Hello folks,
I have specific and general questions about gear oils.
Application is an '83 GT 5.0L 5-speed. I don't have my shop manuals handy, so what is the correct gear oil for the 7.5" axle with limited slip differential? What is the correct lubricant for a non-world class T-5?
Kind of a general question here... application is 1968 F-250 360 NP435 4-speed and Dana 60 limited slip axle. I have read online about GL-4 and GL-5 gear oils. Is this a classification of gear oil like the API rating for engine oils? My understanding is that the NP435 4-speed would require a GL-4 gear oil (I believe 90w was originally called for) because this older transmission has materials in it that GL-5 does not sufficiently protect ("yellow metals" is a term I see frequently).
Additionally, I don't think that an axle would be picky about GL-4 or GL-5 specification lubricant... would it? Seems like the ring and pinon gears won't care too much about what oil is in there, provided there IS oil of the correct weight.
If someone could provide some clarification I would be greatly appreciative!
Thanks guys,
Michael
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