50wt Trans oil

lilm38 · Post by **lilm38** » Mon Sep 12, 2022 6:10 pm

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

Mike_B · Post by **Mike_B** » Mon Sep 12, 2022 7:23 pm

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

Post by **wesk** » Mon Sep 12, 2022 7:30 pm

Good advice. The same goes for modern engine oils. Your engine, tranny, transfer were not built for use with these 21st century fluids.

lilm38 · Post by **lilm38** » Mon Sep 12, 2022 7:44 pm

Thanks Mike and Wes. Thats what I needed to know. Will go with your recommendations.
Steve

Doubleclutch · Post by **Doubleclutch** » Mon Sep 12, 2022 8:53 pm

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.