Guest Posted October 22, 2006 Share Posted October 22, 2006 Does anyone know exactly werre the numbers are stamped on the tail shaft? There are two significant variations of the TH400. The TH375 was a version of the transmission used from 1972-1976 in smaller displacement cars. It is identified easiest by its "375-THM" designation cast in the underside of the tail housing. The TH475 was an extra-heavy-duty version, and was found in larger trucks from 1971 on. Quote Link to comment Share on other sites More sharing options...
Guest Posted October 22, 2006 Share Posted October 22, 2006 I thought on 400's that there was only a tag and some numbers stamped on the lip by the pan. http://www.corvetteforum.net/c3/1970registry/th400tag.html Quote Link to comment Share on other sites More sharing options...
Mike 57 Posted October 22, 2006 Share Posted October 22, 2006 the 375 has 375THM cast on the bottom of the tailshaft in 1/4 inch high letters about six inches long right behind the mount. The output shaft is the the same size as the turbo 350. The 475 was used from 71 up in medium duty trucks, motorhomes and buses. There is no way to tell from the outside execpt from ID, but I think that most of them have bolt on yokes instead of a slip yoke. They have straight cut planetary gears. Too many codes to list, they are on a tag on the right side of the case the large letters 1 on the left and 1 on the right side of the tag. Quote Link to comment Share on other sites More sharing options...
Guest Posted October 22, 2006 Share Posted October 22, 2006 I am pretty sure it is out of a 78 Chevy truck with a bolt on yoke. There is a serial ID but still not sure if it is the heavy duty or not. Can I get a standard slip yoke and use it instead of the bolt on yoke? I pretty sure the bolt in yoke is for vehicles with carrier bearings and hoping it will not make a difference if I use a slip on yoke. Quote Link to comment Share on other sites More sharing options...
Mike 57 Posted October 22, 2006 Share Posted October 22, 2006 Is the yoke bolted in with a bolt going into the center of the output shaft or is there a nut on the output shaft? I would have to crawl under my pickup to look and it is raining and cold! If the yoke has a bolt going into the output shaft I bet it would work. I am thinking that if the output shaft has a threaded portion on it the yoke may bottom out on it. In 78 the code for a turbo 475 is CL Quote Link to comment Share on other sites More sharing options...
Guest Posted October 22, 2006 Share Posted October 22, 2006 Mine has the code of CM do you know what CM is?and it is a bolt going thru the yoke threaded into the output shaft. Quote Link to comment Share on other sites More sharing options...
Mike 57 Posted October 23, 2006 Share Posted October 23, 2006 According to the book i am looking at it is from a series 20 or 30 chassis. I think the tranny would work with a standard slip yoke. Quote Link to comment Share on other sites More sharing options...
Guest Posted October 23, 2006 Share Posted October 23, 2006 I was told it was from a 3/4 ton 78 Chevy truck if that helps. Quote Link to comment Share on other sites More sharing options...
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