Lift and Re-Gear at the Same Time
If bigger tires are in the plan, gears are in the plan. Here's why the smart move is doing both while the truck is already on the rack.
The short version: lifting and re-gearing share most of the same shop labor — driveshafts out, wheels off, alignment, speedometer recalibration. Do them in one visit, and you pay for that work once instead of twice.
The Expensive Way to Get There
Order a lift. Order tires. Drive it for four months getting increasingly annoyed. Order gears. Pay a shop to take half of it apart again.
It works. It's just the long way around to a place you were always going to end up.
Still deciding whether your tire size even justifies a re-gear? Our friends at ICON Vehicle Dynamics covered that from the suspension side: Should I re-gear my rig after I've lifted it?
What You Pay For Twice
Suspension work and differential work aren't the same job, but they touch a lot of the same hardware:
| Shop step | Lift | Re-gear |
|---|---|---|
| Wheels and tires off | Yes | Yes |
| Driveshafts out | Often | Always |
| Front hub / brake work | Often | Yes (IFS) |
| Alignment | Required | — |
| Speedo / ABS / TCM recalibration | Yes (tires) | Yes (ratio) |
| Differential fluid service | — | Included |
Combining the two commonly recovers several hours of duplicated labor — often a meaningful chunk of what the gear set itself costs.
Tech Note — The Break-In Window
New gear sets need a break-in: easy driving, heat cycles, no towing for the first few hundred miles. New suspension wants a settling period too — springs taking a set, bushings seating, an alignment recheck. Do both jobs together and those two quiet periods become one.
What You Catch by Doing Them Together
- Pinion angle gets set right the first time. Lifting a solid axle rotates the pinion. If the axle is already open, correcting it is part of the job — not a return visit for a vibration complaint.
- You find what's actually worn. Cover off, carrier out, and worn bearings or a tired limited-slip stop being guesses.
- Front and rear stay matched. Mismatched 4WD ratios bind the transfer case. One project makes that hard to get wrong.
- Carrier breaks get sorted up front. A Dana 44 built around 3.73s won't take 4.88s without the right carrier or a thick-cut set. Better found in planning than mid-install.
Build the Parts List in This Order
- Tire size first. Everything downstream depends on it — ratio, lift height, clearance work.
- Suspension to fit the tire. Travel, spring rate for your real load, and corrected geometry matter more than inches.
- Calculate the ratio. Then order gears and install parts together.
- Handle anything else the axle needs. Chromoly shafts, a locker, a heavy-duty diff cover. If the axle is open, this is the cheapest those upgrades will ever be.
Target ratio = current ratio × (new tire ÷ old tire)
Running 3.55s and going from 31s to 35s? 3.55 × (35 ÷ 31) = 4.01, so 4.10s. Our gear ratio calculator does the math for you.
Step 2 — Suspension
ICON Suspension Systems
Engineered as matched packages. Their shocks and coilovers are where ride quality lives, and heavy tires load the steering hard.
Steps 3 & 4 — Drivetrain
Yukon Re-Gear Kits
585+ applications. Gears plus the bearings, shims, seals and crush sleeve — often a posi — so the shop isn't stopping mid-job.
One Family, Two Disciplines
Yukon Gear & Axle and ICON Vehicle Dynamics are both RANDYS Worldwide brands, alongside Dynatrac, Carli Suspension, Cognito Motorsports and USA Standard Gear.
That's why this article exists. We spend a lot of time on the phone with customers reverse-engineering a gear ratio out of a build that was never planned as a whole. Having drivetrain and suspension engineering under one roof means we can tell you what the other half of your truck needs — not just sell you our half.
If You Have to Split It
Budgets are real. A $2,000 gear job on top of a suspension system is a lot in one month.
Do this: suspension and tires first, gears second — and put the gear job on the calendar before the tires go on.
Don't do this: re-gear first for a tire size you haven't committed to. Guessing at a ratio is the one version of this that guarantees doing it twice.
Frequently Asked Questions
Is it cheaper to lift and re-gear at the same time?
Usually. Both jobs share driveshaft removal, wheel removal, alignment, and speedometer recalibration. Combining them removes the duplicated labor.
How long does a re-gear take?
Typically a full day of shop time for front and rear, plus a few hundred miles of light-duty break-in before towing or hard use.
Do I need to re-gear both axles?
Yes. Front and rear ratios must match on a four-wheel drive. Mismatched ratios cause driveline bind and component failure.
What's the difference between a gear set and a re-gear kit?
A gear set is the ring and pinion only. A re-gear kit adds the bearings, shims, seals, and crush sleeve needed to install it — often a posi or locker as well.
Should I re-gear before or after installing bigger tires?
Calculate the ratio from the tires you're committing to, then install both together if you can. Never re-gear for a hypothetical tire size.
Does a lift kit change my gear ratio?
No. Ride height has no effect on ratio. Tire diameter does — a taller tire lowers your effective final drive, which is what makes a lifted truck feel sluggish.
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