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Old 03-06-2011, 09:04 PM
Keanu151515's Avatar
Keanu151515 Keanu151515 is offline
Join Date: Dec 31, 2010
Location: Virginia Beach
Posts: 134
78 J10 long bed swap to stepside

Call me crazy but im looking to swap my long bed out to a early short bed stepside. Always loved the stepside look better. well, the bed itself is from a newer j series and the fenders are from an early gladiator

Doing some measurements the only thing that i can tell from my infinite knowledge is that the mounts are all the same except for the distance between the center two mounts which is 1ft shorter on the stepside than the long bed.

My plan is to cut the new bed in half and weld in a 1ft section to extend the bed to the correct distance for the mounts.

Has anyone ever done this or know of someone who did it?
1978 Jeep J10 360 4bbl, T18A 4spd, D44 axles
1971 AMC Javelin SST 401 4bbl, 727, Drag car
1967 Pontiac Bonneville Convertible 400 4bbl, T400, newest project

My other vehicle is a U.S. Navy Hovercraft (LCAC)

Paved Roads: Another Fine Example of Unnecessary Government Spending
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Old 03-06-2011, 10:06 PM
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247pia 247pia is offline
Grease Monkey
Join Date: Nov 14, 2010
Location: Southern Indiana
Posts: 423
I would shorten the frame and put the mounts where you need them. It will look better and be much easier.
79 Cherokee 360, T-18, Dana 20, Locked tons. I give up.
08 Liberty, 97 Z71
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Old 03-06-2011, 11:13 PM
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Carnuck Carnuck is offline
Join Date: Feb 12, 2011
Location: Gold Bar, WA
Posts: 6,467
M715 bed is long bed. Just saying.
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Old 03-07-2011, 07:36 AM
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tgreese tgreese is offline
Join Date: May 29, 2003
Location: Medford MA USA
Posts: 11,460
If a '78 is like my '77 (I'm sure it is), the same frame rails are used for the short and long beds. If you look under the truck, you'll see the holes that mount the springs further forward. The extra length is cut off the ends of the frame rails. All the extra length comes off the rear of the frame rails. Take a close look at the frame and you'll see how they did it.

So, if you change to the '78 short bed length, the frame mods will be fairly easy.
Tim Reese
Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS, hubcaps.
Browless and proud: '82 J20 360/T18/NP208/3.73, Destination ATs, 7600 GVWR
Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
GTI without the badges: '95 VW Golf Sport 2000cc 2D
ECO Green: '15 FCA Jeep Cherokee KL Trailhawk
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Old 03-07-2011, 05:48 PM
WHSII's Avatar
WHSII WHSII is offline
Join Date: Feb 06, 2010
Location: Frankfort, KY
Posts: 1,804
1890 short bed and long bed frame specs

Above are 1980 Jeep J10 long and short bed frame specs.
If the picture is not readable, go to the link below and you
can enlarge the pictures and print.

Someone correct me if I am wrong, but I believe these specs hold true from early 70's to 86.

Hope this helps.

Dad's J10, Honcho, 1980 Sport Side

Herbina 1987 Grand Wagoneer

Founding Member, FSJ Prissy Restoration Association
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Old 06-15-2018, 10:47 AM
robvolz robvolz is offline
232 I6
Join Date: Jun 12, 2016
Location: portland, OR
Posts: 26
I could sure use a clear pic of the frame dimensions for the long bed frame.

help me out??
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