1950 O/D Trans and Differential lubricants

[Jimmie]

I am quite sure that there is a thread about lubricants but didn't find it with a search[:I]. Therefore I have some questions which most likely have been answered before[:I].
[8]I didn't realize that it was going to take over two years before I would be ready to put the lubricant in the car[8].

I read in my manual after I had put some extreme pressure lubricant in my O/D that I should not use it[:0].
Since I am still working on the car, I have not driven it with the incorrect lubricant in the transmission.

Will just opening the plugs and draining the two sections of the transmission be enough or should I wash/rinse it out before adding the new lubricant[?]
I am planning on using 40 Weight Engine Oil now unless someone has a better idea.

Should the 40 Weight be non-detergent or detergent[?]

What is recommended for the rear axle/differential[?]

Thanks for suggestions-I need them[]

Jimmie
Orange County, Indiana
1950 CHAMPION -ORANGE COUNTY, INDIANA

[gordr]

Honestly, I'd just drain the EP-rated oil, and fill it up with 40W engine oil, and call it good. A half-ounce of EP 90W diluted by a pint or more of 40W shouldn't be cause for alarm.

I'd say non-detergent oil would be best for a transmission, since there is no filter to catch the particles that detergent oils can pick up. Better to let the debris settle out. But I suspect it really doesn't matter all that much. The synchros WILL work better with 40W instead of EP 90W, that's the bottom line.

Rear axle: 80W-90 EP-rated oil for sure. That's where EP (extreme pressure) rated oils are meant to be used: in rear axles with hypoid gears that rely upon a sliding contact between the teeth of the mating gears.

Gord Richmond, within Weasel range of the Alberta Badlands

[Bud]

You can use SAE 40 either detergent or non detergent or you can use an SAE 90 GL1 mineral gear oil. NAPA has the GL1 oil as that's where I buy the oil for any OD transmissions that I service. Use either 80W-90 or 85W-140 GL-5 gear oil in your differential depending on the climate in your area. Bud

[royvaldez]

you can use SAE 90 wieght Mineral oil from NAPa.