The 1999 Jeep Grand Cherokee transmission is known for giving clear warning signs before a major failure occurs. If you own this SUV, understanding these signals can save you thousands of dollars and keep you off the side of the road. This guide walks you through everything you need to know about the 1999 Jeep Grand Cherokee transmission, from common problems to repair options and maintenance tips.
Let’s get straight to the point. The 42RE and 44RE automatic transmissions were the main units used in these models. They are generally reliable, but age and mileage bring specific issues. You need to know what to look for.
1999 Jeep Grand Cherokee Transmission Overview
The 1999 model year used two main transmissions. The 42RE was paired with the 4.0L inline-six engine. The 44RE was used behind the 5.2L V8. Both are four-speed automatic overdrive units made by Chrysler.
These transmissions are hydraulic with electronic controls. They are known for their durability when properly maintained. But neglect leads to problems fast.
Common Symptoms Of A Failing Transmission
You might notice a few things before a complete breakdown. Pay attention to these signs.
- Delayed engagement when shifting from Park to Drive or Reverse
- Harsh or erratic shifting between gears
- Slipping under acceleration, where the engine revs but the vehicle does not speed up
- Whining, clunking, or grinding noises coming from the transmission area
- Burning smell from the transmission fluid overheating
- Fluid leaks, usually red or brown puddles under the vehicle
If you experience any of these, do not ignore them. The 1999 Jeep Grand Cherokee transmission gives you warnings. Listen to them.
Why The 42RE And 44RE Transmissions Fail
Several factors cause these units to fail. Age is a big one. The rubber seals and gaskets harden and crack over time. This leads to internal fluid leaks and pressure loss.
Another common issue is the torque converter. The lock-up clutch can fail, causing shuddering or stalling. The valve body also wears out, leading to incorrect shift patterns.
Overheating is a major killer. If the transmission gets too hot, the fluid breaks down. This reduces lubrication and causes internal wear. Towing heavy loads or driving in stop-and-go traffic makes this worse.
Transmission Cooler Line Problems
The cooler lines that run from the transmission to the radiator are a weak point. They can rust or crack, especially in areas with road salt. A leak here drops fluid level fast, leading to catastrophic failure.
Check these lines regularly. Replace them if you see any corrosion or wet spots. It is a cheap fix compared to a full rebuild.
How To Diagnose Transmission Issues
You can do some basic checks at home. Start with the fluid level and condition.
- Park the vehicle on a level surface. The engine should be running and at operating temperature.
- Pull out the transmission dipstick. Wipe it clean with a lint-free rag.
- Reinsert the dipstick fully, then pull it out again.
- Check the fluid level. It should be in the “Hot” or “Full” crosshatch area.
- Look at the fluid color. Healthy fluid is bright red and clear. Dark brown or black fluid means it is burnt.
- Smell the fluid. A burnt odor indicates overheating or internal wear.
If the fluid is low, add the correct type. For the 1999 Jeep Grand Cherokee transmission, use Mopar ATF+4 or a compatible equivalent. Do not mix fluids.
Scan For Trouble Codes
Modern transmissions have electronic controls. A check engine light can point to transmission issues. Use an OBD-II scanner to read the codes.
Common transmission codes for this model include:
- P0700: Transmission Control System Malfunction
- P0731: Gear 1 Incorrect Ratio
- P0732: Gear 2 Incorrect Ratio
- P0733: Gear 3 Incorrect Ratio
- P0734: Gear 4 Incorrect Ratio
- P0740: Torque Converter Clutch Circuit Malfunction
These codes help narrow down the problem. But they do not always tell the full story. A professional diagnosis is often needed.
Repair Options For The 1999 Jeep Grand Cherokee Transmission
You have several choices when the transmission fails. The right one depends on your budget and how long you plan to keep the vehicle.
Option 1: Fluid And Filter Change
If the transmission is slipping but the fluid is not burnt, a simple service might help. Drop the pan, replace the filter, and refill with fresh fluid.
This works best for minor issues caused by old or low fluid. It will not fix mechanical damage. But it is a good starting point.
Option 2: Valve Body Repair Or Replacement
Many shift problems come from the valve body. This is the brain of the transmission. It can be removed and rebuilt or replaced with a remanufactured unit.
This is a common fix for harsh shifting or delayed engagement. It costs less than a full rebuild but requires some mechanical skill.
Option 3: Full Rebuild
A complete rebuild involves disassembling the transmission, replacing all worn parts, and reassembling it. This is the most thorough repair.
Expect to pay between $1,500 and $3,000 for a professional rebuild. The price varies by shop and location. A rebuild can extend the life of your Jeep for many years.
