Hi Terry

That should be fine.

I have a 1929 Chev and I have been running Shell GL-5 85W-140 with no issues.

Some will say not to use GL-5 in old transmissions with brass/bronze bushings in them.

That was true many many decades ago, but modern GL-5 oils are buffered so they are safe to use.

When Gene Schneider was posting here, he always said he agreed with this and used GL-5s in his own cars.

PS

It looks like you also have a 1950 car.

To simplify things for yourself, 80W-90 should work fine in the '37 as well.

If I had both a '37 and a '50 and wanted to pick one oil to cover both, it would be the GL-5 80W-90.

Thanks Ole, I think you have covered both of my 37 & 50 questions. 

Since I just changed the 37 yesterday with the 85w-140, I'm thinking I will try using the Lucas 10046 Sae 80W-90 Heavy Duty Gear oil on the 50 pending change with the goal of eventually having them use the same.

Thanks again.

Here's a discussion about transmission oils on the old forum (vccachat.org) with more info and opinions: https://vccachat.org/ubbthreads.php/topics/368202/sae-160-transmission-oil-1937.html

Cheers, Dean

Thanks Dean, having the old forum I can see both sides of using 85w-90 or 85w-140.

After thinking about switching to Lucas or Valvoline, I am now considering VP Classic Gear Oil GL4 SAE 80W-90