2003 Blazer LS 4 doorhas a lot of of suspension work to do and I'm wondering if I can upgrade to the ZR2 suspension. Is there anyone who knows how to/ and whether or not it's easily done?

Thanks in advance guys.

 

There is someone here who is doing exactly this. I think they had to get a ZR2 donor vehicle to do it right. The front suspension components for the ZR2 apparently don't just bolt on. They also have different rear springs and torsion bars.

And then if you get the larger rear axle with the lower gears (higher ratio like 4.11:1), you will have to get a front IFS with the same gears. The lower gearing is necessary if you are to run the 31" tires because the larger the tire, the higher the effective gearing.

This is why I will likely not go to any larger than my 30" tires with my 3.73:1 gears. With the larger tires compared to the stock 235/70 R15s, my 3.73:1 gearing is now more like 3.48:1. https://tiresize.com/gear-ratio-calculator/

 

I myself am doing this, not as into as others, but it "should" come out the "same".

I already have a 2.5 rough country lift with an add-a-leaf.

I am only putting in the rear axle and front diff.

I am measuring the rear leafs while the axles are out to see if it will be a "direct swap". But as in a recent thread, i believe it went right in. The front end has different mount locations, so would need to cut and weld those locations, and I can double check about CA sizes... I need to get the sway bar and mounts off them anyways... I'll be welding them on.

edit: I have a 99 but suspension is the same