Remanufactured 4.0L Jeep Inline-Six Engine | Wrangler, Cherokee, Grand Cherokee | 4.7L Stroker | Fraser Engines

Fraser Engines · 4.0L Jeep Engine Program · 🔥 Blazing Hot Seller

Remanufactured 4.0L Jeep Inline-Six Engine Assembly

Q: What is the 4.0L / 4.7L Stroker option?

The Fraser Advantage Stroker uses the 4.0L block with a longer-stroke rotating assembly to reach 4.7L, delivering more low-end torque, with all TSB updates and a 5-year warranty plus 1 year of free No-Fault coverage.

Q: Does Fraser help verify 4.0L Jeep engine fitment?

Yes. Fraser matches the correct engine to your full 17-character VIN, head design and block casting before shipment.

Q: Is a No-Fault warranty upgrade available?

Yes. 1- to 5-year No-Fault protection from $99 to $499 can be added at checkout. Fraser Advantage options already include 1 year of No-Fault coverage free.

Three builds for the legendary 4.0L — a standard zero-mile remanufactured inline-six, the Fraser Advantage™ build with every T.S.B. update applied, or the Fraser Advantage™ 4.0L / 4.7L Stroker for owners who want more torque. All ship with free commercial shipping and no upfront core charge.

Option 1 · Standard Remanufactured

Remanufactured 4.0L Jeep Engine Assembly

Zero-mile remanufactured inline-six · 3-yr warranty

SKU: FEF40JS● In StockOnly 2 left

Your cost$2,399^.00No upfront core charge

🛡 3-Year / Unlimited-Mile parts & labor nationwide warranty
🚚 FREE shipping & core pickup to any commercial address in the continental U.S.
🔥 No upfront core charge

What’s included (10 items)

Remanufactured engine block
Remanufactured cylinder head
New pistons
New rings
New bearings
Balanced & tested rotating assembly
New timing components
New gaskets & seals
Oil pump

Place Order Online Call (800) 731-3177

Order with a Product Specialist Mon–Fri 8AM–5PM EST · Online 24/7

Option 2 · Fraser Advantage™

Fraser Advantage™ 4.0L Jeep Engine + ALL TSB Upgrades

Upgraded block & head · all T.S.B. updates · 5-yr warranty + 1-yr No-Fault

SKU: FEJ40R-HD● In StockOnly 3 left

Your cost$2,999^.00No upfront core charge

🛡 5-Year / Unlimited-Mile parts & labor warranty + 1 Year No-Fault FREE
🛠 All major OEM & aftermarket T.S.B. updates applied
🚚 FREE shipping & core pickup to any commercial address in the continental U.S.
🔥 No upfront core charge

What’s included (11 items)

Remanufactured & upgraded engine block
Remanufactured & updated cylinder head
New pistons
New rings
New bearings
Balanced & tested rotating assembly
New timing components
New gaskets & seals
Oil pump
All OEM & aftermarket TSB updates applied

Place Order Online Call (800) 731-3177

Order with a Product Specialist Mon–Fri 8AM–5PM EST · Online 24/7

Option 3 · Fraser Advantage™ · 4.0L / 4.7L Stroker

Fraser Advantage™ 4.0L / 4.7L STROKER Jeep Engine + ALL TSB Upgrades

Stroked to 4.7L for more low-end torque · all T.S.B. updates · 5-yr warranty + 1-yr No-Fault

SKU: FEJ4047STR-HD● In StockOnly 1 left

Your cost$4,599^.00No upfront core charge

🛡 5-Year / Unlimited-Mile parts & labor warranty + 1 Year No-Fault FREE
🛠 All major OEM & aftermarket T.S.B. updates applied
🚚 FREE shipping & core pickup to any commercial address in the continental U.S.
🔥 No upfront core charge

What’s included (11 items)

Remanufactured & upgraded engine block
Remanufactured & updated cylinder head
New pistons — 4.7L stroker configuration
New rings
New bearings
Balanced & tested rotating assembly
New timing components
New gaskets & seals
Oil pump
All OEM & aftermarket TSB updates applied

Place Order Online Call (800) 731-3177

Order with a Product Specialist Mon–Fri 8AM–5PM EST · Online 24/7

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Fraser Engines Protection Options

Protect your investment

Upgrade your coverage and add recommended installation products when placing your order. A Fraser Engines Product Specialist will confirm all selections before processing.

