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Midship Tank 4 x 4 w/E4OD trans and 3378 mm (133 in) wheelbase 22.0 gal (US)
All others 19.0 gal (US)
I just want to make sure you guys saw that above post.
REGULAR cab trucks came with a 22 gallon poly tank, the only configuration with the larger 22 gallon tank. 2wd, 4wd, 250, 350, didn't matter. If it's a regular cab it had the 22 gallon. And possibly the ext cab short bed, I don't know for sure on that one.
ALL OTHERS were 19 gallon front, and all rears in all trucks were 18 - 19 gallon.
The cross member for the driveshaft carrier bearing cuts the tank short on the longer trucks. I thought about going to a one piece shaft and add the larger front tank, but as of yet the extra 3 gallons hasn't motivated me to do so.