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50wt Trans oil
Posted: Mon Sep 12, 2022 6:10 pm
by lilm38
I know this has been discussed to death but I found this product that seems viable for the M38 transmission and transfer case. Or is it? Thought I'd ask before I ordered it. Thanks.
https://www.amazon.com/Lucas-Oil-10146- ... B07CQ876NG
Posted: Mon Sep 12, 2022 7:23 pm
by Mike_B
Be careful using synthetic oil in your transmission, they tend to be to slippery not allowing the gears to stop spinning between shifts causing them to grind.
I use 90wt Mineral Oil in all of my old trucks...sold at Tractor Supply as Ford Tractor Transmission Fluid.
https://www.tractorsupply.com/tsc/produ ... B0QAvD_BwE
Mike B
Posted: Mon Sep 12, 2022 7:30 pm
by wesk
Good advice. The same goes for modern engine oils. Your engine, tranny, transfer were not built for use with these 21st century fluids.
Posted: Mon Sep 12, 2022 7:44 pm
by lilm38
Thanks Mike and Wes. Thats what I needed to know. Will go with your recommendations.
Steve
Posted: Mon Sep 12, 2022 8:53 pm
by Doubleclutch
Just another option is Driven Racing Oils.
https://drivenracingoil.com/ They have a GL4 80W-90 oil safe for yellow metals, good in the classic transmissions. There hot rod and classic engine oils have the added “zinc” content for older or high performance engines with flat tappet camshafts. I use these oils all the time in older vehicles with good results.