What Manual/T56/M12 transmission fluid is everyone using? - Pontiac GTO Forum
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post #1 of 6 (permalink) Old 03-25-2014, 04:54 AM Thread Starter
 
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What Manual/T56/M12 transmission fluid is everyone using?

I've been using basic Dexron 3 for about 2 years and 10k miles but it definitely feels pretty notchy. This seems to be pretty common/normal. I've read about so many different people recommending so many different fluids (basic dexron 3, dont use Royal Purple synthetic, do use Amsoil, redline, mobil1 atf, syncromesh etc) I dont know what to think.

It would be nice to know what fluid everyone here is using, for how long(time/mileage), how it feels and if they have any other fluids to compare it to?
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post #2 of 6 (permalink) Old 03-25-2014, 06:33 PM
 
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Well Im going with Redline D4 atf it is highly recommended by them & a lot of people on the corvette forums swear by it in there 6 speeds ...
I bought 6 qts going to fill it till it runs out of the back up switch hole ..
Red Line Synthetic Oil - Automatic Transmission Fluids - D4 ATF
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post #3 of 6 (permalink) Old 03-26-2014, 08:56 AM
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I've been using Syncromesh with no issues.
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post #4 of 6 (permalink) Old 03-27-2014, 05:13 AM Thread Starter
 
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SIXO GTO, Redline is near the top of my list.

MWR, is that GM Syncromesh or another brand? Ever used anything else in there?

Today I just took a wiff of some GM syncromesh and smelled almost exactly like ATF. I suppose its just ATF with a friction modifier in it for the syncros?
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post #5 of 6 (permalink) Old 03-27-2014, 06:42 AM
 
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Quote:
Originally Posted by bigdeezs View Post
Today I just took a wiff of some GM syncromesh and smelled almost exactly like ATF.
It is ATF. If I recall correctly they sell it with and without FM. I've also seen it with an AC Delco label and different part numbers but I'm fairly certain it's the same stuff.

2005 Pontaic GTO - CGM 6 Speed (My car)
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post #6 of 6 (permalink) Old 03-27-2014, 10:10 AM
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Originally Posted by bigdeezs View Post
SIXO GTO, Redline is near the top of my list.

MWR, is that GM Syncromesh or another brand? Ever used anything else in there?

Today I just took a wiff of some GM syncromesh and smelled almost exactly like ATF. I suppose its just ATF with a friction modifier in it for the syncros?
I get mine right over the GM parts counter.
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