Julio_Az Posted November 7, 2014 Posted November 7, 2014 Okay I have a 1986 Comanche long bed and I'm getting converted to short bed and I need a smaller gas tank.... I know 1990 Comanche short bed came with a 18 gallon tank and I just found out that the 1986 Comanche short bed came with a 16 gallon... So my question is will I still be able to use the 18 or ima need the 16 gallon?
Pete M Posted November 7, 2014 Posted November 7, 2014 what you can use depends entirely on how this conversion is being done. longbed and shortbed uni-frames are pretty different under the beds.
Julio_Az Posted November 7, 2014 Author Posted November 7, 2014 Really? Yea as far as I know my bed is being cut from front and back end of the bed and the unibody cut from the back and the differential moved forward bout 6 inches I believe
Pete M Posted November 7, 2014 Posted November 7, 2014 pardon my bluntness, but that's an insane amount of work to be done only to accomplish what can be easily purchased in the used car market. why exactly are you doing it this way? because it's all very custom work, it's impossible to say which tank you can use.
dankicksass Posted November 7, 2014 Posted November 7, 2014 Just cut it behind the shackle hanger and shorten the back of the bed up. Why would you work harder than you have to? You can get it down to a 6 ft bed like that. It's pretty much just body work. You keep re 120 in wheel base and lose the nasty rear overhang.
gogmorgo Posted November 7, 2014 Posted November 7, 2014 Arguably the best way to go from long bed to short bed is to buy another MJ that already has a short bed, instead of compromising your vehicle by effectively chopping it in half. Also, there was no short bed in '86, so I don't know what fuel tank you're talking about. Depending on where things are being cut, you might not be able to use either tank in a "factory" way. The tank is formed around the bed's structure, and IIRC actually hangs from the bed itself, right around where you'd need to cut the frame ahead of the rear axle. The fuel door is not in the same location relative to anything on the short bed and long bed, as well, so you may encounter issues trying to use the stock filler neck. If you're 100% committed to shortening your bed, you may just have to wait and see how things line up after being stuck back together before you can know exactly what you're up against, especially as it sounds as though you aren't doing it yourself. For what it's worth, I have the biggest option tank on my LWB, and it basically goes all the way from the back of the cab to the wheel well. There's no way it would fit in the same way in a SWB truck.
Julio_Az Posted November 7, 2014 Author Posted November 7, 2014 Yea getting a short bed would be the best thing to do but down here in the southwest they are just stupidly over priced. And I paid 5hundred in California for mine it was 4 cyl and I had a wrecked xj cherokee so I transfered everything from my 01 xj to the 86 mj. I've just put so much time into this truck and it's my 1st build from the ground up and I'dlove to push it thru. the bed convertion is kinda a common thing here since short bed mjs are over priced
Julio_Az Posted November 7, 2014 Author Posted November 7, 2014 Was doing some research and it said short bed 16 gallon fuel tank.. maybe it's just bs or they got the info wrong. And no not doing it my self I'm in Utah due to work and all the fab work I'm getting it done by a fab shop across the border in Mexico since I'm Yuma Az 30 minute drive to Mexico..
onlyinajeep726 Posted November 7, 2014 Posted November 7, 2014 In '86, the tank size is 16 gallons. AFAIK, that's the only tank size the MJ got in '86. Also, the '86 was only LWB. No short bed that first year.
mvusse Posted November 7, 2014 Posted November 7, 2014 Okay I have a 1986 Comanche long bed and I'm getting converted to short bed and I need a smaller gas tank.... I know 1990 Comanche short bed came with a 18 gallon tank and I just found out that the 1986 Comanche short bed came with a 16 gallon... So my question is will I still be able to use the 18 or ima need the 16 gallon? There never was a 1986 short bed. The short bed version didn't come out until 1987.
Eagle Posted November 7, 2014 Posted November 7, 2014 Okay I have a 1986 Comanche long bed and I'm getting converted to short bed and I need a smaller gas tank.... I know 1990 Comanche short bed came with a 18 gallon tank and I just found out that the 1986 Comanche short bed came with a 16 gallon... So my question is will I still be able to use the 18 or ima need the 16 gallon? This is very interesting, considering that there was no shortbed Comanche in the 1986 model year. The shortbed first appeared in 1987. Fuzzy recollection is that the 1986 16-gallon tank is the same size as the larger longbed tank, with an internal restrictor to limit capacity.
Julio_Az Posted November 7, 2014 Author Posted November 7, 2014 Hmm that weird.. I think ima just go with a 18 gallon tank
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