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Discussion Starter · #1 ·
I own two automatic 76 W100s and the first has a 318 with a A727 transmission which is visibly marked on the side of the transmission.

My other one does not have such markings. Its mated to a 400ci BB
Not sure if it is a 3speed or a 4 speed

Not sure where to look - the numbers I have found are

3898856  M5274  14something?
374328A-8  where the A-8 could be something else - hard to tell?

 

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the 518 4 speed will have a second electric connector , it is driver side , behind and above the one you see in the photo ( that is reverse lights and neutral safety) . if I had to guess I'd say 3 speed 727 is what you have there .
 

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There are no big block overdrive transmissions and there are no smaller transmissions used with the big blocks than the 727, so pretty much if you have a big block then you almost certainly have a 727.  The A518, aka 46RH, was not an option until 1990.  There are adaptors to mate a A518/46RH overdrive transmission to a big block, but it would be pretty obvious if an adaptor was used.
 

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although your trans does not look original to the truck , I see no adapter ...
 
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