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Bruce Lancaster · 04-22-2013, 06:37 PM

600 shouldn't come near a spiral geared trans...for this just look in your owner's manual or a Ford service manual. They specified 90 or 140 based on temperature, and the 140 should likely get the nod if trans is a bit loose with age.
The same numbers Ford called for are still at the car parts stores, and the modern ones are presumably vastly better than those available 70 years ago. Spiral gears and then the even more stressed offset gears brought in all sorts of additives and lube tech and you sure do not want anything that Ford dumped as soon as the formulations for modern gears came out in '32!

04-22-2013, 06:37 PM	#9
Bruce Lancaster Member Emeritus Join Date: May 2010 Location: Madison, NJ Posts: 5,230	Re: lube for trans and rearend 600 shouldn't come near a spiral geared trans...for this just look in your owner's manual or a Ford service manual. They specified 90 or 140 based on temperature, and the 140 should likely get the nod if trans is a bit loose with age. The same numbers Ford called for are still at the car parts stores, and the modern ones are presumably vastly better than those available 70 years ago. Spiral gears and then the even more stressed offset gears brought in all sorts of additives and lube tech and you sure do not want anything that Ford dumped as soon as the formulations for modern gears came out in '32!