I should be embarrassed to ask this...
I got an 1979 f-250 plow truck 4x4 - sitting all summer - (it's a yard truck only)
& it ran great last year, now it goes it reverse fine, forward is ruff, (wines & moves slowly)

front transfer case needs oil (I assume the back & middle will too)
but I'm not sure what kind of oil to add.

the owners manual looks like I should add transmission fluid, but it looks black & smells burnt.

What should I add?

thanks! Mike

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