The Jeep Wrangler is an iconic off-road SUV that has been in production since 1986. Over the years, Jeep has offered several different transmission options in the Wrangler to meet the needs of different drivers and use cases.
The transmission is responsible for transferring engine power to the wheels and plays a crucial role in overall vehicle performance and capability.
Manual transmissions give drivers more control and are preferred by off-road enthusiasts, while automatic transmissions provide a smoother on-road driving experience. Understanding the different transmission options available by model year can help Wrangler shoppers pick the right drivetrain for their needs.
Jeep Wrangler YJ (1987-1995)
The first generation Jeep Wrangler, known as the YJ, was introduced in 1987 and featured two transmission options:
Manual Transmissions
– BA10/5 – 5-speed manual (1987-1989)
– AX5 – 5-speed manual (1987-1995)
– AX15 – 5-speed manual (1988-1999)
Automatic Transmissions
– TF999 – 3-speed automatic (1987-1990)
– TF904 – 3-speed automatic (1991-1995)
The manual transmissions offered lower gear ratios for improved off-road capability while the automatics provided an easier on-road driving experience. The AX5 and AX15 manuals were the most common options and were reliable, affordable transmissions.
Jeep Wrangler TJ (1997-2006)
The second generation Jeep Wrangler, the TJ, debuted in 1997 and came with the following transmission options:
Manual Transmissions
– AX5 – 5-speed (1997-1999)
– AX15 – 5-speed (1997-1999)
– NV3550 – 5-speed (2000-2004)
Automatic Transmissions
– 32RH – 3-speed (1997-2002)
– 42RLE – 4-speed (2003-2006)
The NV3550 was a heavy-duty, performance-oriented manual transmission. The 32RH automatic was lightweight while the 42RLE added an overdrive gear for improved fuel economy.
Jeep Wrangler JK (2007-2018)
The third generation Jeep Wrangler JK arrived in 2007 with these transmission choices:
Manual Transmissions
– NSG370 – 6-speed (2007-2018)
Automatic Transmissions
– 42RLE – 4-speed (2007-2011)
– W5A580 – 5-speed (2012-2018)
The NSG370 manual transmission was an updated, more refined unit compared to previous manuals. The 5-speed W5A580 automatic provided better efficiency and power delivery than the outgoing 4-speed.
Transmission Gear Ratios
| Transmission | 1st Gear | 2nd Gear | 3rd Gear | 4th Gear | 5th Gear | 6th Gear |
|---|---|---|---|---|---|---|
| NSG370 Manual | 4.46 | 2.61 | 1.72 | 1.25 | 1.00 | 0.84 |
| 42RLE Auto | 2.84 | 1.57 | 1.00 | 0.69 | N/A | N/A |
| W5A580 Auto | 4.17 | 2.34 | 1.52 | 1.14 | 0.85 | 0.69 |
Jeep Wrangler JL (2018-Present)
The current-generation Jeep Wrangler JL provides these transmission options:
Manual Transmission
– AX15 – 6-speed
Automatic Transmission
– 850RE – 8-speed
The AX15 manual transmission features lower crawler gears for better control when off-roading. The 850RE automatic delivers smooth, efficient power delivery on pavement.
Transmission Gear Ratios
| Transmission | 1st Gear | 2nd Gear | 3rd Gear | 4th Gear | 5th Gear | 6th Gear | 7th Gear | 8th Gear |
|---|---|---|---|---|---|---|---|---|
| AX15 Manual | 4.46 | 2.61 | 1.72 | 1.25 | 1.00 | 0.80 | N/A | N/A |
| 850RE Auto | 4.70 | 3.13 | 2.10 | 1.67 | 1.29 | 1.00 | 0.84 | 0.67 |
How to Choose the Right Transmission on a Jeep Wrangler
When selecting a transmission for your Jeep Wrangler, there are a few important factors to consider:
- Use Case: Will you primarily drive on pavement or go off-roading? Manual transmissions perform better off-road while automatics are ideal for street driving.
- Power Needs: Make sure the transmission is matched to your Wrangler’s engine size and power output.
- Added Features: Some automatic transmissions have options like manual shift modes for more driver control.
- Capability: Carefully compare gear ratios, torque ratings, crawl ratios and other specs when comparing transmission options.
- Cost: Manual transmissions are typically less expensive than automatics. Factor in long-term ownership costs as well.
Consulting with a trusted Jeep mechanic can help you narrow down the best transmission choice for your needs and budget. Test driving different options can also give you a feel for transmission performance.
Maintaining Your Jeep Wrangler Transmission
To maximize the lifespan and performance of your Jeep Wrangler’s transmission, be sure to follow these maintenance tips:
– Change transmission fluid and filter according to factory service schedule
– Inspect transmission case, pan, lines and mount for leaks
– Check fluid level regularly and top off if needed
– Consider installing transmission cooler if towing or off-roading frequently
– Use only approved transmission fluid – never mix fluids
– Listen and feel for any abnormal shifting or vibrations
– Service transmission immediately if any leaks or issues are detected
Following the factory maintenance schedule for fluid changes is crucial, as old fluid can impact shifting smoothness and lead to internal damage over time. Keeping up with transmission maintenance will help avoid costly repairs down the road.
Improving Your Jeep Wrangler’s Transmission
Beyond routine maintenance, some Wrangler owners choose to upgrade or customize their transmissions for added performance and durability. Here are a few popular options:
- Transmission Swap: Installing a different transmission, such as replacing an older 3-speed auto with a new 6-speed manual.
- Shift Kits: Kits that adjust shift points for crisper, more responsive shifting.
- Coolers: Adding external transmission coolers to reduce fluid temperatures during demanding driving.
- Fluid: Upgrading to high-performance synthetic transmission fluid for smoother shifting.
- Clutch kits: For manual transmissions, installing performance clutches and related parts.
- Reprogramming: Having an automatic transmission reprogrammed by a tuner to change shift maps.
When modifying your transmission, use reputable parts and a knowledgeable technician. Improperly installed components can negatively impact performance and durability.
The Future of Jeep Wrangler Transmissions
Looking ahead, we can expect to see continued evolution in Wrangler transmission technology:
More Gears
New automatics will likely go beyond 8-speeds as more gears boost efficiency.
Towing Improvements
Upgraded torque converters and gearing to expand towing capabilities.
Hybrid Powertrains
Introduction of electric motor assists and integration with transmissions.
Better Software
More advanced computer controls for smoother, smarter shifting.
Stronger Builds
Increasing use of high-strength alloys and designs to handle greater torque loads.
While staying true to its off-road roots, the Jeep Wrangler will push forward with modern transmissions that balance capability with efficiency and refinement. The gearbox continues to be a critical component in the Wrangler’s iconic go-anywhere character.
Conclusion
Whether you opt for the greater control of a manual or the convenience of an automatic, choosing the right transmission is key to maximizing your Jeep Wrangler’s performance. This guide provides an overview of the various transmission options available for each generation of the iconic off-roader. With proper maintenance and care, your Wrangler’s transmission will deliver miles of enjoyable driving on and off the pavement.
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