78 Body Mount/body alignment questions

[edward Kish]

Hope you guys can help so I don't lose my mind. After 3 months of hard work, my truck is so close to being finished, but I'm having body alignment issues.

First question: I got a brand new set of body mounts when I bought the truck, but no hardware or instructions. Four of the mounts are identical, and about an inch or so thick (tall?), and two are about twice as big. I cannot for the life of me find anywhere online that says definitively which location gets the larger mounts/bushings.

Second, I'm having a heck of a time getting the body lines lined up. Keep in mind, I replaced the entire lower floor (including floor support, frame support etc.) I also did some fab work on a few of the mounts on the frame that were rotted out (particularly the radiator supports). I'm fairly certain that everything went in at the right height, but I could obviously be wrong. Is there any resource that lists clearances and measurements to align the body with itself/the frame? I'm thinking like, "distance between lowest point of floorboard and top of frame should be X inches".

Any help would be appreciated-thanks guys!

 

[AuroraGirl]

perhaps the body mounts that are larger fit in the front where the frame swoops down? so those mounts need less distance than the ones where the frame is parralel as high as it goes with the bed to the rear, the bed should sit higher than a cab with no mounts i would think

 

[edward Kish]

For future searchers, here's a few diagrams I finally found that I think are going to help (still messing with it)

https://www.lmctruck.com/1973-87-ch...frame-mounting-hardware-radiator-core-support

https://www.energysuspensionparts.com/installation_instructions/energy_suspension/17011.pdf

 

[Bextreme04]

The smaller ones are for the front cab mount and the core support mount. They are very similar. The large ones are for the rear cab mounts. If you don't have any of the washers, sleeves, or bolts I would recommend you just buy the complete body mounting kit from LMC. You have to have the sleeves and bolts, the rubber mounts won't do you any good without them.