The Ford Barn - rear end oil

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mgerhold

10-18-2020 08:38 PM

rear end oil

what should i use for rear differential oil in my 1953 mercury? can i use the Lucas 80w90 gear oil without any problems?

Clem Clement

10-18-2020 08:47 PM

Re: rear end oil

Is it GL4?

mgerhold

10-18-2020 08:54 PM

Re: rear end oil

its says it exceeds gl5. do i need to run gl4 gear oil?

Talkwrench

10-18-2020 09:38 PM

Re: rear end oil

No you dont in the diff.

JSeery

10-18-2020 09:38 PM

Re: rear end oil

Quote:

Originally Posted by mgerhold (Post 1942948)

its says it exceeds gl5. do i need to run gl4 gear oil?

Not in a rear axle, GL5 is a transmission issue, not a rear axle issue. High EP additives can attach "yellow" metals, like those found in a transmission. That should not be an issue in a rear axle.

mgerhold

10-19-2020 09:56 PM

Re: rear end oil

ok so using the Lucas 80w90 gear oil in the rear axle should be fine. just wanted to make sure.

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