Fraser Engines proudly offers fully remanufactured 4.0L inline-six engines for Jeep applications spanning the 1987–2006 model years. Known for durability, torque, and trail-proven reliability, the Jeep 4.0L is an iconic engine—and we’ve engineered our version to be even better than the original.

Each 4.0L engine is rebuilt to OEM or better specifications and backed by a 5-Year Unlimited Mileage Warranty, giving Jeep owners the confidence to tackle road, trail, or worksite with peace of mind and power that lasts.

✅ Vehicle Applications for Our 4.0L Reman Jeep Engines

Fraser’s remanufactured 4.0L inline-6 engines are designed to fit a wide range of legendary Jeep models:

• 1987–2001 Jeep Cherokee XJ

• 1993–1998 Jeep Grand Cherokee ZJ

• 1999–2004 Jeep Grand Cherokee WJ

• 1991–2006 Jeep Wrangler TJ / YJ

• 1987–1990 Jeep Comanche MJ

• 1993–2006 Jeep Wrangler SE / Sport / Rubicon (4.0L models)

If your Jeep came with a 4.0L straight-six, Fraser has the exact-fit solution built to last.

🔧 What Makes Fraser’s 4.0L Remanufactured Engines Better?

1. OEM+ Remanufacturing Process

Every engine is:

• Fully disassembled and cleaned

• Magnafluxed to check for cracks and casting flaws

• Precision-machined and rebuilt with all-new wear components

• Assembled with tight tolerances and zero-mile performance

2. Common Jeep 4.0L Issues Corrected

The 4.0L is a great engine, but we’ve seen it all—and we fix it all during the rebuild:

• Cylinder head cracking (notorious on 2000–2001 TUPY heads)

• Cam bearing wear

• Main seal oil leaks

• Piston slap and skirt wear

• Oil pressure problems

All known factory flaws are proactively corrected.

3. Premium Components Used in Every Build

• All-new pistons, rings, rod and main bearings

• Updated camshaft and lifters

• Fully remanufactured cylinder heads (pressure-tested)

• New timing set and oil pump

• Decked block, honed cylinders, balanced rotating assembly

• OEM-quality gasket set included

4. Optional Upgrades Available

Want more from your 4.0L Jeep engine? Ask about:

• HD/Fleet-spec builds

• Drop-in ready options with pans, valve covers, sensors

• Expedited production & shipping

• Core waivers (limited availability)

🛡️ Industry-Leading Warranty
Every remanufactured 4.0L Jeep engine comes with Fraser’s 5-Year / Unlimited Mileage Warranty. You’ll get full coverage on major internal components and access to our expert U.S.-based tech team when you need support.

📦 What’s Included in Your 4.0L Long Block Package?

• Fully assembled long block (block, crankshaft, pistons, heads, valvetrain, timing)

• Premium gasket set for installation

• Break-in and warranty registration instructions

• Crating + prepaid core return shipping label

• Additional components available upon request

🚚 Fast Shipping & Easy Core Returns

In-stock 4.0L engines typically ship within 2–3 business days. We simplify the core return process with pre-labeled shipping instructions and no-hassle logistics.

💳 Financing Available

Get your Jeep running now and pay over time. Qualified buyers enjoy flexible payment options starting around $95/month through our trusted financing partners.

🔍 Why Choose Fraser Engines for Your 4.0L Jeep Engine?

• 100% U.S.-Based Remanufacturing Facility

• 5-Year / Unlimited Mileage Warranty

• Over 8,500 Reviews with a 4.7+ Star Rating

• All Major OEM Weak Points Addressed

• Drop-In Ready and Fleet Options Available

• Decades of Jeep Engine Experience

• Fast Nationwide Delivery