Transmission Fluid for G1 & G2

jkroberts21 · Oct 2, 2024

Amsoil recommends an automatic transmission fluid for the gen 1: AMSOIL Signature Series Multi-Vehicle 100% Synthetic Automatic Transmission Fluid
I even called them to confirm

But for the gen 2: AMSOIL 75W-90 Manual Transmission & Transaxle Gear Lube

Has anyone used AMSOIL automatic transmission fluid in their gen 1?

GTS Dean · Oct 2, 2024

The Gen 1s had different blocker rings in the synchros and require a Dexron III or better ATF fluid. The Gen 2s have carbon rings and can work well with GL4 multigrade synthetics for track or warm weather use.

serafins · Oct 3, 2024

Use a good 75w-90, just avoid GL5 rated fluids. I used anything I had on the shelf, 2qts redline GL4, 1qt BG synchroshift, 1qt auto trans fluid. Figured the auto trans fluid would add a little detergent capability to the mix and balance out the thicker synchroshift. A manual trans is very simple and will be fine as long as it’s got clean fluid and nothing that will eat internal parts like GL5

daveg · Oct 3, 2024

I went back to Dexron III, shifts much better now. If you get NGR, its not harmful just something you may hear.

A simple search reveals

AMSOIL vs MOPAR (Transmission Fluid)

Do you all have any experience or words of wisdom for AMSOIL vs MOPAR for transmission fluid? https://www.amazon.com/dp/B00BV4D182/ref=cm_sw_r_cp_api_fab_fgrBFbHNBMVVX vs https://www.amsoil.com/p/manual-transmission-transaxle-gear-lube-75w-90-mtg/?code=MTGPK-EA

www.viperclub.org

Goggles Pizano · Oct 6, 2024

Read sticker on tranny.
Do not use synthetic oil.
I posted this on multiple threads here and there is tons of threads about this

Monopoly · Oct 6, 2024

Using Amsoil 75-90 and it says on the bottle Chrysler* MS-9070 replacement. 3000miles feels great.

jkroberts21 · Oct 6, 2024

Goggles Pizano said:
Read sticker on tranny.
Do not use synthetic oil.
I posted this on multiple threads here and there is tons of threads about this

Goggles, you're referencing a G2 yes?

Goggles Pizano · Oct 8, 2024

jkroberts21 said:
Goggles, you're referencing a G2 yes?

Yes T56. The paper blockers don't like synthetic. The T56 was a Borg-Warner and Tremec buy Borg-Warner and continued production.

steve e · Oct 29, 2024

On my 1999 GTS, the service manual says to use ATF +4 , so I use Amsoil multi vehicle full synthetic trans fluid that's there top of the line transmission fluid, any type of gear oil is not recommended and will make the transmission harder to shift in colder weather . Use the fluid your service manual recommends, then upgrade if you like but keep it the same type, so instead of Mopar ATF+4 I upgraded to Amsoils version of that type of fluid, owned a auto repair center for 40 years and rebuilt thousands of transmissions of all types, and taught Auto tech so your hearing this from a qualified technician.

efnfast · Oct 29, 2024

What is the recommended fluid for a 2002? Some sites say 75-90 GL4 (e.g., Amsoil), others say use Mopar ATF+4.

daveg · Oct 31, 2024

Whats the Tag say?

efnfast · Oct 31, 2024

daveg said:
Whats the Tag say?

There's a sticker that says use Syntorq

daveg · Oct 31, 2024

efnfast said:
There's a sticker that says use Syntorq

There ya go.

efnfast · Oct 31, 2024

daveg said:
There ya go.

Except they don't make Syntorq anymore and there's no consistency about what to use when I read online posts for Gen2 transmissions

daveg · Oct 31, 2024

Just use a good compatible oil.

https://www.amsoil.com/p/amsoil-75w-90-manual-transmission-transaxle-gear-lube-mtg/?code=MTGQT-EA&gad_source=1&gclid=Cj0KCQjw1Yy5BhD-ARIsAI0RbXZk1_rWGLmzCCBDPa0_VtEuhhxvLkEeHb4pwZn4xOMjIKMEE2XbKLMaAi5LEALw_wcB

GTS Dean · Oct 31, 2024

And make sure it is rated GL-*4*, not 5.

daveg · Oct 31, 2024

GTS Dean said:
And make sure it is rated GL-*4*, not 5.

^^^^^^^^^^

MoparMap · Nov 1, 2024

For what it's worth, I emailed Tremec and asked them the same question regarding what to use since SynTorq is out of production. They said ATF is fine. I think they recommended Mobil 1 ATF, but guessing any good quality one would work. T56s are in everything and I think the vast majority use ATF of some variety. I never knew what the neutral gear rattle (NGR) was until I put a T56 in my 67 Dart. I believe it was out of a Gen 2 and had the Dexron sticker on it, so that's what I filled it with and it's noticeable the noise it makes before you put it into gear. I think Mopar had a TSB about swapping from ATF to the SynTorq to reduce this noise, so they must be compatible to some degree. Maybe not the early cars, but would have to dig through the TSBs to see what it actually applied to to know for sure.

lane_viper · Nov 1, 2024

For what its worth I use Syncromesh MT fluid in 3 of my Manual cars, 2 T56's and the S2000.

S2000 has 197k
C5Z has 145k
Viper has 97k

I did have to do rebuilds on the T56's and used syncromesh after the rebuilds. I bought the cars used and have been running them with Sycnromesh under my ownership.

The C5z has more miles on the rebuild with Syncromesh that id did origiinally.

The viper has 10Kmiles on the rebuild.

I've owned S2k for 17years, and it has over 100K miles with Sycnromesh.

Its readily available and cheap, and has served me well with my cars.

ELW98 · Dec 21, 2024

98 RT Been running Amsoil 75-90 MTL for over 21years LOVE IT!

matt dillon · Tuesday at 4:54 PM

ELW98 said:
98 RT Been running Amsoil 75-90 MTL for over 21years LOVE IT!

This is what I've heard also & I plan on using it the next time I change out my transmission fluid

Transmission Fluid for G1 & G2

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