In my "stash" I have 3 converters for 727/A518 , and I believe they are all non-lockup. Is there a way to tell by looking down their throats?

 

Spline count is different. I don't remember #'s

 

Good question Bill

 

PM me tomorrow and I'll pull a lockup one off the shelf and count the splines for you if you want.

 

Non lock-up have 24, lock-up have 23. The lock-up input shaft has a turned down smaller diameter shoulder on the end. I,m not sure how to recognize this step inside the converter, never looked in there, always tagged them when removed from a stepped input shaft.