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Levee
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Ok, I will first start off by saying, I did NOT write this, nor did I even take part in helping to write this. This was a write up done by another member from a different forum who will take all the credit. Please do not credit me for this as I'm posting this for informational purposes only. That being said:

We need to offer correct information for people on this forum who are in search of learning about this car.

On to the information..

1) The F35 (SS/SC) does take a 75W-90, GL-4, transmission fluid.

2) You DO NOT, I cannot make this any clearer, DO NOT, want friction modifiers! The friction modifiers will not allow the synchronizers in the transmission to work properly. This goes for BOTH the SS/SC and the SS/TC.

3) As for the limited-slip.. Ours are sealed. They are "Quaife ATB" differentials, and the lubricant does not affect them. AT ALL! This is why you DO NOT need limited-slip additives! This goes for BOTH the SS/SC and the SS/TC.

3a) *Side note* - This is why the How-To, (On this forum), is incorrect. The OP used 75W-90, WITH limited-slip additives. He is throwing differential gear fluid, in his transmission. The fluid is too slippery for proper synchronizer operation.

4) Even though the F35 comes with GL-4, you might want to use an aftermarket GL-5, if you feel need be. You can, although, make sure it is the correct specs as mentioned above! MOST GL-5's meet or exceed GL-4 specs.

5) The F35, (SS/SC) transmission, comes with fluid part number 21018899.. While The F35, (SS/TC) transmission, comes with fluid part number 88862472.

6) SS/TC guys, I would ABSOLUTELY NOT run anything other than part number 88862472, this is the most current GM fluid for your transmission.

7) SS/SC guys, feel free to use part number 88862472, in fact, I HIGHLY recommend it. It is a 75W-85 GL-4. It is the new "standard", over the old 21018899.

8 ) IF you feel the need to go aftermarket on the fluid, the ONLY fluid I recommend is - Red-Line 75W-90 NS GL-5 Gear Oil, and I ONLY recommend it for the SS/SC guys. You NEED 75W-90 NS, if you plan on using this fluid, because there is regular 75W-90, which has friction modifiers. It does not matter if you have G85 or not. Like I said earlier, our limited-slip is a sealed unit. No fluid you put in there, will see it.

9) DO NOT use Royal Purple, or any of that synchromesh garbage. Either stick with the 2 factory numbers I provided, or the Red-Line fluid. NO IF'S AND'S OR BUT'S!!

10) The transmission fluid should be changed around, in my opinion, 60k. As for the amount, you will need to buy 2 quarts. However, it will only take 1.7 quarts.

11) The code for the SS/SC transmission is F35-MC2. The code for the SS/TC transmission is F35-MU3.
 

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wahts the best manual transmittion fuilf for chevrolet cobalt lt 2009 ?
Manual Transmission Fluid GM P/N 88861800. The fluid can be found online in multiple places my favorite is Crate Engine Depot, but you can go to dealer's parts department and order it as well. You will need to buy 2 quarts. You will use approximately 1.7 quarts for a drain and fill for the F-23 Getrag 5-speed. The link below is the fluid from CED
http://www.crateenginedepot.com/Search.aspx?k=88861800

On the driver side there will be 2 Plugs. The top is the fill plug the lower is the drain plug. The plugs use an allen wrench to open them. Once you find the right size you might have to grind down the short side of the allen wrench to get it to fit between the trans mission and the subframe.

Get the front jacked up and remove the driver side front wheel.

1. Open the top plug first. I say this because if you open the drain plug first then try to open the fill plug and strip it out or can not get it open you will be screwed with a transmission that has no fluid in it.

2. Get a drain pain that can hold atleast 2 quarts.

3. Open the lower plug (drain plug).

4. Close the lower plug.

5. Fill with about 1.7 quarts of fluid. When filled, fluid level should be at the bottom of the fluid check plug hole. (You will know it is full when fluid starts dripping out).

6. Close the top plug (fill plug).
 
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