Join Date: Dec 2001
Location: Belleville, Illinois
Thanked 22 Times in 17 Posts
Re: Calling all Engineer types !
Solid-mounting is not viable. The frame will flex, and if it forces the body to flex at the mounts, the body will fatigue crack.
Hockey pucks are sometimes used, but I suspect that they are too hard, and will also cause fatigue cracking. I've also heard that they can crack and fall out.
Cheapest I have ever heard of, that might work OK, is rollers from a boat trailer. They are about 2" in diameter, and 6" long. You can slice off biscuits as tall as needed.
Remember that you must have either the frame or the body sandwiched between rubber biscuits. You can't just put rubber between the frame and the body, and bolt it together.
Frankly, I think that I would use urethane body mounts designed to be direct replacements for the stock items. Body mounts are more than just rubber donuts - they are designed and placed to handle the relative movement between frame and body at each location on the body. A CJ7 uses nine mounts of three different configurations. They could have just used one body mount style, but didn't. My guess is that they had a good reason.
Also, I suspect that urethane mounts are softer than trailer rollers. That's one place where softer is better, up to a point.