Slide hammer is the best way to go, but it will need modified attachments
We modified this slide hammer puller set in our shop so it will work in removing two key components in the 722.3 and 722.4 automatic transmissions. Getting the B2 piston and sleeve out of the case can be a real bear without this tool. With it, it comes out quickly and easily. Using a different attachment, the slide hammer makes quick work of removing the front pump from the transmission case.
722.3 722.4 B2 Seal/Sleeve and Front Pump Removal Tool Kit
$65.00
SKU:
TUL-7223SLIDEH 
Product Details
Here are the modifications we make:
This kit can be used to pull other seals and bushings on any car. These are the extra attachments included:
Here is how to get the front pump out.