Jeep 850Re Transmission Problems

The 850RE transmission is an 8-speed automatic transmission built by Chrysler. It is used in various Chrysler, Dodge, Jeep, and RAM vehicles. The 850RE was introduced in 2013 and has been plagued with problems ever since.

Jeep 850Re Transmission Problems, poor shift quality, and unexpected downshift. In some cases, the transmission may even fail to engage or disengage properly. Chrysler has issued multiple service bulletins for the 850RE transmission, but the problem persists.

If you own a vehicle with an 850RE transmission, be sure to keep a close eye on it for any signs of trouble. there are a few things you can do to try and troubleshoot the issue. Jeep 850Re Transmission Problems

Jeep 850Re Transmission Problems

Possible Issues that may cause Jeep 850Re Transmission Problems

1. Seals that are leaking

If this occurs to you, climb underneath and check the transmission to determine where the leakage is coming from. The dealership later determined that there was a leaky bottom seal, which was repaired under warranty.

Seals that are leaking

Observed symptoms:

  • sluggish gear shifting
  • Oil leaks when keeping the gear to 2500
  • Check engine light
  • Faulty Transmission
  • Hard Downshifting

Remember that the 850Re automatic gearbox features a learning mechanism that stores both driving styles as well as throttle position as you drive. So, if you notice forceful downshifting while coming to a halt, it should improve with time also as the transmission control module adapts.

However, it should not seem forceful or harsh when it downshifts and comes to a halt, or when it rolls and pulls off promptly.

2. The transmission fluid level is low.

Low transmission fluid levels may cause inconsistent changing, no shifting whatsoever, delayed shifting, unusual grinding sounds, limp mode, and even the check engine light illuminating.

3. Torque Converter Fault

This may cause the Jeep gearbox to squeal, tremble, and even overheat.

4. Bands that are worn

It is possible to have delayed shifting, changing at high RPM, violent shifting, neither gear at all, and no reverse.

5. Module for Shifting

A defective shifter module with a shifter cable may cause its transmission to get jammed or to refuse to shift into the desired gear.

6. Valve Body Defect

The valve body is very complex and can fail in several ways. Depending on the competent that fails, it can cause limp mode. The transmission may not shift at all or harsh shifts between gears or specific gears.

7. Vehicle Speed Sensor Fault

The vehicle speed sensor could be the source of a hard shift or being trapped in emergency mode in your Jeep. The VSS sends a signal to both the Powertrain Central Controller, and the last signal may trigger any or all of the preceding systems.

8. Switch for Brake Lights

A broken brake light switch might keep the shifter from shifting out of or back into Park.

9. Battery Voltage Is Low

In rare circumstances, the low battery voltage may cause the automatic gearbox to enter limp mode.

10. PCM/TCU/ECU Software Problem

Inconsistent shifting or downshifting might be caused by software faults. Transmission gears may change too late or drop suddenly. This is a typical issue with your gearbox; a Jeep retailer could provide a software update to help remedy similar shifting issues.

11. Wiring harness

Shifting issues might be caused by wire harness damage from the ECU / PCM towards the gearbox case. You may, for example, simply shift entirely or move into gear.

The Most Common Jeep 850Re Transmission Issues

Based on our study and expertise with Jeep cars, below is a list of the most frequent Jeep gearbox issues and their likely causes with 850Re Transmission.

The Most Common Jeep 850Re Transmission Issues

1. Gear shifts that are delayed or fail

  • Worn or blocked governors pressure solenoid, preventing adequate fluid pressure from being maintained. This will impair transitions from first to third gear. Incorrect solenoid position readings will result from a malfunctioning sensor or a wiring problem.
  • The worn overdrive solenoid acts as a pressure accumulator, allowing the overdrive gear to activate. This will only affect the 4th (overdrive) gear. Whenever this solenoid burns out, it is unable to maintain the necessary transmission fluid pressure for optimal functioning.
  • Inadequate transmission fluid volumes or filthy transmission filters are two more probable reasons.

