Re: 1935 model 120

Posted by 39Pickle On 2008/11/15 8:09:59

The 1938/1939 Shop Manual calls for S.A.E. 140 or 160 mineral oil (summer) and S.A.E. 90 (winter) in the standard transmission. For the rear diff, use S.A.E. 90 regardless. With our modern lubricants, I would think you could use a quality 90 weight all around. What ever you do, never use kerosene to flush the differential.