Tremec fluid

I'm due for a tranny oil change & I know that you're supposed to use GM's syncromesh.

My problem is that the GM dealer near me seems to have morons working at the parts counter. I neeed the GM part # for the correct syncromesh tranny fluid.

The total buffoon at the parts counter said after I had asked him for the syncromesh "all trannys are syncromesh". I'm like, duh, no kidding. You sell trannny fluid called "syncromesh".

He couldn't figure that one out so I said that I'll get back to him with a part # (so he can't mess it up!)

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91 coupe
3.73's,long tubes,2 1/2" exh,ported stock t-body,ProM-77mm
cobra intake,edelbrock heads,B303,1.72 rr's
36lb inj's,tremec, & a Paxton NOVI 2000!!!
11.020 @128.95 on BFG Drag Radials (275/60/15)