2. Overdrive or torque converter problems

  • Its pressure boost valve is held just on the bottom side of both the valve body by a fractured cover plate. This is a common issue that is the consequence of bad manufacturing design. As a consequence, the retaining bracket holding the lockup pump separates. This results in a P1740 code. The ideal option is to install a specific upgrading kit from Superior Solution.
  • Input/output speed sensors also on the gearbox are malfunctioning, as is the throttle position sensor. If any of these gives an inaccurate reading, its torque converter clutch will suffer. These problems frequently result in different speed sensor-related errors.
  • Defective regulator pressure solenoid or sensor, as previously mentioned. 

3. Gear engagement is delayed or fails.

  • The transmission cooler filter is loose or detached. When the car is shut off for an extended period of time, the transmission fluid drains from the torque converter, delaying gear engagement until the pressure rises up. The problem is resolved by installing an updated filter.
  • Transmission fluid as well as filter contamination, insufficient fluid level, or incorrect transmission fluid

4. Gear changes that are delayed or in limp-home mode

  • The defective conductor plate links the solenoids to the TCU. Whenever the conductor plate fails, communication issues arise, resulting in inappropriate solenoid functioning. This is a common issue with several aftermarket remedies.
  • Valve body solenoid that is worn or defective. Corrosion to the wire harness might sometimes cause an issue.

5. Erratic gear changes or sliding gears

  • Solenoids that engage each gear are leaking or sticking. This is a progressive process that begins only when chilly and worsens with time. The only remedy is to replace the entire solenoid set using new or updated solenoid sets.
  • Messages from the TCU are obstructed by faulty or broken solenoid wire. The problem may be resolved by inspecting and fixing or replacing the wiring.
Erratic gear changes or sliding gears

6. Intermittent neutral shifts

  • Incorrect sensor signals are produced by a defective transaxle range sensor connection and cabling. Whenever the TCU identifies an improbable signal, it switches to neutral and assigns the P0901 code. Since this is a well enough and significant safety hazard, it is covered by a Service Bulletin. Examine your car to see whether it is impacted.

How to Check the Level of Jeep 850Re Transmission Fluid

This approach is solely for checking low transmission fluid. If transmission fluid is low, add and check it. Checking a gearbox without fluid might harm it.

  • When feasible, park the car on flat ground.
  • Place the parking brakes as well as gearshift to the Park position.
  • Open the hood by pulling the hood release.
  • Track down the transmission dipstick.
  • Clean the dipstick with a clean towel after removing it.
  • Put the dipstick back into the gearbox. Remove the transmission when it has been completely installed.
  • Examine the dipstick carefully to ascertain the existing transmission fluid level. For the COLD (lower) indicators, the level should be somewhere between MIN and MAX.
  • Add transmission fluid if the level is low.
  • Drive the car for fifteen minutes, being sure to manually choose all gears.
  • Repeat the operation when the transmission has warmed up, however this time the level again for HOD (higher) indications must be somewhere between the minimum and maximum marks.

A gearbox dipstick is not standard on all Jeep cars. If somehow the dipstick is missing, the car must be placed on a hoist and the level verified through the fill hole.

Jeep 850Re Automatic Transmission Adaptation should be reset.

Adaptive automatic gearbox analyzes driving behavior and modifies gear shifts for optimal engine responsiveness and shift points.

Newer Jeeps may track your driving. Resetting the transmission adaption might make your Jeep shift normally. This easy technique improves shifting without side effects. This method works for W5A580 transmissions and perhaps others. It’s harmless and worth a go.

How to reset Jeep gearbox without tools:

  • Maintain a firm grip on the gas pedal.
  • Start the engine without turning on the ignition.
  • For thirty seconds, keep the vehicle ignition on (engine off) with the gas pedal down.
  • Turn off the ignition.
  • Let go of the gas pedal.

Start the car and drive carefully for 20 kilometers. If the foregoing process doesn’t enhance shift quality, use a scanner to reset the transmission adaptation.

850Re Transmission

The 850RE transmission is a high-performance, heavy-duty automatic transmission built by Chrysler. It is designed for use in rear-wheel drive vehicles with V8 engines. The 850RE features eight forward gears and one reverse gear.

