I've been wondering weather ou trannies have brass syncros or not. cuzz if we do, i have the rong fluid in there. Im using gl-5 stuff. I have a tranny out of an 80 280zx. one of the early 5spds. do all the l series tranny have brass syncros? or no? and wat types of gear oil are u guys using?

Redline MTL. Yes you have brass syncros. Your 1980 transmission (B box) differs from the A box 5 speed used in non-US market Z cars and all SRL roadsters. The A box used steel "Porsche style" servos (syncros) for all gears up to 1970. After Nissan fitted 1~2, 2~3 with brass "Warner Style" syncros

kool, thanks gl-5 is contains sulfer which is bad for brass.

I use SWEPCO gear oil in my trans and differential. Great stuff...visit their web site.

Redline or Royal Purple. Currently its Redline, and has been an improvement.