01-22-2018, 01:37 PM | #1 |
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Join Date: Mar 2015
Location: Michigan
Posts: 47
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Square body tank swap
I've searched lots of old threads about swapping a square body tank into the 67-72 suburbans and I found info on the pickup trucks and some limited info on our trucks.
Does anyone have any experience or info on the swap. I think I want to use a 31 gallon tank because it looks like it wont hang down as far. My tank smells of old gas and the only replacement I've found is a 21 gallon tank, I don't think anyone makes a larger one that i have seen. It looks like the filler neck is in the wrong place on the square body and I will need to remove a cross member. |
01-23-2018, 08:24 PM | #2 |
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Join Date: Mar 2004
Location: Fargo, ND land of the flat hills
Posts: 1,147
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Re: Square body tank swap
I have a 31 gallon square body tank in my 68. I cut off the tank filler and moved it to the other side of the tank (easy welding, as it was a new tank). I previously had a 55 gallon boat tank in it, so there weren’t any stock crossmembers remaining so I added a few square tube crossmembers to hang the 31 gallon tank straps off of.
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Andrew 84 GMC C1500 SWB 6.2 Diesel/700R4/3.42 "Grandpa's odd duck" |
01-31-2018, 09:53 AM | #3 |
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Join Date: May 2013
Location: Long Beach, MS
Posts: 18
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Re: Square body tank swap
On my 68 I purchased a tank and modified it to fit between the rails and under the supports. Cost a little but worth it.
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01-31-2018, 02:12 PM | #4 |
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Join Date: Apr 2011
Location: Klein Texas
Posts: 3,852
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Re: Square body tank swap
AFAIK, the difference between the 31 gallon and the 40 gallon is the depth. I have a 40 gallon my Suburban and the width and length are perfect. And since I have 4WD the depth is no problem. It looks like it came that way from the factory.
To do so, you need to remove the rear crossmember and move it toward the rear. I purchased another (same) crossmember off the parts board and installed it ahead of the tank. This holds the tank at the top and allows for use of factory R-body tank straps. Not mine but you get the idea: Like lowrollin said, this puts the filler neck in the wrong position. If you can find flexible enough filler hose you might be able to heat the filler tube on the tank and swivel it around to make it work. I relocated mine to the corner also. And since I went fuel injection I bought a fuel injection tank. I don't know if a carb or diesel tank are different, but the filler neck is about a 1/4" larger diameter. I had to glue a filler piece in the filler hose to mate to my filler tube. Another view of mine:
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My Classics: '72 K20 Suburban + '65 Dodge Town Wagon '72 Corvette Roadster +'67 Corvette Roadster '73 Z-28 Camaro '63 Ford SWB Uni Pickup '50 Ford Coupe Last edited by Bigdav160; 01-31-2018 at 02:24 PM. Reason: edit to add pic of my truck |
01-31-2018, 07:00 PM | #5 |
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Join Date: Apr 2011
Location: Klein Texas
Posts: 3,852
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Re: Square body tank swap
Looks like Richard has the crossmembers for sale in the Sub parts area.
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My Classics: '72 K20 Suburban + '65 Dodge Town Wagon '72 Corvette Roadster +'67 Corvette Roadster '73 Z-28 Camaro '63 Ford SWB Uni Pickup '50 Ford Coupe |
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