It is equipped with an electronically controlled converter clutch and a lockup torque converter. The transmission is capable of handling up to 650 lb-ft of torque. The 850RE was introduced in 2012 as an upgrade to the previous 845RE transmission.

The main difference between the two transmissions is the addition of extra gear in the 850RE. This additional gear helps to improve fuel economy and provides better performance at higher speeds. If you are looking for a high-performance, heavy-duty automatic transmission for your rear-wheel drive vehicle, then the Chrysler 850RE is a great option to consider.

850re Transmission Fluid Change

A transmission fluid change for a Fiat 850re may be required every 20,000 miles. A person should check their transmission fluid level every 10,000 miles. If the dipstick reads low, add enough 8mt to bring it up to the proper operating level.

The 850 is a four-speed transmission with no overdrive; it was designed for economy and durability while still providing good performance and reliability. It is lightweight because of its aluminum case design and has an external oil filter instead of an internal one within the engine compartment

850re transmission gear ratio

Ratio First Second Third Fourth Final Drive 1st – 5.13; 2nd – 2.63; 3rd – 1.53. 0.86 0.63

The 850transmission had three different final drives depending on the year and model equipped with this transmission;

3.91 ratio available in models up to the l model year in the USA(1984), 3.91 ratios available in models up to the I model year in the USA(1985).

850re transmission filter

The transmission has a replaceable aluminum external oil filter that is located on the back of the transmission, front, and to the left. The filter is next to the emergency brake cable; it is held in place by a bracket. A person can change this filter with some difficulty and the proper tools.

850re transmission filter

Which Jeep Has Transmission Issues?

There have been several reports of transmission issues with Jeep vehicles over the years. The most common problems seem to be with the automatic transmissions, but there have also been some reports of issues with the manual transmissions as well. Here is a rundown of some of the most common Jeep transmission problems:

Jeep Grand Cherokee Transmission Problems: The Grand Cherokee has probably been the Jeep model with the most reported transmission problems. Some of the most common issues include jerky shifting, delayed engagement, and complete failure. These problems are often caused by faulty solenoids or sensors, but they can also be caused by a leaking seal or damaged clutch.

Jeep Wrangler Transmission Problems: There have also been a number of reports of transmission problems with the Wrangler model. Like the Grand Cherokee, these issues are often caused by faulty solenoids or sensors. However, they can also be caused by a problem with the transfer case shift fork or a damaged input shaft bearing.

Jeep Liberty Transmission Problems: Liberty has also had its share of transmission problems over the years. Common issues include hard shifting, delayed engagement, and complete failure. These problems are often caused by worn-out clutch discs or pressure plates, but they can also be caused by a problem with the electronic control module (ECM).

850Re Transmission Ram

The 850RE is an eight-speed automatic transmission for rear-wheel drive vehicles that were introduced in the 2013 Ram 1500. It is also used in the 2014 Jeep Grand Cherokee and the 2015 Chrysler 200. The main difference between the 850RE and other transmissions is its use of an electronically controlled clutch pack instead of a torque converter.

This change allows for a more fuel-efficient transmission as well as smoother shifting. In addition, the 850RE has been designed with a lower first-gear ratio to improve launch performance and towing ability.

850Re Transmission for Sale

If you’re in the market for a used car, you may be wondering if the 850RE transmission is worth considering. The 850RE is an 8-speed automatic transmission that was first introduced in 2013. It’s been used in a variety of vehicles, including the Jeep Grand Cherokee, Dodge Challenger, and Chrysler 300.

Here’s what you need to know about the 850RE transmission before making a purchase:

 The Pros: 

  1. The 850RE offers excellent fuel economy thanks to its 8-speed design.
  2. It’s a relatively new transmission, so it benefits from all of the latest technology and engineering advancements. 
  3. The 850RE is built to handle high torque loads, so it’s ideal for use in performance vehicles.
  4. It features a wide range of gears that helps make acceleration smoother and more efficient.

