I’m not positive, but I believe this version of the Borg Warner Overdrive can be used by a variety of 50’s and 60’s vehicles including jeeps with the dana 18 transfercase. Here’s an article that explores the overdrive issue on older jeeps.
“R10H-1 overdrive, Warner Gear Div., believe out of 50’s chevy? Good condition! $85 or trade for willys, cj parts.”
