IRO Benchmark Lift Questions -
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Unread 12-28-2013, 12:44 AM   #1
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1997 ZJ 
Join Date: Aug 2012
Location: Medford, Oregon
Posts: 22
IRO Benchmark Lift Questions

I've been scouring the web for a budget friendly, yet solid 3.5 inch lift for my '97 ZJ. I always hear good stuff about IRO and their 3.5" benchmark kit is just the right price. However, I don't understand how it works that the OEM front springs get moved to the rear, and new springs are put into the front. Wouldn't that make the Jeep unlevel? More stiff in the front than the back? Blablabla...I just figured that the OEM springs would be the same length front and rear. Can anybody clarify how it is possible to get a 3.5" lift and level ride by moving front springs back?

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Unread 12-28-2013, 05:00 AM   #2
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1998 ZJ 
Join Date: Mar 2013
Location: Alpena, Michigan
Posts: 169
If you look the front springs are significantly taller then the rear. So those will lift the rear 3.5" then you replace the fronts with new 3.5" springs.
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Unread 12-28-2013, 06:27 AM   #3
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Join Date: Jun 2004
Location: Phoenix, AZ
Posts: 5,886
You probably have the best front springs for a front to rear swap given that you have an I6. The V8 springs can lift considerably more.

Contact me via PM or email me at if you'd like an IRO lift. They are offering free shipping right now.
Kolak Performance and Offroad
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Unread 12-28-2013, 07:27 AM   #4
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1998 ZJ 
Join Date: Aug 2011
Location: Louisville, KY
Posts: 303
I bought a rough country 3.5" and did the f>r swap. The front sagged and needed spacers. Actually the kit came with 4" springs and 2 isolators just bc of the v8 weight. I went with iron rock 4.5" springs in the front instead with the factory front springs still in the rear and a 1.75" poly spacer added. Iro guarantees their springs to never lose more than 5% height or money back. Iro is good stuff.
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3.5" lift , lift advice , oem suspension , spring swap , zj

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