Optional Coverage — No-Fault Warranty Upgrades Available with purchase

1-YearNo-Fault Warranty

Entry-level No-Fault protection for the first year of ownership.

$99.00

2-YearNo-Fault Warranty

Extended No-Fault protection for two full years.

$199.00

3-YearNo-Fault Warranty

Three years of upgraded No-Fault protection.

$299.00

Premium Pay4-YearNo-Fault Warranty

Four-year No-Fault protection with Premium Pay benefits.

$399.00

Best Protection5-YearElite Maxx No-Fault Warranty

Maximum No-Fault protection with Premium Pay benefits.

$499.00

Recommended Products — Installation Add-Ons Available with purchase

Premium Installation Kit

Commonly recommended replacement components to support a professional engine installation. Contents and availability may vary by application.

$250.00

Premium Engine Break-In Oil

Specially formulated to protect critical engine components during the initial break-in period while supporting proper ring seating.

$49.99

Important: Warranty coverage, labor reimbursement, eligibility, limitations and claim requirements are governed by Fraser Engines’ written warranty terms and conditions.

Fraser Engines · 4.0L Jeep Engine Program

Remanufactured 4.0L Jeep engines built for long-term reliability

Premium replacement 4.0L inline-six solutions for Jeep Wrangler, Cherokee, Grand Cherokee, Comanche and related AMC/Jeep applications. The legendary 4.0L is known for durability and low-end torque — but high mileage, overheating, oiling concerns, cylinder head cracking and internal wear eventually lead to major failure.

Zero-Mileage Remanufactured BuildUpdated ComponentsDirect Replacement FitmentWarranty Coverage AvailableNationwide Shipping

Fraser remanufactured 4.0L Jeep inline-six engine

4.0L Inline-Six

Know the warning signs

Common 4.0L Jeep engine problems

The 4.0L powered many of Jeep’s most recognized vehicles and is respected for long service life — but age, mileage, overheating, cooling-system neglect, oil-pressure concerns, cylinder head cracking and internal wear can make replacement the most practical repair.

Cylinder head cracking

Certain 4.0L head castings are known to crack, allowing coolant loss, overheating or coolant contamination.

Overheating damage

Radiator restrictions, thermostat failure, water pump wear, fan problems or neglect damage the head, gasket and cylinder bores.

Rear main seal & gasket leaks

Oil leakage from the rear main, valve cover, oil pan and timing cover is common on aging 4.0Ls.

Oil pressure & bearing wear

High mileage, sludge, worn bearings or oil pump wear cause low pressure, knocking and bottom-end damage.

Piston skirt & cylinder wear

Internal wear produces cold-start noise, blow-by, oil consumption, low compression or misfires.

Timing set & valvetrain wear

Chain stretch, lifter wear, worn cam components or poor lubrication cause rattling, ticking and performance concerns.

The Fraser Advantage

A better alternative to another used 4.0L engine

A used 4.0L is risky — most donors are now older, high-mileage units with unknown cooling-system history, oil leaks, cylinder head concerns or internal wear. Fraser remanufactured 4.0L engines are a professionally renewed direct-replacement alternative with updated components and fitment support, so you repair your Jeep correctly the first time.

