Anyone ran 75w90 for tranny oil?
 

So I'm about to change diff and trans oil within a few days.. Read that everyone likes redline for trans but has anyone just used 75w90 for it? Was hoping to pick up what I need locally.. Which I'm assuming isn't redline anything. I saw that gl5 is bad for the synchros so just trying to figure out exactly what to get. Car has 30k, and I bought it with 25 and thought it shifted rough since then.