Help converting my 64 to 66 23 Spline 8A33 to an overdrive ?

64whiteghost said

Hello guys.

Thank you for all the help so far

I have a 64 to 66 A833 that i would like to convert to an overdrive style. Ive read that Passons makes a kit. And brewers also make ones. Which would would be the best that would not require me to modify the tailshaft ?

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First order of business is figuring out what you have. '64-'66? No such creature. '64-'65 used a flanged ball and trunion output shaft and housing, '66-'67 used a 27 spline slip yoke output shaft and housing. '68 and up (including OD trannies) had 30 spline output shafts and housings.
Not saying some mix and matching can't be done, but for the amount of parts that would need to be changed over I think you would be much better served to just source a complete A833 OD transmission and bellhousing.