Page 1 of 1

Shortening frame on J10

Posted: Sun Apr 29, 2018 6:07 pm
by Hendo2.5
Has anyone seen a good write up on converting a long box to a short box? I wanted a short bed but was only able to get a long bed. I'm thinking about shortening the frame but am not too sure where to cut or the right way to reinforce it. I believe the bed panels are just trimmed at the front. Thanks

Re: Shortening frame on J10

Posted: Mon Apr 30, 2018 8:39 am
by Stuka
When it comes to 74+ J-Trucks, only the front of the bed length changed (Wasn't the case with older trucks).

As for the frame, do you have a photo of your long bed frame? I have never looked at them side by side. But I THINK the length difference is after the frame starts to get wider. So, shortening it may not be as easy as with some other vehicles. But I could easily measure to some points on my truck to compare them to yours.

Re: Shortening frame on J10

Posted: Mon Apr 30, 2018 4:28 pm
by Hendo2.5
Mine is a 79. Here are some pictures of the measurements from the rear mount

Re: Shortening frame on J10

Posted: Tue May 01, 2018 3:48 am
by Hendo2.5
I think I have to move the cross member back

Re: Shortening frame on J10

Posted: Tue May 01, 2018 6:17 am
by Stuka
Did not have a chance to get out to measure yesterday, but I can definitely see differences in front of the tire, like where the front spring hanger is. Behind the axle looks identical.

Re: Shortening frame on J10

Posted: Tue May 01, 2018 7:43 am
by babywag
Take a look @ oljeep.com all the service manuals have frame dimension diagrams/info.
Should give you apretty good idea?

Re: Shortening frame on J10

Posted: Sat May 05, 2018 7:17 pm
by nightglide
On mine I just moved the front spring hangers forward.....the factory short box hole/dimple is already there. Then I used Ford Ranger shackle hangers for the rear. Then I should just have to cut off the rear of the frame. I havnt put the box on yet but I'm pretty sure its going to work.

Re: Shortening frame on J10

Posted: Sat May 05, 2018 7:17 pm
by nightglide
I'd post pics but have no idea how lol

Re: Shortening frame on J10

Posted: Sun Jun 03, 2018 11:45 am
by Hendo2.5
Does anybody know if the truck would pass safety with a modified frame?