Last week Tazx100 posted a Borg Warner manual filled with GooD, A-Z information regarding the operation, maintenance, and servicing of the B-W R-10 and R-11 overdrive units.

What year was that publication released? I think lubricant tech has changed a little since then.

Similar to the TYPE A ATF discussions.

1957 LUBRICATION CHART -




READ THIS - https://carnesmechanical.com/best-manual-transmission-fluid/

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That's the way I read it, too. However that section is in reference to a misalignment of the OD to the main case when new. Unless yours has been apart and improperly reassembled causing a misalignment and everything works properly I wouldn't worry too much. These transmissions were last installed in new vehicles about 50 or so years ago, so there's bound to be some wear.

What I find interesting in the lubrication chart it shows lubricant B6A 19580 B  for both rear axle and transmission..

I am not familiar with that transmission.   BW overdrives have been used in Ford vehicles since the thirties. The O/D transmission lubricant issue has been covered on this forum numerous times.  Experts tell me there is an issue with modern lubricants and older synchronizer materials and I was advised to use the tractor oil.  It's cheap and easy to find.   I have been using it in my T86-R10 transmission for about four years and I haven't had any problems.  Incidentally, I have rebuilt both T85-R11 and T86-R10 transmissions in my home garage.  Both have joined lubricant reservoirs. The proper way to fill them is to remove the side plug from the overdrive unit then fill the side of the main unit until the overdrive unit runs out.  That way you know both are full.  You could do that in reverse order, but it's hard to force oil into the O/D side.

One thing anyway learned from that chart:  It never occurred to me before to lube the hood/trunk hinges. I should also do all the locks soon. Can’t imagine how I’d get the trunk open if that one failed (I already was nearly stranded once when the ignition lock broke, so should have learned then).

6 VOLTS/POS. GRD. NW INDIANA

What I find interesting in the lubrication chart it shows lubricant B6A 19580 B  for both rear axle and transmission..

That is what I was trying to get across. That is 1957 SPEC. Can you imagine how far LUBRICANTS have come just from 1957?

It is not advisable (IMO) to rely on a LUBE CHART fifty-tears old.

Read This Ad -
It is GL-4 and is safe for copper alloys. This is just one refiner. This is a modern lubricant.

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This is the oil you want to use in your transmission. You can buy it at Tractor Supply

I think that fluid and usage is a little out of date - 1939-1952
https://www.tractorsupply.com/tsc/product/traveller-ford-tractor-all-mineral-90-transmission-fluid-2-gal

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BUT, it's the type and viscosity, 90 wt. GL-1, specified by BW for our transmissions. I've been using it for decades in BW OD transmissions with never an issue regarding the oil. I think whoever makes Traveller needs to update the label.

Many of the newer lubricants are designed for newer trans, not like the old trans we use. I had learned from doing some investigation not to use GL5 and later synthetic oils and this was confirmed by a top builder of rear gears that I talked to when I had them rebuild my rear gears. Synthetics have additives that can either harden or soften old style rubber seals.

Yeah, newer manuals don't have any brass parts inside.