A727 Rebuild kits redux - Rebuild kits everywhere (62-70 vs 71+)

pomonamissel said
i'm going to get into a couple of early cable shifter 62-65 727's , i'm changing up the front pumps and conv's to the 66 up type . but in my read through your thread i think i read that the 71 up pump can be used with the same front drum set up . is that true , everything in the front swaps out or what ?

Hey Pomonamissle I hink you're referring to Tracy's post number 7. See snippet below)

"Basic differences, the 66-70 had a 1/2 wide reaction shaft bushing(the one that's pressed into the front clutch hub) and different reaction shaft accordingly. 71-up had a 1" wide bushing, much more stable and lasts longer. Due to more stability the reaction shaft sealing rings also last longer. 71 and up also had a revised seal in the front clutch that lasts longer and seals better. 71-up had part throttle kickdown. If it's a street car it's a nice feature because torqueflite's with a shift kit are notorious for the kickdown not working good enough. If your like me and like to manual shift most of the time it's no big deal. The part throttle kickdown is a part of the valve body. I've heard you can bolt a part throttle kickdown module to a non part throttle VB but tried on one and it wouldn't fit. There are some variance in valve bodies so maybe you can on some but not others?? Again this is just a creature comfort item, not at all necessary.

BTW: To upgrade your trans. to a 71-up style all you have to do is swap in the front clutch drum and reaction shaft from a 71-73 model. Make sure you get a drum that holds 4 clutch discs, some only held 3. If you decide to upgrade to the newer stuff any later than 73 and parts interchange is hit or miss as they revised the rear clutch drum a few times and it may interfere with the reaction shaft. You could always swap out the rear drumassy. as well if you have the money. I do this on all serious high perf. applications but lower hp daily drivers I don't worry about. "