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18 spline 4 speed identification

John Milner

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I have this 18 spline 4 speed and I was wondering if anyone could help me out with the VIN stamping on the side to see what this came out of originally and if this was originally an 18 spline transmission. Thanks

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The '823' extension housing is correct for a 68. The 68's stamped the last vin numbers on pad. Your 8G.. will be hard to track down as to a 440 MT car, but assume it did.
 
Certainly looks like a original 68 b body combo
 
Check the front bearing retainers bolt circle diameter. It should be 4.16". In 1968 and 1969, only 18 spline transmissions had that bolt circle, from the factory. That bolt circle was used with the 308 bearing, and only 18 spline transmissions used it in those years
 
Thanks everyone. I did not know that about the front bearing. This one does have the larger front bearing. Looks as if it all grew up together. I was a little curious if it came behind a Charger or GTX, and if it was a Hemi or 440 car but it doesn’t look as if there is a way to tell.
 
Starting in the 1970 model year the 308 bearing was used on some 23 spline transmissions as well. The 66-67 18 spline transmissions used the 307 bearing.
 
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