← All Articles
CJ Spring-Over Conversion: How to Spend a Weekend and All Your Money
Suspension

CJ Spring-Over Conversion: How to Spend a Weekend and All Your Money

Jason
Jason • February 26, 2026

The spring-over-axle (SOA) conversion is the most popular way to lift a CJ, primarily because it's the cheapest option that still sounds impressive when you tell people about it at car shows. "Yeah, I did a spring-over" sounds way cooler than "I moved the springs to the other side of the axle and now everything else needs to be modified too."

What Is Spring-Over?

Stock CJs have the leaf springs sitting under the axles. In a spring-over, you flip them on top. Boom — 4-6 inches of free lift.

"Free."

Let me explain what "free" means in CJ terms.

The "free" lift:

  • New spring perches (welded to axles): $30-50
  • Longer U-bolts: $20-30
  • So far so good, right?

What the "free" lift also requires:

  • Dropped pitman arm: $60-80
  • Extended brake lines: $40-60
  • New driveshaft or SYE kit: $150-400
  • Longer shocks: $100-200
  • Bump stop extensions: $20-30

What you'll discover you also need once you start:

  • New U-joints (since you're under there anyway): $40
  • That one spring bolt that rounds off: $15 + 2 hours + swearing
  • Replacement for the brake line you kinked: $25
  • A welder, because you don't have one: $400-800
  • Pizza for the buddy who does have a welder: $25

Actual cost of the "free" lift: $900-1,700

Your wife saw the original parts list totaling $50. Every subsequent purchase will require an explanation. By the fourth trip to the parts store, stop explaining. Just go.

Parts List (The Honest Version)

Required:

  • Weld-on spring perches: $30-50/pair
  • Longer U-bolts: $20-30/set
  • Dropped pitman arm: $60-80 (NOT optional unless you enjoy death)
  • Extended brake lines: $40-60 (also not optional unless you enjoy death)
  • Longer shocks: $100-200

Strongly recommended:

  • YJ leaf springs (better ride): $200-400/set
  • SYE kit or new driveshaft: $150-400
  • Steering stabilizer: $40-60
  • Anti-wrap traction bars: $100-200

Things you'll end up buying at 8 PM on Saturday when everything is closed except the one auto parts store with a surly teenager working the counter:

  • Penetrating oil (PB Blaster, 3 cans minimum)
  • Replacement hardware for bolts you destroyed
  • Bandaids
  • More penetrating oil

The Process (Abridged)

Day 1 (Saturday, 8 AM, Full of Optimism)

  1. Lift the Jeep, remove wheels. Think "this is going to be easy."
  2. Try to remove spring bolts. Discover they've been rust-welded in place since 1983.
  3. Apply PB Blaster. Wait. Apply more. Wait. Apply more.
  4. Break the first bolt. Drive to parts store.
  5. Get the springs out by 2 PM. Ahead of schedule! (You are not ahead of schedule.)
  6. Grind old perches off the axles. This takes twice as long as you expected.
  7. Weld new perches on. Or watch your buddy weld while you hold things and try to look helpful.
  8. Reinstall springs on top of axle. This part actually goes pretty quickly and you briefly feel competent.

Day 1 (Saturday, 6 PM, Reality Setting In)

  1. Realize you forgot to order the dropped pitman arm.
  2. Amazon Prime won't get it here until Tuesday.
  3. The Jeep is on jackstands with no wheels. It will remain this way.
  4. Your wife asks when you'll be done. You say "tomorrow" with the confidence of a man who has never done this before.

Day 2+ (The Extended Cut)

  1. Pitman arm arrives. Install it. Wrestle with brake lines.
  2. Discover the driveshaft vibrates at anything over 35 mph.
  3. Order an SYE kit. Wait 5 more days.
  4. Final assembly and first test drive.
  5. Something clunks. Spend 3 hours finding a loose U-bolt.
  6. Second test drive. It works. You're 2 weeks past your "this weekend" estimate.

YJ Spring Swap

Many CJ owners use YJ Wrangler springs instead of reusing the stock CJ springs. YJ springs are longer, which improves ride quality from "jackhammer" to merely "aggressive massage."

  • YJ front springs bolt directly to CJ frame mounts (something actually fits without modification — mark your calendar)
  • YJ rear springs need the rear shackle mount moved about 1.5"
  • Adds 1-2" of additional lift

Common Mistakes

  1. Bad welds on perches — these hold the entire vehicle up. If your welding looks like a bird pooped metal, hire someone.
  2. Skipping the dropped pitman arm — the resulting bump steer will make the vehicle actively try to kill you
  3. Not extending brake lines — your stock lines WILL rip off at full droop, preferably on a hill
  4. Telling your wife the real total cost — rookie mistake

Was It Worth It?

Yes. Every SOA CJ owner will tell you it was worth it. They'll just conveniently forget to mention the extra week it took, the four trips to the parts store, and the $1,500 that was supposed to be $50.

But the first time you air down, engage 4-Lo, and crawl over something that would've been impossible before — you'll forget all of that too. Then you'll start thinking about bigger tires. And the cycle continues.

Welcome to the hobby.