I see the recommended oil is 40 weight motor oil. I used Hypoid.

what are you guys using 

Do NOT use anything for diffs, transaxles or anything marked "universal". They all contain hypoid additives (sulphur) which will damage any brass parts inside the transmission, namely the synchronizers. Use straight mineral oil only. Tractor Supply carries it under the brand name Traveler Ford Tractor Transmission Oil. NAPA Auto Parts also has it, but they may have to order it for you since it's not a high demand item these days.

Many modern hypoid gear oils are safe with yellow metals.  Read the bottle and check the manufacturers website.


Lawrenceville, GA

If he gets straight mineral oil no need to read labels and check websites. He can be assured it's the right stuff right off the bat. JMHO

For Borg Warner standard and overdrive transmissions, Dobie is giving you the correct information.  The B-W call for mineral oil has to do with a needed friction factor characteristic that makes the synchronizer hub and synchronizer blocking rings work the way the B-W engineers intended them to work.  Tractor Supply is where I have gotten the correct mineral oil lubricant, also.

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.

I question one item in the above manual.  On page 15 of the manual, item # 40-e suggests the use S.A.E. 40 or 50 engine oil in the overdrive unit!  I have NEVER seen that in print before.  Personally, I would NOT recommend the use of any grade of engine oil in the R-10 or R-11 overdrive unit.

Interestingly, on the same page 15 of the manual, item 40-f suggests in so many words that 'Straight mineral oil of the transmission type, S.A.E. 80 or 90 will also be satisfactory.'  I've ONLY used 80 or 90 weight mineral oil in the 1960 and earlier Borg Warner manual transmissions I've had or worked on.

Click the link below to see information Forum member Tazx100 posted pertaining to the Borg Warner Overdrive Manual AND comments others Forum members made about the posting.
http://forums.y-blocksforever.com/FindPost158999.aspx

Hope this helps!      


NoShortcuts
a.k.a. Charlie Brown
near Syracuse, New York

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

"I question one item in the above manual.  On page 15 of the manual, item # 40-e suggests the use S.A.E. 40 or 50 engine oil in the overdrive unit!  I have NEVER seen that in print before.  Personally, I would NOT recommend the use of any grade of engine oil in the R-10 or R-11 overdrive unit."

Use of these transmissions goes back to the '30s. I don't know for sure, but it's possible the OD on the early units was completely separate from the main trans as far as lubrication was concerned (no passage between the OD and main box). Could be BW just never updated the manual to reflect the changes. I think there also may be a reference in it to the reverse lockout switch which was deleted in 1950 or '51 in favor of the mechanical system that simply moves the planetary carrier out of engagement with the sun gear when reverse is selected.

Phil, is this oil also the one to use in the T-98 truck transmission?

Using a #40 - 50 motor oil isn't uncommon, even in the late 60's truck NP435 4 speeds call for #50 motor oil. Any 80-90 mineral gear oil is considered OK.
Just as a note: Gear oil and engine oil viscosity is measured differently and 80-90 is equivalent to 50 engine oil. I've been using 80-90 in all my trans since back in the 60's with no problem.
What you don't want to use is newer GL5 synthetic types or any for Hypoids. Newer trans that use GL5 types have blocker rings and not brass synchros.

I quickly looked over instructions. 23-b says that if lockout lever can be moved more than a 1/4 inch something is wrong.  Is that right or I'am  reading it wrong?  Bill Oregon