Torque converter issues

[BamaCharger66]

Okay, I’ve put a few torque converters on in my life. But, I had to walk away from the garage tonight.
I did just read a few comments on other guys having problems. And I ran across a gentleman saying 1966 splines are different that 1967 (big block). If this is the case, that is my problem. I snatched a ‘67 727 out and tried to mate my old ‘66 converter to it. Not happening! Even after 20 or so tries!

 

[Don Frelier]

Yes that's not going to work spline count is different.

 

[Dave6T4]

Size of the input shaft is different, too. '67 and up is larger than '66 and down. You can actually put a '67-newer torque converter on a '66-older transmission by mistake. It won't go anywhere, however, because the driven element in the converter will just spin around the smaller input shaft.

 

[zyzzyx]

How's about changing the input shaft???

 

[dvw]

You can swap the input shaft and reaction shaft support from the 66. 15 minute job.
Doug

 

[eldubb440]

learned my daily factoid early today.......

 

[RemCharger]

The 67 converter will make it move for about a minute... until it grinds out the splines...
Is what I've witnessed