MH20-gs transaxle fluid type?

[curtis.m]

Hi, I recently picked up a 1948 ( I believe) MH20-gs with a 2.0L continental gas motor. I have been running a 10-30 oil in it, and am just about to change the transaxle oil. I figure it will take an 80-90 weight gear oil? I am not sure, some people suggest a 20 weight hydraulic trans fluid? Some people suggest straight 30 weight engine oil....

Can anyone confirm? I haven't drained it yet so I guess when I do it will be obvious.

Also - is there an aftermarket rad for the 20 series? if not ill get one that fits and fab up some mounts. Thanks for your time.

 

[Gary Mitchell]

I personally would err on the side of heavier oil. It'll give more "cush," probably be a little quieter, and less likely to leak. IMO, gm

 

[Mike in Mn.]

I have a book on a Massey 20, book says 90wt. gear oil in Winter and 140wt. gear oil in Summer. There are two separate gear boxes, one for the transmission and one for the rear end, each has there own fill and level plugs, trans takes about two gallons and the rear end takes about four gallons.If yours has a belt pulley that also has it's own gear box and the steering box also has a reservoir, they all take gear oil. Don't know about the radiator, mine has some kind of a small Ford car one fitted into it, says fo-mo-co on top of the tank.