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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?

BigKev provided a nifty, easy Search bar on the upper right of this fine sites' homepage.

This is what I use as well. Recommended by Ross to keep transmissions happy. This is standard GL1-90W. No friction modifiers that can make old transmissions unhappy.

ok, will go to the napa 90gl1 thanks Available at napa a couple miles from me.

Greetings from Idaho,
I could not find any mineral gear oils within the USA, but felt lucky to find Millers oils which are Proudly engineered in the UK. WWWW.millersoils.co.uk. Very spendy! Purchased over a year ago, so I don't remember the Vendor's name. Hope this helps.

Packard Mack, as discussed above, Napa's GL-1 90W is a mineral oil with a defoamer. No need to go all exotic!