Frank Wilkie Posted Monday at 11:38 PM Share Posted Monday at 11:38 PM (edited) I have a 1939 GMC with a 228 engine.. It has a 4 spd. transmission in it.. The casting number on the side is GM 5904-4 and below it is ElS-W941.. Is this a Chevrolet or GMC transmission? I know the series 152 of the GMC trucks which mine is do not show any 4 spd. transmissions.. I haven't got to the rear end yet but I was told by one of the previous owners it was a Chevrolet 3rd member.. Edited yesterday at 12:11 AM by Frank Wilkie (see edit history) Link to comment Share on other sites More sharing options...
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