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Earlier SM465
The earlier era of the SM465 include the 1968 - 1978 transmissions. There were both 2wd and 4wd versions. Internally, they are identical to each with the exception of the transmission mainshaft. The 4wd version of this mainshaft (or "output shaft") has a 10-spline output with a 2-5/8" stickout and an accompanying 4wd adapter housing. The 2wd version has a 35-spline threaded mainshaft compatible with a driveshaft yoke, and accompanying 2wd style tailhousing.
**************"The 4wd version of this mainshaft (or "output shaft")".****************
http://www.novak-adapt.com/knowledge/sm465.htm
Good catch there son !!! I had never heard the output shaft reffered to as the mainshaft until you said it. Good info on that link. Anyone doing a SM465 conversion needs to familiarize themselved with that info.