Last updated: September 2026 Written by the LiftKitGuide Team, truck suspension installers and editors
A lifted diesel truck needs diesel-rated front springs, because Cummins, Power Stroke and Duramax engines put several hundred pounds more weight on the front axle than gas engines. Most builds run 2.5 to 6 inches on 35 to 37 inch tires and cost $2,500 to $10,000 installed, before wheels and tires.
Key takeaways
- Diesel heavy-duty trucks need lift kits with diesel-specific springs, and most brands sell separate diesel and gas kits for the Ram 2500, F-250 and Silverado or Sierra HD.
- A 2.5 to 3 inch lift fits 35-inch tires and keeps towing manners close to stock, while 6 inches fits 37s but raises the hitch and usually needs driveline work.
- Rough Country’s 6-inch kit for 2017-2022 F-250 and F-350 4WD is diesel only and rated for tires up to 37×12.50R22, per the manufacturer.
- Lifting a diesel does not change its tow rating, but taller tires reduce effective gearing and a raised hitch needs a drop hitch.
- Removing or modifying emissions equipment is illegal under federal law, even though suspension lifts are legal in most states within height limits.
On this page
This guide covers why diesels lift differently, the most common platforms, lift heights and tires, towing, costs and the legal side. It is written for owners of three-quarter and one-ton diesel pickups.
Why do diesel trucks need different lift kits?
Diesel trucks need different lift kits because the engine is much heavier than a gas V8. A 6.7L Cummins, 6.7L Power Stroke or 6.6L Duramax adds several hundred pounds over the front axle compared with the gas engine in the same truck. Gas-rated springs would leave a diesel sitting too low, and diesel springs would leave a gas truck sitting too high.
That is why brands like BDS sell separate diesel kits. BDS’s 3-inch Ram 2500 kit, for example, uses diesel-specific Pro-Ride coil springs and is listed for diesel engines only. Always match the kit to your engine before ordering.
Which diesel trucks get lifted most?
The diesel pickups lifted most often are the Ram 2500 and 3500 with the Cummins, the Ford F-250 and F-350 with the Power Stroke, and the Chevrolet Silverado and GMC Sierra 2500HD and 3500HD with the Duramax. Each platform lifts differently.
- Lifted Cummins (Ram 2500/3500): solid front axle on coil springs. Easy to lift, but sensitive to track bar and steering wear. See our Dodge Ram 2500 suspension lift guide.
- Lifted Power Stroke (F-250/F-350): solid front axle on coils with radius arms and a track bar. Our 2017 F250 lift kit guide covers the 2017-2022 trucks.
- Lifted Duramax (Silverado/Sierra HD): independent front suspension with torsion bars. Lifts use knuckles and crossmembers, and torsion key levels are common.
How much should you lift a diesel truck?
A diesel truck that tows should stay at 2.5 to 3 inches of lift on 35-inch tires. That height keeps hitch height, driveline angles and handling close to stock. A 6-inch lift on 37s is for trucks used mostly for looks or off-road, not heavy towing.
For a diesel that pulls a fifth wheel or gooseneck, a 2.5-inch coil level with 35s is the better choice because it keeps the truck stable, avoids driveshaft vibration and saves $2,000 or more.
| Lift | Typical parts | Realistic max tire | Parts price | Best for |
|---|---|---|---|---|
| 2-2.5 in. level | Leveling coils or torsion keys | 35 in. | $150-$2,000 | Towing, daily driving |
| 3-4 in. | Coils, shocks, track bar, arms | 35 in. | $1,300-$5,500 | Balanced towing and looks |
| 5-6 in. | Coils, radius arms or knuckles, track bar, driveshaft | 37 in. | $2,500-$7,000 | Looks, off-road |
| 7-8 in. and up | Full custom kits, long arms | 37-40 in. | $5,000-$12,000 | Show trucks |
What changes when you lift a diesel?
Lifting a diesel changes towing, fuel economy, gearing and wear. Know these before you spend money:
- Towing. The tow rating stays the same, but a taller hitch needs a drop hitch, and tall tires add sway.
- Fuel economy. Expect a 1 to 3 mpg drop with 35 to 37 inch tires.
- Gearing. Factory 3.42 to 3.73 gears feel slow with 37s. A regear to 4.10 or 4.30 costs $2,000 to $3,500.
- Front end wear. Heavy diesels on big tires wear ball joints, tie rods and track bars faster.
- Tire load rating. Use E-rated or higher tires sized for the truck’s weight.
Safety note: A diesel on a lift and big tires is heavy and tall. Get a professional alignment, check brake line slack, and confirm tire load ratings before towing.
Which diesel lift kit brands are worth buying?