Zero-mileage remanufactured build instead of a questionable salvage engine
Updated internal components designed for long-term reliability
Professionally remanufactured block & cylinder head for dependable service life
Direct-replacement fitment support for Jeep & AMC 4.0L applications
Powertrain-focused specialists — engines and transmissions every day
VIN-based quote support to identify the correct 4.0L for your vehicle
Commercial repair-facility shipping to streamline unloading and installation
Core return assistance — Fraser coordinates pickup after installation

Premium Remanufacturing ProcessBetter Value Than UsedWarranty Options AvailableCommercial Shop Shipping Support

Fraser technician building a remanufactured engine

Trusted Since 1961

Diagnose First

Repair or replace?

Signs you may need a 4.0L Jeep engine replacement

Some 4.0L issues can be repaired externally — but severe overheating, internal noise, low compression, a cracked cylinder head, excessive oil consumption or oil-pressure failure make a replacement engine the better long-term repair.

Knocking, ticking, rattling or internal engine noise
Overheating damage or repeated coolant loss
Low compression or failed cylinder leak-down testing
Persistent misfires after ignition and fuel repairs
Timing-chain rattle, valvetrain ticking or cam/crank correlation concerns
Oil pressure warnings or metal contamination in the oil
Coolant loss or contamination, suspected cylinder head or head-gasket failure
Engine replacement recommended by a licensed repair facility

Know the difference

Used 4.0L Jeep engine vs. Fraser remanufactured 4.0L

A used 4.0L may come from a decades-old donor with unknown mileage, previous overheating, poor maintenance, oiling damage, cylinder head cracking or excessive internal wear. Even if it runs today, hidden problems may already be developing. Instead of gambling, you receive a professionally renewed replacement backed by Fraser’s support.

Feature	Used Salvage Engine	Low-Cost Rebuild	Fraser Remanufactured
Internal mileage	Prior service mileage; unknown	Varies	Zero miles since remanufacture
Factory updates (TSBs)	None	Rarely	All applicable OEM & aftermarket updates applied
Cylinder head condition	Unknown — cracking risk	Often reused	Remanufactured head, pressure tested; updated on Fraser Advantage™
Internal components	Existing wear	Reuses marginal parts	New pistons, rings, bearings, timing, oil pump, gaskets & seals
Machine work	None	Minimal	Precision-machined block; heads pressure-tested & resurfaced
Fitment verification	Varies	Varies	VIN-based verification before shipment
Warranty	Varies / none	Short-term	3-Yr (Standard) or 5-Yr + 1-Yr No-Fault (Fraser Advantage™)
Core return	Varies	Varies	Free commercial pickup · Fraser support

4.0L Jeep fitment matters

Vehicle applications & VIN / casting-based fitment

Jeep 4.0L fitment varies by VIN, model year, cylinder head design, block casting, crankshaft position sensor setup, emissions package, accessory configuration, transmission pairing and platform. Fraser recommends VIN verification before purchase to ensure the correct replacement engine is quoted for your Jeep.

Jeep Wrangler 4.0LJeep Cherokee 4.0LJeep Grand Cherokee 4.0LJeep Comanche 4.0LAMC / Jeep inline-sixAutomatic & manual configurations

Make	Model	Engine	Notes
Jeep	Wrangler YJ / TJ	4.0L Inline-6	Confirm head casting & sensor setup by VIN
Jeep	Cherokee XJ	4.0L Inline-6	Confirm model year & emissions package by VIN
Jeep	Grand Cherokee ZJ / WJ	4.0L Inline-6	Confirm block casting & accessories by VIN
Jeep	Comanche MJ	4.0L Inline-6	Pickup platform sharing XJ drivetrain
AMC / Jeep	Other inline-six applications	4.0L Inline-6	Contact us with your VIN for matching

VIN- and casting-specific matching: have your full 17-character VIN ready so our team can match the exact 4.0L (or 4.7L stroker) replacement engine for your Jeep.

True remanufacturing — not a budget rebuild

How your Fraser 4.0L is built

Every Fraser 4.0L is torn down to the bare block and rebuilt in a controlled, multi-step process. Fraser Advantage™ builds add every OEM and aftermarket T.S.B. update — and the 4.7L Stroker option adds a longer-stroke rotating assembly for noticeably more low-end torque on the trail.

