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While I have my 1808 off the floor, thinking about changing the rear overdrive seal. It weeps just a bit. In the past I have used gl4 140 sta lube gear oil. The manual suggests a 90 to 140 closer to 140 in warmer climates. I am in Las Vegas, definitely warmer. Need the latest thoughts, I can stay with the gl4 140, or I see a Lucas Gl5 90 to 140. Or see many 90 to 140 synthetic oils. What is the current set up for transmission gear oil? Thanks

What I use in my ‘40 160 with OD

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Joe's right as rain. That's exactly what i use in my '47 Super Clipper's overdrive transmission, essentially the same drivetrain as your and his '40 One-Sixties. GL-5 is fine for the differential. Check the overdrive and transmission levels separately.

This subject's been covered on these forums what, 127 times?

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