Redline MTL would be one of the very best choices possible for your particular transmission. It's available on Amazon and Summit Racing among others. Don't bother looking for it locally.
I can't recommend Synchromesh from Pennzoil or GM, not many like how the transmission shifts after using it.
I've used penzoil, GM and several others. I never noticed any improvements switching from one brand to another. You do know that syncromesh is just 5w30 oil without the additives.
While I also use Pennzoil synchromesh with no issues, Jerry B knows that others have had issues with it.
And water is just like beer without the additives.
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