[QUOTE=Chuck78;3288291]Wow, this guy just gained a customer here from his email response to me. This answers a lot! I asked if he had the thicker bed mounts that are about a half an inch, like what I need for my panel vs the 1/4" pads that I got apparently for a pickup application. This is what he said:
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Hi, Chuck
The 1960-72 Suburban / Panel truck body mounts were last available through GM up until about a year ago when the last available were finally sold. These are the mounts you need, and when new they are actually more like 3/4"-1" in thickness not a 1/2" and have a steel sleeve molded into the bottom cushion that is slightly taller than the cushion and the top cushion has a small depresion in it that the round steel sleeve fills when they are mounted and tightened. We have heard that there is a company having a manufacturer reproduce these and we expect them out sometime this year but it looks as though it will probably be late summer or sometime in fall at earliest before they become available.
Have a nice weekend!!!
My Very Best
Paul @ GMCPauls
Online Catalog-
http://www.gmcpauls.com
GMCPauls Truck Parts
505 Adams Drive
Rockville, IN 47872
Fax: 773-442-0103
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That answers a whole lot, as my mounts must be really smashed down and rotted! I think this amount of lift would fix my problem, or at least allow the bed to sit level. I still think that the one cross sill in question (that is currently sitting at the high point of the frame over the axle) would be touching the frame with no room for any rubber mount, however. I still think that it had to have been mounted in a different location, like one set of "skid rail" bolts back.
I did see a few sources that had mounts that looked like the ones I needed, but they did say 67-72 Suburban I believe. That was only one place out of all the truck restoration parts suppliers that I had looked into.
that is basically what I told you on the 60-66 site. I am glad that they are going to be reproducing them. following excert from an old GM man
Ron, this is Lewis. Please forgive me for not getting back sooner, but I have been busy in my work for the church I serve. I checked both my 65-66 parts manual and my 67-72 parts manual. This is what I discovered: 1964-6 body mounts are p/n 3794779, w/dimentions of 1.76" w; 3.00" l; 0.92" thick, needing 8 (up & lwr same). The 67-8 p/n is 3909351 up & lwr, 69-72 uses 3909351 as the lwr, but p/n 3946246 is the upr. No dimentions are given for these cushions, and it seems that the frame changed in '69. Qty's in 67-8 are 16, with 69-72 requiring 10 of each. If you have dimentional axcess to the later cushions, these 64-66 dimentions should help you. Like you, I suspect that the 67-8 cushions will work, but there is no superseded p/n's between the body styles. I can tell you that years ago I bought cab mounts for my 65 and the p/n's had superseded to the mounts for the 67-72 cabs. I hope that this info is of some assistance in answerring this question.
the good ones that I have measure about .720" thick but if one measures in the round raised protrusion( around the bolt hole) that was mentioned earlier
Lewis's measure of 0.92" thick would be correct
ron