The right diesel lift kit brand depends on truck, budget and towing needs. Prices are typical 2026 street prices.
| Brand | Lift range | Price range | What’s included | Best for | Not good for |
|---|---|---|---|---|---|
| Rough Country | 2-6 in. | $150-$2,500 | Spacers, coils, brackets, N3 shocks | Budget builds | Premium ride |
| BDS | 2-8 in. | $500-$7,000 | Diesel coils, radius arms, track bars, Fox options | Daily drivers | Buyers under $1,000 |
| Carli | 2.5-4.5 in. | $2,000-$10,000 | Coils, radius arms, King or Fox shocks | Towing and ride quality | Big show lifts |
| Thuren Fabrication | 2-3 in. | $900-$5,000 | Coils, shocks, track bar | Heavy towing | Tall lifts |
| Fabtech / Cognito (GM HD) | 3-7 in. | $1,500-$6,000 | Knuckles, crossmembers, torsion parts | Duramax trucks | Solid-axle trucks |
How much does it cost to lift a diesel truck?
Lifting a diesel truck costs about $600 to $2,500 installed for a level, $2,500 to $7,000 installed for a 3 to 4 inch lift, and $4,000 to $10,000 installed for a 6-inch lift. Wheels and 35 to 37 inch tires add $2,500 to $6,000. Labor runs $100 to $175 per hour, based on typical US shop labor rates in 2026. See our suspension lift kit installation cost guide for details.
What should you check on a used diesel that is already lifted?
Check the suspension brand, the front end and the emissions system before buying a used diesel that is already lifted. A cheap lift on a heavy truck often hides expensive problems.
- Kit brand and receipts. Ask what kit was installed and whether it was diesel-specific.
- Steering and track bar. Look for play in the tie rods, ball joints and track bar. Death wobble repairs can cost $500 to $2,000.
- Driveline. Test drive at 40 to 70 mph and feel for vibration from the driveshafts.
- Tires. Cupped or inside-worn tires point to alignment or worn parts.
- Emissions. Confirm the DPF, EGR and SCR systems are intact. A deleted truck may fail inspection and can be expensive to restore.
If the seller cannot say which kit was used, budget for a full front-end inspection before you pay.
Is a lifted diesel legal?
A diesel truck with a lift is legal in most US states as long as it meets state limits on bumper height, frame height or headlight height. Those limits vary widely, so check your state’s vehicle code before going past 4 to 6 inches.
Emissions work is different. Removing or disabling the DPF, EGR or SCR system, often called a delete, is illegal under the federal Clean Air Act, and the EPA has fined shops and sellers heavily. A suspension lift does not require any emissions changes.
How do you plan a diesel lift build?
Planning the build in the right order saves money and avoids buying parts twice.
- Decide what the truck does most: tow, daily drive, off-road or show.
- Pick the tire size that fits that use, usually 35 inches for towing trucks.
- Choose the smallest lift that clears that tire with the right wheel offset.
- Buy a diesel-specific kit that matches your engine, drivetrain and trim.
- Replace worn steering and front-end parts during the install.
- Budget for an alignment, speedometer correction and a drop hitch.
- Regear if you run 37-inch tires or tow heavy with 35s.
- Retorque the suspension after 100 to 500 miles.
Frequently asked questions
Do diesel trucks need special lift kits?
Yes. Diesel trucks need kits with diesel-rated springs because the engine adds several hundred pounds over the front axle. Most brands sell separate diesel and gas kits for the Ram 2500, F-250 and GM HD trucks. Installing gas springs on a diesel leaves it sitting too low in front.
Does lifting a diesel truck reduce towing capacity?
No. The factory tow rating depends on the frame, axles, hitch, brakes and GVWR, which a lift does not change. A lift does raise the hitch and add sway with tall tires, so use a drop hitch, E-rated tires and keep the lift at 3 inches or less for heavy towing.
What size tires fit a diesel truck with a lift?
35-inch tires fit most leveled or 3-inch diesel trucks, and 37-inch tires fit most 5 to 6 inch lifts. Exact fitment depends on wheel offset and truck model. Thirty-seven inch tires usually call for new gears on heavy diesels that tow.
Is it legal to lift a diesel truck?
Yes, in most states, within height limits. States set rules on bumper, frame or headlight height, and those vary. Emissions deletes are a separate issue and are illegal under the federal Clean Air Act, regardless of lift height. A lift kit does not require any emissions changes.
How much mpg does a diesel lose after a lift?
About 1 to 3 mpg. Bigger, heavier tires add rolling resistance, and a taller truck catches more wind. A 3-inch lift on 35s usually costs about 1 to 2 mpg, while a 6-inch lift on 37s can cost 3 mpg or more, especially without a regear.
The bottom line
The best lifted diesel setup for most owners is a 2.5 to 3 inch diesel-specific kit on 35-inch tires, which keeps towing safe and costs far less than a tall build. Match springs to your engine, fix worn steering parts first, and keep the emissions system intact.
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