Youre limited to the Ford truck 4 speed from that era, unless you get an aftermarket adapter from Speedway Motors, Honest Charlie's or another supplier. Ford V8s up to 1949 had the cast to the block bellhousing. Beginning in 1949 until 1953 Ford flatheads had a two-piece bellhousing (and a few more available transmission adapters).

I've bought quite a few parts from these guys- lotsa info on their site!
vanpelt
 
(quoted from post at 07:20:51 02/26/20) Does anyone know what bell housing and 4 speed trans would bolt on to a '47 Merc 239 flathead
You didn't say if you meant a Mercury truck or car. Some of the best information I've ever found for my flathead Ford/Mercury problems is a discussion forum at "the Ford Barn" Somebody there will know.
 
You must be my brother from a different mother!! that info just lays in your head and falls out when needed
 
You really want a T-5 transmission- its a 5 speed, basically a 4 speed with overdrive- Older vehicles were always limited in top speed, and using an overdrive transmission should let you keep your present rear end (probably a 4.11 or thereabouts) with a 15 to 20% boost in top speed. You'll want a T-5 out of an S-10 pickup, so the shifter is far enough forward to clear the seat. T-5's out of Mustangs and Camaros have the shifter so far back it will end up in the middle of the seat of your pickup. My Speedway catalog is about 10 years old, but has a Chev T-5 to Ford or Merc flathead adapter- part No. 916-28928. Website is speedwaymotors dot com.
 

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