42Rle Transmission Problems

The following are the top six most common 42RLE transmission issues:

  1. Poor Shifting Issue
  2. Gear Locked in 2nd Stage or Limp Home Mode
  3. In addition to bad shifting, losing vehicle power as well as limp home mode are typical problems.
  4. Overdrive or the Check Engine Light is on.
  5. Transmission Overheating

Engine at high revs.


Jeep JL Transmission

The Jeep JL Transmission is a new 8-speed automatic transmission that was introduced in the 2018 Jeep Wrangler. The JL Transmission is a significant improvement over the previous 5-speed automatic transmission, and it offers a much smoother and more refined driving experience. The JL Transmission is also significantly more fuel efficient than the 5-speed, and it offers increased towing capacity.

Overall, the JL Transmission is a great upgrade for any Jeep Wrangler owner, and it’s sure to make your driving experience even better.

Jeep JL Transmission

Jeep JL Automatic Transmission Problems

If you own a Jeep YJ with an automatic transmission, then you may have experienced some transmission problems. Here are some common issues that can occur and what you can do to fix them. One of the most common Jeep YJ automatic transmission problems is when the transmission slips out of gear.

This can happen while you’re driving or when you’re trying to shift into a higher gear. If this happens, it’s usually because the transmission fluid is low. To fix this, simply add more fluid to the reservoir.

Another issue that can occur is hard shifting. This means that the gears are not shifting smoothly and it feels like the engine is revving up before each shift. This is usually caused by dirty or old transmission fluid.

To fix this, flush out the old fluid and replace it with new fluid according to your manufacturer’s recommendations. If your Jeep YJ seems to be lurching forward or backward when you come to a stop, then this could be an indication of a problem with your torque converter.

The torque converter is what allows the engine to idle smoothly when you come to a stop by converting the engine’s power into hydraulic pressure.

If there is an issue with your torque converter, it will need to be replaced by a professional mechanic. If your Jeep YJ is having trouble going into reverse, then this could be due to a faulty shift solenoid or low transmission fluid levels.

Jeep Tj Transmission Problems

If you own a Jeep TJ, it’s important to be aware of the potential transmission problems that can occur. The most common issue is with the input shaft bearing, which can fail and cause the transmission to grind or not engage properly. Other issues include leaking seals and faulty shifting forks.

If you’re experiencing any type of transmission problem in your Jeep TJ, it’s best to take it to a certified mechanic for diagnosis and repair. Trying to fix the problem yourself could make things worse, so it’s always best to leave it in the hands of a professional.


Is the 850Re Transmission Reliable?

The 850RE transmission is a reliable piece of equipment that can be used in a variety of applications. It is designed to work with both gas and diesel engines and can be paired with either an automatic or manual transmission.

The 850RE has a number of features that make it an ideal choice for many users, including its ability to handle high torque loads, its precision shifting, and its overall durability.

Who Makes the 850Re Transmission?

The 850RE transmission is made by Chrysler. This transmission is an 8-speed automatic that was first introduced in 2013 in the Jeep Grand Cherokee. The 850RE is also used in the Ram 1500 and 2500 trucks, as well as the Chrysler 300.

This transmission has been praised for its smooth shifting and fuel efficiency.

What is the Difference between 850Re And 8Hp75 Transmission?

The answer is: the difference between 850RE and 8HP75 transmissions is that the former has eight gears while the latter has six. The 850RE is also a bit longer and wider, making it better suited for larger vehicles. It should be noted that both of these transmissions are very similar; they just have different gear ratios.



If you own an 850RE transmission, you may have experienced one or more of the following Jeep 850Re Transmission Problems: hard shifting, slipping, delayed engagement, and fluid leaks. While these problems can be frustrating, there are some things you can do to help fix them. First, check your transmission fluid level and quality.

If it is low or dirty, replace it with fresh fluid. Next, make sure your transmission is properly cooled by checking the cooling system for leaks and making sure the radiator fins are clear of debris. Finally, if your transmission is still having issues, take it to a qualified mechanic or transmission specialist for further diagnosis and repair.