NV247 Quadra-Trac II
Problems & Repair Cost

The New Venture NV247 is the Quadra-Trac II transfer case used in the 1999 through 2004 Jeep Grand Cherokee WJ. It is a chain-driven case with a 2.72:1 low range and three positions on the lever: 4 All Time, Neutral, and 4 Lo. There is no 2WD.

What makes the NV247 different from a simple part-time case is how it sends power to the front axle. Under normal driving the rear axle does almost all the work. Inside the case is a gerotor pump driven by the difference in speed between the front and rear outputs. When the rear tires start to spin faster than the fronts, the pump builds pressure and squeezes a clutch pack (the progressive coupling), which ties the front output to the rear. When the speeds match again, pressure drops and the clutch lets go.

That is clever, and on a healthy WJ it is invisible. It also means the case depends on three things working correctly: the right fluid, a healthy pump, and tires that turn at the same speed.

The Most Common NV247 Problems

1. No front engagement

The classic failure. The Jeep gets stuck with one rear tire spinning and nothing happening up front. The usual cause is pump wear. The gerotor and the pump housing wear with age, pressure drops, and the clutch pack never clamps hard enough to engage. Low or degraded fluid makes it worse. In 4 Lo the case is mechanically locked, so a WJ that pulls fine in 4 Lo but not in 4 All Time almost always has a pump or coupling problem, not a chain problem.

2. Binding, chatter, or a shudder in turns

This almost always comes back to fluid. The NV247 needs a specific friction-modified transfer case fluid from Mopar. Fill it with ATF or a generic transfer case fluid and the clutch pack can grab and release in tight turns, which feels like a shudder or a hop in parking lots. Fixing it usually means draining and refilling with the correct fluid, sometimes twice to flush the old stuff out.

3. Mismatched tires

Because the pump responds to speed difference, a tire size or wear mismatch between front and rear keeps the coupling working all the time. It heats the fluid, wears the clutches, and can feel like binding. One new tire on a worn set, or a mismatched spare, is enough. Keep all four tires the same brand, size, and close in tread depth, and rotate them.

4. Chain stretch

WJs are old enough now that the chain has a lot of miles on it. Symptoms are a clunk when you shift from Drive to Reverse, slop on throttle changes, and a rattle from the case. A slapping chain will eventually groove the aluminum housing. The HV-071 NV247 chain is the replacement. See chain stretch symptoms for the full checklist.

5. Leaks at the outputs and seams

The rear output seal and the front output seal both leak with age, and the case halves seep at the seam. A leaking NV247 is worse than a leaking part-time case because low fluid directly reduces pump pressure and front engagement. Fix leaks early. Our output shaft seal guide covers costs.

6. Shift linkage and 4 Lo problems

A lever that will not go into 4 Lo, or pops back out, is usually the linkage under the Jeep or a worn bushing, not the case. Shift into 4 Lo with the transmission in Neutral and the vehicle barely rolling, as the owner manual says. Forcing it while stopped in gear grinds the range teeth.

How to Diagnose an NV247

• Check the fluid level and condition first. Pull the fill plug on a level surface. Fluid should be at the bottom of the hole. Dark, burnt-smelling fluid means it is overdue and the clutches have been working hard.
• Confirm the fluid type. If you do not know what is in it, assume it is wrong and refill with the correct Mopar transfer case fluid.
• Compare tires. Measure tread depth and check the sidewall sizes on all four.
• Test on a loose surface. In 4 All Time on gravel or wet grass, accelerate hard from a stop. You should feel the front pull almost immediately. If the rears spin and the fronts do nothing, the pump or coupling is weak.
• Test in 4 Lo. If the front pulls in 4 Lo but not 4 All Time, the chain and front driveline are fine. The problem is the pump and coupling.
• Listen on a lift. Clunks and rattles from the case at idle in gear point to chain. Growl that rises with road speed points to bearings. Our noise guide helps separate the case from the transmission.

NV247 Repair Costs

If the case is coming apart for a pump, do the chain and seals at the same time. The labor is the expensive part, and the chain in a 20-year-old WJ is rarely in great shape. If the housing is grooved from a slapping chain, a good used case may make more sense than a rebuild.

A WJ with a weak NV247 is also often running a tired 45RFE or 42RE. If the transmission is part of the problem, read our Grand Cherokee transmission slipping guide before you spend money on the case.

FAQ

What Jeep uses the NV247 transfer case?

The NV247 Quadra-Trac II was used in the 1999 through 2004 Jeep Grand Cherokee WJ. It has 4 All Time, Neutral, and 4 Lo positions with a 2.72:1 low range.

Why will my Grand Cherokee not engage the front wheels?

In a WJ with the NV247, the most common cause is a worn gerotor pump or low, old, or wrong fluid. If the front pulls in 4 Lo but not 4 All Time, the pump and coupling are the problem.

What fluid does the NV247 use?

It requires Mopar's specific NV247 transfer case fluid, which is friction modified for the clutch pack. ATF or generic transfer case fluid can cause chatter, binding, or poor engagement.

Can mismatched tires damage an NV247?

Yes. The coupling engages based on speed difference between axles, so mismatched tire sizes or tread depths keep it working constantly, overheating the fluid and wearing the clutches.

How much does it cost to fix an NV247?

A fluid service runs $100 to $180 at a shop. A chain replacement is typically $600 to $1,000, and a remanufactured case installed is around $1,300 to $2,000.