting, according to Amsoil site they recommend ATF not syncromesh.

Not much info on the Tremec oil from BTOG.
https://www.bobistheoilguy.com/forum...tf-no-more-atf


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2015 Challenger RT+ (non-STP)
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post #4 of 59 (permalink) Old 03-17-2019, 09:58 AM
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Just looking at the specs, this is some thick stuff compared to ATF+4.

Kinematic viscosity
Tremec MTF: 12.1 cSt @ 100°C, 71.6 cSt @ 40°C

ATF+4: 7.5 cSt @ 100°C, 34.4 cSt @ 40ºC

Not sure I'd want to use that in winter, unless I had a heater for my trans fluid. I bet it just turns to molasses at -40. Even the ATF + 4 does. Might be a good thing for summer though!

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post #5 of 59 (permalink) Old 03-17-2019, 02:42 PM Thread Starter
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Originally Posted by BlackHemi41 View Post
Just looking at the specs, this is some thick stuff compared to ATF+4.

Kinematic viscosity
Tremec MTF: 12.1 cSt @ 100°C, 71.6 cSt @ 40°C

ATF+4: 7.5 cSt @ 100°C, 34.4 cSt @ 40ºC

Not sure I'd want to use that in winter, unless I had a heater for my trans fluid. I bet it just turns to molasses at -40. Even the ATF + 4 does. Might be a good thing for summer though!
Somewhere I read that its not recommend for winter, but thats ok, I have other vehicles for winter.
I'm just glad to see Tremec actually publish GL4 and 75/85. Now that gives me some options to try.
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post #6 of 59 (permalink) Old 03-17-2019, 05:04 PM
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Quote:
Originally Posted by Desertdawg View Post
Somewhere I read that its not recommend for winter, but thats ok, I have other vehicles for winter.
I'm just glad to see Tremec actually publish GL4 and 75/85. Now that gives me some options to try.
Let us know how it goes if you try it.
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post #7 of 59 (permalink) Old 03-19-2019, 01:14 AM
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BTW for RT/SP owners the fill capacity is 3.4 quarts, for HC owners it is 4.2 quarts per the service manual. Be careful of other sources as they make no distinction between the fill levels, such as the info from american muscle (they also state the synchronizer material is carbon particle paper...I though they were bronze)

Also apparently the MTF is a synthetic blend. And one of guys on the SVT forum makes it sound like it's not work the money.
https://www.svtperformance.com/threa...fluid.1166800/
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post #8 of 59 (permalink) Old 03-20-2019, 06:32 AM
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Is this their final answer to the notchy, crunchy, awful second gear pull that's been plaguing TR-6060 owners for the last 15 years?

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post #9 of 59 (permalink) Old 03-20-2019, 08:27 AM Thread Starter
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Is this their final answer to the notchy, crunchy, awful second gear pull that's been plaguing TR-6060 owners for the last 15 years?
Gosh I could only hope. I have driven manual trans vehicles for 49 years now. Up until 2 years ago all 4 of my vehicles were MT. But getting close to 65 I decided I'd better get an auto for my daily driver.

My 57 Chevy with M22 always handled it
My 66 Ford with 335,000 miles never ever missed a shift
My 1974 VW Camper Bus still shifts fine at 45 years old
My 2000 2500 Ram Cummins, to this day shifts flawlessly, even when its -10 outside, and or with a 10,000 lb boat attached

This Challenger tremec MT has me spooked. The grinding into second at times is embarrassing, especially when it happens in front of your neighbors :-(

I have changed the way I drive, when I first leave the house, I just start off in 2nd. Actually works out well, saves a shift before the stop signs. After 10 miles once she is warmed up, then there is no issue.

Syncro transmission technology is not a new thing, so to experience this problem today is odd. I think I may end up installing some better syncs rings?


Last edited by Desertdawg; 03-20-2019 at 08:29 AM.
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post #10 of 59 (permalink) Old 03-20-2019, 12:51 PM
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I've never had any issues with stick shifts either and have beat the absolute hell out of A-833's.

I don't miss shifts in my car since installing the Hurst shifter and linkage and deleting the CDV. The crunchy feel going into second at normal speeds is just annoying to me. I literally was reading about it yesterday and ordered 4 quarts of Amsoil to try out when I take the car out of hibernation to change the rear end fluid as well. I saw this today and couldn't believe the timing. I'll let everyone else try it first.
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