[UnknownJinX]

Originally Posted by N Camarolina

I just verified again, straight from the Tremec website data sheet for the TR6060 that the trans lubricant called for is Dexron III ATF.

I agree that the Tremec fluid is heavier grade than ATF (see my posts above in this thread, as I believe we are both making the same point on this), but so is the GM OEM flui (you can pull the current safety datasheet on the AC Delco site as I did the other day). In fact, the Tremec and GM fluids both have about the same kinemetic viscosity ratings at 40c and 100c.

So either Tremec is specifying the wrong viscosity fluid in the TR6060 data sheet (shouldn't say Dexron III ATF as it currently does, and perhaps should call for 75W/85) or the GM and Tremec fluids are incorrectly too viscous for the TR6060 trans and we should be using ATF. Do you know which is the correct answer?

You are probably referring to this sheet.

https://public.spheracloud.net/Pdf/1...1753410844.pdf

The part number turns out to be a Canadian part number and is superseded by another part number, 89021806.

https://www.tubmangmpartsdepot.ca/p/.../19354436.html

This turns out to be an ancient GL-3 Manual Transmission Fluid. It isn't even compatible with most modern manual transmissions(which would need GL-4 MTF), let alone TR-6060.

https://www.coloradofans.com/threads...s-stuff.81549/

So this means the SDS I posted in my earlier reply would be the factory MTF. The part number for the stock fluid that comes with our V8 M6 is 88861800, if you want to do some research. It's supposedly just ACDelco's Dexron III with a different name.

https://www.corvetteforum.com/forums...8861800-a.html

In this case, HP-MTF is the odd one out, actually. As noted before, it's not supposed to go into any auto trans, unlike the other Dexron III fluids that can go into auto trans requiring Dexron III.