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Proper gear lube for Muncie SM465 with brass
After rebuilding the transmission I filled it with the proper weight/rating gear lube. Later noticed that the container was labeled "GL-5 rated". Now i have seen that the GL-5 lube will be hard on the brass synchros in there - supposedly will eat them up. The lube has been in there for a few weeks, but have driven the truck only about 50 miles.
I will change the lube as soon as possible, but so far have not been able to find the older GL-4 lube at any of our independent parts stores or at the "duh" chain stores. I did find LUCAS Universal Hydraulic and Transmission Fluid and the label says "meets API GL-4" requirements.
Two questions for those in the know:
1. Is that Lucas product good and proper for this Muncie with brass synchros?
2. How much "damage" might I expect to that brass from this short period/usage?
Thanks for any help>
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