Option 4: Remanufactured Transmission
You can buy a remanufactured transmission from a supplier. These are rebuilt to factory specifications and come with a warranty.
Costs range from $1,200 to $2,500 for the unit itself. Installation adds several hundred dollars. This is a good option if you want a reliable replacement without the downtime of a rebuild.
Option 5: Used Transmission From A Junkyard
A used transmission from a salvage yard is the cheapest option. Prices can be as low as $300 to $800. But this is a gamble. You do not know the history of the unit.
Only go this route if you are on a tight budget and can install it yourself. Even then, expect potential problems down the road.
Step-By-Step Guide To Changing Transmission Fluid
Changing the fluid and filter is a basic maintenance task. It can prevent many problems. Here is how to do it safely.
- Gather supplies: New transmission filter, gasket, ATF+4 fluid, drain pan, jack stands, and basic hand tools.
- Jack up the vehicle securely on level ground. Use jack stands. Do not rely on the jack alone.
- Place the drain pan under the transmission pan. Remove the pan bolts carefully. The pan holds about 4 to 5 quarts of fluid.
- Lower the pan slowly. Fluid will spill out. Be careful not to get it on your skin or clothes.
- Remove the old filter. It is usually held by a few bolts or a clip.
- Clean the pan thoroughly. Remove all old gasket material and metal shavings.
- Install the new filter. Make sure it seats properly.
- Place the new gasket on the pan. Reinstall the pan and tighten the bolts to the correct torque (around 10-12 ft-lbs).
- Lower the vehicle. Find the transmission dipstick tube. Use a funnel to add new fluid. Start with about 4 quarts.
- Start the engine. Let it idle. Shift through all gears slowly. Check the fluid level and add more as needed.
- Take the vehicle for a short drive. Recheck the fluid level when warm. Top off if necessary.
This process only replaces about half the fluid. The rest stays in the torque converter. For a full flush, you need special equipment. Many shops offer this service.
Preventive Maintenance Tips
Keeping your transmission healthy is easier than fixing a broken one. Follow these tips.
- Check the fluid level every month. Low fluid is the most common cause of failure.
- Change the fluid and filter every 30,000 to 50,000 miles. More often if you tow or drive in harsh conditions.
- Use only ATF+4 fluid. Other fluids can cause damage.
- Install an external transmission cooler if you tow heavy loads. This keeps temperatures down.
- Avoid aggressive driving. Hard acceleration and sudden stops stress the transmission.
- Fix leaks immediately. A small leak can become a big problem fast.
What To Do If The Transmission Overheats
If you notice a burning smell or the transmission feels sluggish, stop driving. Pull over safely and let the engine idle in Park. This allows the fluid to circulate and cool down.
Check the fluid level. If it is low, add some. If it is burnt, you need a fluid change. Do not drive long distances with an overheating transmission. It will cause permanent damage.
Frequently Asked Questions
What type of transmission fluid does a 1999 Jeep Grand Cherokee use?
It uses Mopar ATF+4 or a compatible equivalent. Do not use Dexron or Mercon fluids. They can cause shifting problems and damage seals.
How much does it cost to replace a 1999 Jeep Grand Cherokee transmission?
The cost varies. A used transmission can be $300 to $800. A remanufactured unit is $1,200 to $2,500. A professional rebuild runs $1,500 to $3,000. Labor adds $500 to $1,000.
Can I drive my Jeep with a slipping transmission?
It is not recommended. Driving with a slipping transmission causes more damage. The friction material wears off and clogs the valve body. This leads to a complete failure. Get it checked as soon as possible.
How long does a 1999 Jeep Grand Cherokee transmission last?
With proper maintenance, these transmissions can last 150,000 to 200,000 miles. Neglect shortens that significantly. Regular fluid changes are the key to longevity.
What are the signs of a bad torque converter in a 1999 Jeep Grand Cherokee?
Common signs include shuddering at highway speeds, stalling when coming to a stop, and a whining noise from the transmission area. The torque converter clutch can also fail, causing a loss of overdrive.
Final Thoughts On The 1999 Jeep Grand Cherokee Transmission
The 1999 Jeep Grand Cherokee transmission is a robust unit when cared for properly. It gives clear warning signs before failure. Pay attention to them. Regular maintenance is the best way to avoid costly repairs.
If you are experiencing issues, diagnose them early. A simple fluid change or valve body repair can save you from a full rebuild. And if you need a new transmission, weigh your options carefully. A remanufactured unit with a warranty is often the best balance of cost and reliability.
Your Jeep has been reliable for years. With a little attention, the transmission can keep it on the road for many more. Dont wait until it is too late. Check the fluid today.