You can install it afterwards, however, if I remember right, there is a supporting bolt on the back(front using direction of truck) that can be a b*tch to get to, and that was before closing off the firewall. I wanted to use bulkhead connectors in the firewall, but, the connectors on the a/c unit were too close to the firewall to allow this to be arranged.
Good luck with your project
Cheers
Richard
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Broken Arrow, OK.
1977 Corvette, ZZ4 Crate, new interior, new suspension, new driveline, you get the picture, (new project / daily driver)
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