I put the GM synchromesh about two years back. I plan on changing it this summer and am going to try Redline Synthetic manual transmission oil. I have a stock T-5.
------------------
88GT 5-speed
Mods: Cervinis Ram air hood 3.73 gears, King Cobra clutch, Pro 5.0, March alum. Pullies, DynoMax Cat-back, WMS Xtrac subframes, 16" Ponies.
"Nip it in the Bud"
My Webpage