Re: 1937 120C Transmission Lock Up

Posted by Ross On 2021/4/9 18:48:30

Use a GL-1 rated 90 weight gear oil. That is available from NAPA and farm stores. Fill it to the level of the filler plug on the side of the case. You can pour it in the top of course, but transmissions are more normally filled from beneath the car, hence the large plug on the side of the case.

I am thinking you'd better check your rear axle level. That will require a GL-4 rated 90 weight.