Used Jeep 4.0L PowerTech I6 for Sale — VIN-Verified.
VIN-verified, road-tested used gas engines for cars, trucks, and SUVs — matched to your exact vehicle and backed by a real warranty. 0% restocking, ever.
Used & remanufactured Jeep 4.0L PowerTech I6 — VIN-verified, tested, and shipped nationwide from our Pasadena, TX facility. Fits Jeep Wrangler TJ/JK, Cherokee XJ, Grand Cherokee, Comanche.
The legendary 4.0L PowerTech inline-six powers Wrangler TJ/JK, Cherokee XJ and Grand Cherokee, and remains in high demand for its durability. We VIN-verify the exact year since intake style (early vs later HO), sensors and injection changed across the production run, and later 0331 casting heads are known to crack, so we inspect head condition and run compression and leak-down testing before shipping. Confirm your Jeep's year and model for an exact match. Ultra Auto Parts TX is Houston's drivetrain specialist, supplying quality used and remanufactured gas engines out of our Pasadena, TX facility at 5041 Spencer Hwy, Ste 101. Every engine we sell is sourced, inspected, and VIN-verified against your specific vehicle before it ships — no random salvage guesswork. As a used-engine dealer serving the greater Houston area, we test compression, run leak-down and bore-scope checks, and confirm mileage so you know exactly what you're buying. Whether you drive a Chevy Silverado, Ford F-150, Toyota Camry, Honda Accord, or a Nissan, Dodge, GMC, or Jeep, our bilingual English/Spanish team helps you find the right long block or complete drop-in engine. Send us your VIN and we'll match the correct engine family, displacement, and options so it bolts in right the first time.
Known issues we check on the Jeep 4.0L PowerTech I6
The 4.0L PowerTech is legendary for durability, but we verify the exact year since intake style (early vs later HO), sensors, and injection changed across the run. The later 0331-casting heads are known to crack between cylinders 3 and 4, so we inspect head condition closely, along with the rear main and oil-filter-adapter leaks these develop. Every 4.0 gets a compression and leak-down test in Pasadena before it ships.
Used vs. remanufactured Jeep 4.0L PowerTech I6 — which to buy
A tested used 4.0 is a strong value on this durable inline-six when the head checks out, and ours are inspected for the 0331 crack issue first. Remanufactured makes sense on a high-mileage Jeep where you want a fresh head and baseline with a longer warranty. We carry both and VIN-match the exact year. Send your VIN and we tell you honestly which fits your Wrangler, Cherokee, or Grand Cherokee.
Why buy a quality used engines?
A quality used engine is the smart middle ground between an expensive brand-new crate engine and a risky unknown. You get genuine OEM components engineered for your exact platform — correct block, heads, and sensor locations — at a fraction of new-engine cost. Low-mileage salvage engines pulled from wrecked-but-running vehicles often have plenty of service life left, and because they're OEM, fitment and reliability beat generic aftermarket overhauls.
Common signs you need a replacement
Most drivers come to us after a blown head gasket, a spun rod bearing (rod knock), cracked block from overheating, a thrown timing chain, or oil-starvation damage. High-mileage engines burning oil or losing compression are common triggers too. When the repair bill approaches the engine's value, a VIN-matched used replacement is usually the faster, more affordable path back on the road.
| Feature | Ultra Auto Parts TX | Typical salvage yard |
|---|---|---|
| Restocking fee | 0% — ever | ~20% |
| Warranty | 6 mo – 3 yr | 6 mo flat |
| Fitment | VIN-verified to your vehicle | Not verified |
| Drivetrain testing | Specialized per component | General salvage |
| Service | Bilingual · 10-min response | Varies |
Quick Quote Fastest lead
Send Name + Phone + Part + ZIP. VIN recommended for exact fitment.
Fitment Flags We Check
- LS 5.3 vs 5.7 (LM7 vs LS1) — different displacement, blocks and accessories don't freely interchange
- VVT vs non-VVT variants — cam phaser and controller differences change fitment and wiring
- Flex-fuel (E85) vs standard gas — different injectors, sensors, and calibration
- 8th digit of the VIN identifies the engine code — always confirm it matches
- Truck vs car/SUV accessory brackets, oil pan, and intake can differ on the same engine family
- Early vs late LS (24x vs 58x reluctor) affects harness and PCM compatibility
What to send for an exact quote
- VIN (best)
- year/make/model
- engine size
- trim
- mileage expectation
Every used gas engine ships with a standard 6-month warranty, extendable up to 3 years through our tiered warranty options. And we charge a 0% restocking fee on all returns — no penalties, ever.
Local Houston-area delivery is FREE with our own drivers; regional and out-of-state shipping is available for a quote — ask us for your exact rate.
How It Works
FAQ — Used Engines in Houston, TX
Where can I buy a used Jeep 4.0L PowerTech engine near me in Houston?
Ultra Auto Parts TX stocks tested 4.0L PowerTech inline-six engines at 5041 Spencer Hwy Ste 101 in Pasadena, near Houston. We offer free local Houston delivery and nationwide shipping, open Monday through Friday 8 to 5 Central, English and Spanish. Call or text 281-436-9991 with your VIN.
How much does a used Jeep 4.0L engine cost?
Price depends on the year, head condition, and used vs remanufactured. We never quote from memory — send your VIN to 281-436-9991 for the correct tested unit. Every order carries a 0% restocking fee, so there is no risk if plans change.
How do you verify a 4.0L PowerTech fits my Wrangler or Cherokee?
We VIN-match the exact year, since intake style, sensors, and injection changed across the run, and we inspect the 0331-casting heads for the known crack. Send your VIN to 281-436-9991 to confirm fitment from Pasadena.
Ultra Auto Parts TX is a used and remanufactured drivetrain-parts dealer in Pasadena, TX (Houston metro). 5041 Spencer Hwy Ste 101, Pasadena TX 77505 · (281) 436-9991 · Mon–Fri 8am–5pm CT · Bilingual · 0% restocking · 6mo–3yr warranty.
Looking for used engines in Houston, TX? Ultra Auto Parts TX supplies low-mileage, road-tested, VIN-verified used gas engines for Chevy, Ford, Toyota, Honda, GMC, Dodge, Nissan, and Jeep vehicles across the Houston and Pasadena area. As a dedicated drivetrain specialist, we compression-test and inspect every engine, match it to your exact vehicle by VIN, and back it with a 6-month to 3-year warranty and 0% restocking fee. Free local delivery, bilingual English/Spanish service.