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A couple of things, maybe they are mentioned and I didn't catch it....
Some full size GM vehicles used the same washer pump. Corvair cars used the exact same wiper motor as our trucks.
https://www.classicchevy.com/full-si...ails_tab-title naturally they are out of stock....
Also, your washer fluid tank is mounted on your core support, not the firewall.
I will have to check some of my wiper motors but I am pretty sure they all have a metal gear on them. Nice write-up on the repair.
Thanks,
LockDoc