Do not use GL5 in that transmission. It corrodes the bronze synchros. There is a TSB on this.
Use only Stalube GL4,or Redline MT1. I've mixed Synchro with GL4 before. I run MT1, but as all synthetics it can cause leaks. In my warm localtion GL4 would have been best choice.

Last edited by KrzyDav; 03/13/14 12:28 AM.
dave h.
'89 Raider V6 5spd;Aisin Hubs;; Gen2 LS: frt. brakes, rear coils;U.C.arms;R.trailing arms;idler arm; rear LSD axle w.disc brakes ;2 battery system for Dog's fan; relocated ECU; custom bumpers;J.Baker receiver;Conferr roofrack; t-bar crank.