I just did that job with the tank in place and the nut plate is under the tank. It’s loose so if you remove both bolts you’ll have a hard time getting it back into position then reinserting the bolts. I was able to remove the mount by removing one bolt and inserting a stud then removing the second bolt. The stud enabled me to control the plate to reinsert the first bolt. I snugged the bolt, removed the stud, reinserted the second bolt, then tightened up both bolts.

Although this worked pretty well, I highly recommend removing the tank as it will be much easier.

The next tip I can give you is cut some blocks of wood the thickness of the clearance needed (I cut mine 13/16” thick and that will get you in the ballpark) and place them between the frame and floor then remount the rear cab mounts. That will get you really close.

Last edited by Phak1; 01/02/2024 3:08 PM.

Phil
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1952 Chevrolet 3100, Three on the Tree, 4:11 torque tube
Updated to: ‘59 235 w/hydraulic lifters, 12v w/alternator, HEI, PCV and Power front Disc Brakes
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