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Tool: "GM TRANSMISSION SEAL TOOL"
Available at NAPA Auto Parts or it can be ordered online at there website.
PART NUMBER: 7769250

So, your transmission is leaking even AFTER you have replaced the transmission pan gasket and you have no idea where it could be coming from OR, you have never done a shift shaft seal replacement and you need to know how to do it RIGHT/CORRECTLY? Well, here is the correct way to do it with the correct tools. The job always gets done right with the right tools, general know how (DIY common sense), and the proper step by step instructions, if needed.

This method will work on several different makes, models of transmissions. I just happen to have a Chevy 4x4 K5 Blazer, 350 5.7 w/TH350 auto transmission.