Transmission Fluid for F35

[finazzoty]

Hi all - what is the suggested trans fluid for an F35 non-LSD?

 

[Ross]

I use Redline MT-90 Manual Trans Fluid in my transmission. Both before and after I got a Quaife LSD. Didn't think about checking if the Quaife requires a different oil, but now you have me wondering if I need a different oil.

 

[finazzoty]

From what I’ve read, the diff is sealed, so it’s not affected by the fluid:

Finally: Organized F35 transmission fluid thread - Cobalt SS Network

Drivetrain - Finally: Organized F35 transmission fluid thread - Well, while I was away, I was still reading around on the forum, and I finally noticed.. Here in the drivetrain section, we don't even have a sticky thread, with given information, for the F35 (SS/SC) transmission fluid, or even for...

www.cobaltss.net

Sounds like MT-90 is the way to go…I think

 

[jirwin]

I too was wondering this. F23 with Quaife should be done this week. I kinda just assumed anything is better than the conventional oil normally found in an F23. I think the F35 is synthetic. Its been a while since I looked at it now.

 

[Robinjo]

I just used GM fluid for a Cobalt but I don’t have the LSD

 

[finazzoty]

Silly I didn’t notice this before:

Redline MT-90 Manual Trans Fluid

This is a great upgrade for your manual trans! This is one of the easiest "mods" to do for your trans. Drain old fluid, pour this in. The trans will shift quicker, feel less notchy, less wear on its components, etc!

zzperformance.com

If ZZP lists it for use with the F35, I trust it

 

[jirwin]

I'll call them tomorrow and ask about the F23 because now I'm curious

 

[jirwin]

Called ZZP the other day and they didn't answer. Left a message.

Did some searching and found this: https://www.fiero.nl/forum/Forum1/HTML/087296.html

Says my late model F23 uses DEXRON VI ATF. So I'm thinking I can just run Redline D6 ATF: https://www.redlineoil.com/d6-atf

 

[Desert Sasqwatch]

From what I’ve read, the diff is sealed, so it’s not affected by the fluid:

Finally: Organized F35 transmission fluid thread - Cobalt SS Network

Drivetrain - Finally: Organized F35 transmission fluid thread - Well, while I was away, I was still reading around on the forum, and I finally noticed.. Here in the drivetrain section, we don't even have a sticky thread, with given information, for the F35 (SS/SC) transmission fluid, or even for...

www.cobaltss.net

Sounds like MT-90 is the way to go…I think

F40 Quaife - not sealed - uses 75W90 synthetic gear oil, per Quaife information (no friction modifiers).

Have to believe the Quaife for the F35 and F23 are also not sealed, that they have openings for gear oil to flow into-through-out of to lubricate the helical gears.

 

[ATMironov]

I just replaced the fluid in my F35 with LSD.
I called the dealer and asked for PN 88862472 per the form link above and they said it was replaced by 19351859. So I used that.

 

[Rauq]

"When running a Quaife ATB Differential in a standard transaxle gearbox, we recommend you use the oil recommended by your vehicle’s manufacturer – the Quaife ATB Differential does not require any special lubricants." https://www.quaife.co.uk/customer-service/technical-support/

 

[Scott #321]

I used BG Syncro shift II in both the f35 and F23 https://www.bgprod.com/catalog/driveline/bg-syncro-shift-ii/
Make absolutely sure you use a GL-4 API fluid as GL-5 gear oil will destroy the synchronizers in the transmission. When in doubt you can't go wrong using the specific GM product.