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68 520 body mounts


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I removed the bolts for the rear cab mounts on my newly-purchased '68 this week and found this:




The pair in the front of the cab was even worse, and the pair at the front of the engine was not very good. I was really surprised, as this is essentially a rust-free truck with a super clean underside. It seems like the rubber must be absorbent and just rots the heck out of the bolts. Check yours today! I replaced all the bolts with new grade 8 hardware. For under the cab, I used 7/16" x 4". The shoulder where the threads end matches the shoulder on the stock bolt. The front pair was 3/8" x 2-1/2".


For lower cushions, I used a quartet of 40mm x 30mm rubber isolators. If you search for "40mm 3mm rubber isolator" on eBay or Amazon they will come up. The dimensions are almost exact to stock (Diameter: 1.6" x Height: 1.2" vs. 1.5" x 1.25"), but I especially like that the durometer, at 55A, also matches stock. In addition, they have fused metal plates at top and bottom, like stock. They do require slight modification. They come with an M8 threaded hole in the center. I drilled this out, in two stages, first with a 5/16" bit and then with a 7/16" bit. You might not need two stages, but I was worried about tearing the plates loose.




Hope this is helpful to someone.




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