TCI 727 Torqueflite Rebuild Kits 1962-1970 vs 1971-1979

[LSS&B]

TCI sells 19-spline 727 rebuild kits 1962-1970
https://www.tciauto.com/racing-62-70-torqueflite-727-19-spline-non-lock-up-overhaul-kit.html
TCI also sells 24-spline 727 rebuild kits 1971-1979
Ultimate Master Racing 1971-1979 Torqueflite 727 (24-Spline, Non Lock-Up) Overhaul Kit
My Question: I thought 19-spline input shafts ended in 1966.
What is the reason for continuing the 19-spline kit thought 1970?
Was there an internal change in 1971 that necessitated a different rebuild kit?

 

[pnora]

TCI sells 19-spline 727 rebuild kits 1962-1970
https://www.tciauto.com/racing-62-70-torqueflite-727-19-spline-non-lock-up-overhaul-kit.html
TCI also sells 24-spline 727 rebuild kits 1971-1979
Ultimate Master Racing 1971-1979 Torqueflite 727 (24-Spline, Non Lock-Up) Overhaul Kit
My Question: I thought 19-spline input shafts ended in 1966.
What is the reason for continuing the 19-spline kit thought 1970?
Was there an internal change in 1971 that necessitated a different rebuild kit?

You are comparing a seal kit to a overhaul kit with clutches. At one time the kits covered all the 727 transmissions. Of course there would be extra seals, spacers, clutches, etc. Then they decided to market them with up to and after. Just to save a few bucks. Why TCI is listing them by spline count who knows. Yes there were some changes between 70 and 71. Some drums and piston changes as well as reaction shafts. So there are bushing and seal differences. A couple of bucks difference between the kits. Stupid in my opinion.

 

[GTX JOHN]

You are correct the 19 splines to 24 in 1967 in every
727 that I have seen.

 

[LSS&B]

You are comparing a seal kit to a overhaul kit with clutches. At one time the kits covered all the 727 transmissions. Of course there would be extra seals, spacers, clutches, etc. Then they decided to market them with up to and after. Just to save a few bucks. Why TCI is listing them by spline count who knows. Yes there were some changes between 70 and 71. Some drums and piston changes as well as reaction shafts. So there are bushing and seal differences. A couple of bucks difference between the kits. Stupid in my opinion.

You are correct the 19 splines to 24 in 1967 in every
727 that I have seen.

I have a 1967 BB 727, that may have some rusted internal components.
Will internals from a 1979 727 install in the 1967 727 housing?
Not talking about rebuild parts, but more like drums, planetary gears, sun gears, valve body or other parts that I might generally reuse.

 

[pnora]

I have a 1967 BB 727, that may have some rusted internal components.
Will internals from a 1979 727 install in the 1967 727 housing?
Not talking about rebuild parts, but more like drums, planetary gears, sun gears, valve body or other parts that I might generally reuse.

Far as I know they will fit. Make sure that 79 is not a lock up style.