904 identification

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wes beem

wes beem

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Picked up this 904 today, wondering if anyone knows how to decode the numbers and tell me more about it.

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lemondana said:
1968 or earlier by the single post neutral safety switch.
Click to expand...
Good catch!
I'll add:
1.) It appears from your pics that you have mechanical shift linkage. That points to '66 and up. ('65 and earlier were cable-shifted, had a different type of speedo drive, and a ball and trunnion output shaft).
2.) Count the splines on your input shaft. If it's 18 spline, that'll make it a '66-'67. If it's 27 spline, it's a '68 and up. (26 spline would make it a later lockup/OD transmission, but the single post NSS rules that out.)
3.) 18 spline transmissions also had a convertor hub diameter difference from '68 and up transmissions, which means the recess in the rear crank flange also changed diameters. To use an early transmission on a late ('68 and up) motor, you need to have a bushing made to fit the large crank pocket and reduce it to the early size. To run a late trans/convertor on an early motor, you need to have a machine shop enlarge the crank pocket.
 
Professor Fate said:
Good catch!
I'll add:
1.) It appears from your pics that you have mechanical shift linkage. That points to '66 and up. ('65 and earlier were cable-shifted, had a different type of speedo drive, and a ball and trunnion output shaft).
2.) Count the splines on your input shaft. If it's 18 spline, that'll make it a '66-'67. If it's 27 spline, it's a '68 and up. (26 spline would make it a later lockup/OD transmission, but the single post NSS rules that out.)
3.) 18 spline transmissions also had a convertor hub diameter difference from '68 and up transmissions, which means the recess in the rear crank flange also changed diameters. To use an early transmission on a late ('68 and up) motor, you need to have a bushing made to fit the large crank pocket and reduce it to the early size. To run a late trans/convertor on an early motor, you need to have a machine shop enlarge the crank pocket.
Click to expand...
what would it take to run that trans on a 360 magnum
 
Its deff non lockup, i had the converter out and the splines go clear to the end of the shaft.
 
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