Some time ago I rebuilt the tandem pump on a 350 sdl, up to a point.
I was unable to get the drive shaft out so I sent the unit to a shop to remove
the drive shaft (the part that goes throught the vanes). While they were doing
this work to install the front seal, they discovered that the front bearing was also worn out of tolerance. That part of the rebuilding cost me about $ 150.
The front of the shaft is threaded for using an extractor or puller.

For future use can anyone describe the procedure in removing that drive shaft?

Regards,
Constantine