Please clairify something for me

[steves66]

How many splines on the pump output shaft does a 1966 727 transmission supposed to have? I posted last week about my J&W converter not going on. Well the problem is I have a 19 spline output shaft and they sent me a 23 spline converter!!! Can someone clear this up for me, what years has how many splines?

[Headrope]

I've got a '66 with a '66 727 in it. I ended up taking it to a transmission shop and having a new output shaft installed so that I could use aftermarket torque converters.
I've been told the '66 is somewhat unique in that it has a 19 spline shaft.

[John_Kunkel]

'66 is the last year of the 19-spline input shaft, '67 and later non-lockup converters have 24 splines (lockups have 23 splines).

Very few performance converters are available for the 19-spline shaft, the best thing to do is convert the trans to 24-spline.

[firefighter3931]

Yep, sounds like you've got the wrong converter Steve  Call Turbo Action and talk to Paul....he might have something for you in a 19 spline.

Ron