Just head to your FLAPS or local farm store and pick up 75w90
and that will take care of all your transmissing and axle needs.
That's all that is used in many over the road fleet trucks. I'd
stay away from the more expensive synthetics especially if it's an SM420 transmission.
Denny G
Last edited by Denny Graham; 04/27/2013 11:05 AM.
