Looking for info on how much sag you had after adding a front bumper and winch. I am looking at IRO 3" coils, but may go with MC's 3.5" if there is a bit of sag.
Post up how much yours sagged and what springs you have please.

 

I put RE 4.5 coils in my XJ & it seemed to match the rear that has 6.5 springs. A few days/weeks later I noticed that it settled a good bit so I added 1.5 in. coil spacers to almost level it out. The cage may have helped in the sagging.
I'd get 4.5 in. coils.

 

Rustys has a set of 3" coils that are made for HD apps like this I got a set with my 3" lift kit they are still on mine even after an 1 1/2" more lift using them with an ACOS and a set of Boomerang Shackles. He offers a choice of the std or ones for a winch/bumper with his 3" kits.


The ride was a bit stiff for 2 weeks till I got the winch and bumper on the Jeep but after rode very well and still does almost 4 yrs now.

 

It depends on the spring rate of the coils. Higher Spring rate = less sag.

I had more lift with RE 3.5" springs than I did with RE 4.5" springs because of the spring rate, so i moved to RE 5.5" springs.

 

Yes the 3" Rustys coils come in 150# std duty and 180# for the winch/bumper combo setup they did not sag at all could be due to them being made in NA the only ones I think that are.