I would say that suspension might add some weight, but I would guess at the most 50lbs over a dana 60 with leaf springs.

My guess is a whole lot more, are you forgetting the frame clip needed for the IRS?

I would think that it would add weight in the right area though as most iron block cars are what a 60/40 split front/rear?
This IRS may just make it easier for a car to be 50/50.

Too bad it takes a lot of mass off the wallet as well haha!

Well, if adding weight to the back to get 50/50 is all that you're concerned about fill the trunk with concrete.

Yeah, I know foolish, but putting a heavy rear suspension in to accomplish the same goal is about as foolish too. Now if the heavier rear suspension markedly improved the handling and ride, and that is the question at hand for an E body here, then go for it.

But less weight generally helps handling more than increasing weight.

I don't know where y'all are finding prices and weights, but the picture I see doesn't show brakes or shocks or springs, which will add to the weight. I also don't know why one would compare it to a stock Dana 60 setup either, not what I'd choose in a handler myself. In fact one could make a very cogent argument that the 8 3/4 is a better choice to ease gear changes for different type races and lighter in weight and most like more than strong enough for a handler.

It costs 12K so it must be awesome. And the 250 lbs it adds only makes the handle better to.

We also have to consider anyone spending big bucks on this type of setup will automatically say how great is is (smart they were). Bucks = happiness for many. We all work hard for our bucks. Now if an actual heavy hitter racer who had driven different setups in the same car would say WOW! what a setup, then it really holds some weight for me. So many times I see the average hot rodder wanna be say good things about their new toy. The more expensive the more they overstate. Just human reaction for many. I get it.

Bought a set of Fox 2.0 shocks with the resivours for my 2006 Ram 4x4 diesel. Hundreds of positive things on the net about ride improvements on road. Just installed them. The ride is super stiff. The tire leaves the road on small sharp bumps and sometimes the truck moves sideways. Scary. I have to pay attention at all times just in case. Great more stress in life:-( Can't wait to take them off and send them back.

NOT saying this is one of those things but i'm in my skeptical corner.

Damon

Supposedly custom for Thuren.