Need some help with a d20 problem

[JB Fab]

Went out looking for some of that Lucas 50wt today and came up empty handed. Would some of the rear end 80-90 ive got sitting on the shelf already be just as good in my dana 20?

I said Lucas, but would have taken any 50. I am planning on swapping to a 700r4 and an atlas next year. Anyone know what fluid that takes? Figured I’d ask since I was already here asking question. Thanks

Truck stops have 50wt since it is very common in OTR truck manual transmissions. Needs to be rated MT-1