Originally Posted By Pacnorthcuda
Originally Posted By 82firebird
The Lucas 80W-90 that I used exceeds service level API GL-5.


Don't use it again. As stated, find a GL-4. GL-5 has extreme pressure additives that are required for ring & pinions but are not compatible with brass (synchros) long term.

Redline makes several GL-4s


Thanks guys, I was under the impression that as long as the fluid exceeded GL-4 and GL-5, it would be safe to use. I have some Red Line MT-90 75W90 coming today that I will fill the transmission with.