01Complete teardown to the bare block and industrial cleaning.

02Precision-machined block built to OEM or tighter tolerances.

03Remanufactured cylinder head — crack inspected, pressure tested, resurfaced.

04New pistons, rings & bearings installed to factory-clearance specs (4.7L pistons on the Stroker).

05New timing components to improve durability.

06New oil pump for proper lubrication and oil pressure.

07New gaskets & seals throughout — including rear main — to prevent leaks.

08Balanced & tested rotating assembly and final quality inspection.

❌ Used 4.0L engines

Decades-old donors with unknown overheating history and cracked-head risk.

❌ Cheap rebuilds

Reuse marginal parts and skip the updates — the same failure comes back.

✅ Fraser remanufactured

Fully remanufactured, VIN-verified fitment, and up to a 5-year warranty with free No-Fault on Fraser Advantage™.

Industry-leading warranty coverage

Real protection, not fine print

Fraser handles warranty claims directly with engine specialists — not call-center reps. Labor is reimbursed using Mitchell or ALLDATA book time.

Option 1 · Standard Remanufactured3 Years / Unlimited Miles

Parts & labor nationwide warranty · No-Fault upgrades available at checkout

Fraser Advantage™ · Options 2 & 3Included5 Years / Unlimited Miles

Parts & labor nationwide PLUS 1 year of FREE No-Fault coverage — rarely matched in the remanufactured engine market

Optional No-Fault upgrades from 1 to 5 years are available on every option — see Protection Options. Coverage, labor reimbursement, eligibility, exclusions and claim procedures are governed by Fraser Engines’ written warranty agreement.

Answers before you order

4.0L Jeep engine replacement FAQs

Is a remanufactured 4.0L Jeep engine better than a used engine?

Yes, for most owners. Used 4.0L donors are older, high-mileage units with unknown cooling history, oil leaks and cylinder head concerns. A Fraser remanufactured 4.0L is a zero-mile build with a remanufactured head, new pistons, rings, bearings, timing components, oil pump, gaskets and seals, VIN-verified fitment and a 3- or 5-year unlimited-mile warranty.

What are common 4.0L Jeep engine problems?

Cylinder head cracking, overheating damage, rear main seal and gasket leaks, oil pressure and bearing wear, piston skirt and cylinder wear, and timing set and valvetrain wear.

What is the 4.0L / 4.7L Stroker option?

The Fraser Advantage™ Stroker ($4,599) starts with the 4.0L block and uses a longer-stroke rotating assembly to reach 4.7L of displacement — delivering noticeably more low-end torque for trail use and larger tires — while keeping all TSB updates and the 5-year warranty with 1 year of free No-Fault coverage.

Does Fraser help verify 4.0L Jeep engine fitment?

Yes. Fitment varies by VIN, model year, head design, block casting, crank sensor setup, emissions package, accessories and transmission. Our team matches the correct engine to your full 17-character VIN before shipment.

Can Fraser ship my 4.0L Jeep engine to my repair shop?

Yes. Shipping and core pickup are free to any commercial address in the continental United States.

Is a No-Fault warranty upgrade available?

Yes. 1- to 5-year No-Fault protection ($99–$499) can be added at checkout. Fraser Advantage™ options 2 and 3 already include 1 year of No-Fault coverage free.

Ready to replace your 4.0L Jeep engine?

Three builds from $2,399 — including the 4.7L Stroker

Talk to a trained Fraser powertrain specialist today. We’ll verify fitment, explain warranty options, review core return details and provide a clear quote for your Jeep 4.0L replacement engine.

800-731-3177

Place Order Online Request My 4.0L Jeep Quote Check Fitment

Press 1 for Sales · Mon–Fri 8AM–5PM EST · Online ordering open 24/7 · sales@fraserengines.com

From$2,399.00

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