1934 Ford rear end gear oil
 

Will 90 weight gear oil work in the rear end on 1934 Ford rear end?

Re: 1934 Ford rear end gear oil
 

Of course it will work..question do you want to do that ? I use off the self auto parts 85-140 seems to work fine..I have run 30 wt motor oil in manual trans before and it works fine ,a little noisy maybe..model A era they used heavy oil..150 wt +-..sc

Re: 1934 Ford rear end gear oil
 

Here's what I use in the rear of my '35 and '36 only because it's compatible with the yellow metal in the trans and I don't have to stock two fluids... https://smile.amazon.com/Sta-Lube-SL...qid=1569099984

Ooops sorry about that first pic. Second one is good stuff, first one is pure trouble.

Re: 1934 Ford rear end gear oil
 

A period lubrication chart (1932-1935) list: Extreme Pressure (EP), Winter SAE 90 or 110, Summer SAE 160 for the rear axle. If you are wanting to use the same lube in the transmission then Mild EP would work for both (GL-4 in todays ratings). And if you are not wanting to change gear lube with the seasons run a multi-viscosity lubricant.