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Dex III is what it uses but the DexIII license ran out in 2006. GM changed to the GM Genuine Manual Transmission Fluid Part #88861800 .

4.6 quarts filled thru the reverse light sensor on the passenger side of the trans.

Here's a link to fluid on summit. Thats where I got mine from.

https://www.summitracing.com/parts/ADO-10-4033
 

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You're free to run what ever you'd like.

The manual says GM #88861800 for GM T-56 manual transmissions. It's $6.75 a bottle. Do you really want to take a chance putting a random fluid in your trans?

I did mine a year ago and it's still smooth as butter. And I beat that absolute piss out of my car, respectfully of course :)
 
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