That sounds like a great idea for me to put away in my head.

Just in case I need some material to machine up into something.

The three inch diameter of any round stock is a nice size to have laying around a lathe or milling machine.

Let me get this straight.

The reason I ask is I have never notice how that setup works up in there. I changed out a set of TAB's to long ago to remember.

I am totally lost as I thought the spring itself is larger than three inches.

Did you put it between a steel cupped retainer for the spring and the frame with a bolt through it?

Or is there a rubber cushion plate up there that the spring sits in?

I have raised two cars, both sedans, the old fashioned way by using stiffer springs. Two sets came off of 245 wagons. One was a junkyard set.

I Purchased a set of IPD's overloads to put back my personal wagon, that I stole one set from.

They have a wee bit more stiffness than original wagon springs. I know this when the wagon is totally empty. An extra 50 to 100 pounds is perfect for around town.

The IPD's were too harsh for my comfy and quieter sedans.
My old neck didn't like the surprise hop, going over store front speed bumps.

Your spacer idea is definitely a good way to come up with affordable spacers and keeping the ride comfy! I couldn't think of a material that I would put under there except rubber. Then where to get a chunk in my remote area.

Does it isolate any noise? Can't say I have ever held one before.

Did you cut the quarter inch off right away for a reason or tested it with the full inch first?

Phil