I'm no expert by any means, but I think that it would be easy to change from a 16 gal to a 20 gal if you have a long wheel base. We have two long wheel base truck, both with dual tanks and they are 20 gal. I don't believe that it would work on a short wheel base. I wish it would though!
Al
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97 K1500 Tahoe 5.7 Stock "Driver"
78 swb C10 Silverodo/ 350cu. dual Flowmaster's, MSD cap, and wires. "Project"
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