Frame ques on Fiberglass tub

Got a question for the early owners, I am finalizing my 72. I bought a fiberglass tub a year ago, it has the squared off center section just like the original but I have an odd fitment issue. if I use the 1/2 mounts for the extreme rear mount aka the rear crossmember ones, then the ones at the rear wheelwells are 2", the 4 middle ones are 3 1/2" and the front grill one is 2". I know from factory all my mounts were the same thickness like 1/2" or so. I have bought a set.

Now, I think I can get around this by fabbing up some 3x3x3 steel perches to lift the center mounts, use 1 1/2" rubber round for the wheelwell and the grill section.

My question is this, could this be a body for the pre-72 models? do you guys know if the tail section of the pre 72 frames drop about 2" or so as compared to the intermediate 72-75 frame? Im just wondering cause this is just wierd. Like I said I am gonna get around it with some fabbing I just wondered if its normal or a glass tub thats not molded right.

The tub was virgin when I bought it but not new, they guy I got it from bought it on a 78 frame as a project and was going to a steel body so thats how I got it. nothing was marked or cut to indicate firewall cutout, only holes were what the PO mounted it to the 78 frame, but it is def not a 76 up tub, they have that round center section, not the low square one like mine.

 

It does, I just cant figure why this particular tub apparently goes so low in the back.

Ahh no matter I just got my cubes fabbed up, pretty easy used 3" square tube and plated over one end to add extra strength.

I just feel this would be better than 4 1/2" bolts to hold the body on and keep from flexing on the trail.

Im going to mount the "box" to the mount surface of the frame, then sandwich a tire rubber between it and the body where the wooden mount section is. another stumbling block out of the way.

thx

 

Could you give a aprox. height of the mounts my back ones also seem big.

 

Wow, Lynn sounds like you tub is just like mine.

I am welding a couple tabs on the rear crossmember to fasten those, they will be the standard 1/2" ones I got in this mount kit. from there forward, the next 2 are 2", I am using the salami rubber for those 2. the next 4 are the same on mine and all quite tall, If I were to use the rubber it wouldve been a 3" - 3 1/2" salami but I wasnt too keen on having them that tall so I fabbed up a frame mount extenter box to "raise" the mount by 3", from there Im gonna use a tire rubber to sandwich it there. the last two for the factory tub wont work because the glass tub doesnt have those panels that extend down from the firewall, Im gonna have to rely on the rest which I dont think Ill have any problems.

 

Can you post photo with salamis on mounts without body on that would be a great reference

 

Tell ya what,

I am going to remove the body one last time(hopefully) this Sunday to take it to the shop for cage fitment, When I pull it off, Ill take some pics of what I am doing, they wont show bolts obviously cause no tub, but Ill try and show you what Im setting up.

 

on my fiberglass tub, the front 4 are 3" and the rear 2 are 2". i had to lift the body to fit the th350 in. if you're looking for a cheap, but reliable alternative to the rubber salami from 4wd, you can try hockey pucks. they are exactly 1" each.

 

that would be great 72cj5er thanks

 

Is the tub mounted level to the ground or parallel to the frame?

 

umm, if you have correct suspension and all same size tires, both.

The frame should be level in the mid section in any case.