Oh wow. Never heard of that...Is this a daily driver or offroad toy? Maybe a combo of both? It doesn't really matter I guess but if you are not vertically challenged like myself and plan on driving it everyday go with the 2 1/2 inch. If not go for the 4 inch. If your rear springs are in good shape I would suggest doing a shackle flip in the rear. They will give you the lift you want plus better articulation. It basically turns the factory spring from being mounted above the hanger to below the hanger. I will track down a few links and post them here for you.
http://www.offroaddesign.com/catalog/shacklekit.htm I run these have good things about them (my truck is still in the garage).
http://diy4x.com/suspension.htm Also some good things about the ones from diy4X4 as well. They are about 3/4 of the way down the page and are shiny yellow.
Not sure about other places but Offroad design can also get you the front springs to match your rear shackle flip. And on the ORD page there is a link to the write-up on www.coloradoK5.com. If you cannot veiw the write-up (without joining) and want it let me know and I will try and copy it for you. Good luck.
Hey but that's an honest assessment from someone that's been there!Before you lift this truck you may want to think about a few things.
Suburbans get terrible mileage.
Suburbans handle like a fully loaded oil tanker.
Suburbans have a lack of power (B/B Suburbans are an exception).
Suburbans have marginal brakes (1500 series).
This is all before a lift, are you ready for it to get worse?
Suburbans arent the best vehicle to lift because of the problems listed above. I'd recommend buying replacement factory height springs, replace the rubber bushings in the suspension with new poly bushings, and find some decent 31" tires.
Yea I know not the popular path in this thread, but I've done to a Suburban what your thinking about, I no longer own that truck because I created to many issues by lifting it and grew tired of having to repair and upgrade.
I suspect you'll be much happier with you Suburban for a lot longer time if you keep it mild.
Oh wow. Never heard of that...
Yes..It would basically just be a weekend toy....and realistically....it will probably be ON the road more than off-road.
So you flip the rear springs...but install the 2 1/2 lift on the front springs....or flip them too???