As mentioned, Napa has gl 4... stalube brand.

Correct me if I'm wrong... but synchromesh isnt gl4. Gl rating is a gear oil specification. Synchromesh isnt gear oil. Its a GM transmission product. If anything its closer to the atf family, if anything at all. Not saying its a bad product... want to put it in my mustang and all, just pretty sure its not gl4.

88 Montero, StarQuest turbo, Kormex 5speed +tuff-pan w/phoenix f. stage2 clutch, 4in lift+33' tires, 4.875 lsd, short-throw shifter, Aisin hubs, SR big brakes, gen2 uca's, elantra alt, and so much more... 16g turbo w/hardpipes + 4.90 locking disk-brake axle soon (maybe lsd or aussie front??)