On the 3-ring input, the middle and rear ring (actually on the clutch retainer) feed the rear clutch, the middle and front ring are for the lockup converter. No advantage to use it on a non-lockup trans.
Okay, that makes sense. I have parts from a 1978 big block 727 (non-lockup) on hand as well as parts from a lock-up 727. The input shaft on the non-lockup is solid between the middle and front ring while on the lockup input shaft there is a hole there. The input shaft from the non-lockup '78 trans is in nice shape so I was planning on using it along with the late model pump and reaction shaft.
Is there a difference between the pump and reaction shaft in the lockup vs. the non-lockup 727 or can I use either on? I looked them over and didn't see a difference but there must be some sort of additional fluid passage in the lockup one that I missed.
