The 2007 Jeep Wrangler manual transmission features a six-speed gearbox designed for both highway cruising and off-road torque. This transmission is a key part of the Wrangler’s legendary capability, giving you direct control over power delivery. If you own or are considering a 2007 model, understanding this gearbox is essential for maintenance and performance.
The NSG370 six-speed manual was standard on most 2007 Wranglers, replacing older five-speed units. It offers a good balance of low-end grunt for trails and overdrive for highway driving. Let’s break down everything you need to know about this transmission.
2007 Jeep Wrangler Manual Transmission
The NSG370 is a robust unit, but it has quirks. It was built by Mercedes-Benz and used in several vehicles. In the 2007 Wrangler, it mates to either the 3.8L V6 engine or the 2.8L diesel (outside North America). The clutch feel is light, but the shifter can feel notchy when cold.
Here are the key specs for the 2007 Jeep Wrangler manual transmission:
- Type: Six-speed manual, rear-wheel drive with part-time four-wheel drive
- Gear Ratios: 1st (4.23), 2nd (2.53), 3rd (1.67), 4th (1.23), 5th (1.00), 6th (0.79)
- Reverse: 3.52
- Fluid Capacity: Approximately 2.4 quarts (2.3 liters)
- Recommended Fluid: Mopar ATF+4 automatic transmission fluid (yes, it uses ATF, not gear oil)
Common Issues With The NSG370
Every transmission has weak points. The 2007 Jeep Wrangler manual transmission is no different. Here are the most common problems owners report:
- Notchy Shifting When Cold: The NSG370 uses a specific fluid. Using the wrong fluid makes shifting stiff. Stick to ATF+4.
- Clutch Pedal Squeak: The clutch pivot ball and throwout bearing can squeak. Lubricating the pivot point helps.
- Gear Grinding Into Reverse: This is common. The transmission lacks a synchro for reverse. Shift into first gear first, then reverse to align the gears.
- Leaking From The Shift Tower: The rubber boot on the shift tower can crack, letting fluid leak. Replace the boot if you see fluid around the shifter base.
- Hard To Get Into First Gear: If it’s hard to engage first from a stop, check your clutch adjustment. The hydraulic system may need bleeding.
Fluid Change Procedure For The 2007 Wrangler Manual
Changing the fluid is straightforward. You should do it every 30,000 to 50,000 miles for best performance. Here is a step-by-step guide:
- Park on level ground. Jack up the vehicle and support it on jack stands.
- Locate the transmission drain plug on the bottom of the case. It uses a 17mm hex head.
- Place a drain pan under the plug. Remove the plug and let the fluid drain completely.
- Clean the drain plug. Reinstall it and tighten to 25 ft-lbs.
- Locate the fill plug on the side of the transmission. It is also a 17mm hex head.
- Remove the fill plug. Use a fluid pump to add ATF+4 until fluid starts to drip out of the fill hole.
- Replace the fill plug and tighten to 25 ft-lbs. Lower the vehicle.
- Start the engine and cycle through all gears. Check for leaks.
Important: Do not overfill. Overfilling can cause foaming and poor shifting. The fill plug is the level check.
Upgrading The 2007 Jeep Wrangler Manual Transmission
If you off-road hard or tow, you might want upgrades. The stock clutch is fine for daily driving but can slip under heavy load. Consider these upgrades:
- Heavy-Duty Clutch Kit: A South Bend or Centerforce clutch handles more torque. Expect a firmer pedal feel.
- Short Throw Shifter: Reduces shift throw by about 30%. Makes shifts quicker but can be notchy.
- B&M Precision Shifter: A popular upgrade that reduces slop. It uses a different shift mechanism.
- Fluid Upgrade: Some owners use Red Line MTL or Amsoil Syncromesh for smoother shifts. Check compatibility with ATF+4 first.
Off-Road Driving With The Manual Transmission
The 2007 Jeep Wrangler manual transmission shines off-road. The low first gear ratio gives excellent crawling control. Here are tips for off-road use:
- Use 4-Low for steep climbs and descents. The gearing multiplies torque.
- Left-foot braking helps maintain momentum. Keep the engine revs up while braking with your left foot.
- Avoid riding the clutch on steep hills. Use the handbrake to hold the vehicle while you engage first gear.
- Shift early on loose surfaces. Keeping revs low prevents wheel spin.
- Practice clutch control on flat ground before attempting obstacles.
Comparing The 2007 Manual To Automatic
The 2007 Wrangler also came with a four-speed automatic. Here is how they compare:
| Feature | Manual (NSG370) | Automatic (42RLE) |
|---|---|---|
| Fuel Economy | Better highway (up to 20 mpg) | Lower (around 16-18 mpg) |
| Off-Road Control | More control, engine braking | Easier on rocks, less driver input |
| Maintenance | Simpler, cheaper fluid changes | More complex, filter changes needed |
| Cost | Usually cheaper used | Often more expensive |
| Fun Factor | More engaging | Less engaging |
Your choice depends on driving style. The manual is better for purists and off-road enthusiasts. The automatic is easier for daily commuting.
Identifying Your 2007 Wrangler Manual Transmission
Not all 2007 Wranglers have the same transmission. Here is how to identify yours:
- Check the VIN. The 8th digit indicates engine, but transmission is not in VIN. Look at the build sheet.
- Look under the vehicle. The NSG370 has a ribbed aluminum case. The drain plug is on the bottom, fill plug on the side.
- Count the bolts on the bellhousing. The NSG370 has 10 bolts.
- Check the shifter. The NSG370 has a straight shift pattern with reverse to the right and down.
Maintenance Schedule For The 2007 Manual Transmission
Regular maintenance keeps your 2007 Jeep Wrangler manual transmission running smoothly. Follow this schedule:
- Every 30,000 miles: Change transmission fluid. Use ATF+4.
- Every 60,000 miles: Inspect clutch slave cylinder and master cylinder for leaks.
- Every 100,000 miles: Replace clutch kit, throwout bearing, and pilot bearing.
- Annually: Check shift boot for cracks. Lubricate shift linkage.
Common Myths About The 2007 Manual Transmission
There are many myths about this transmission. Let’s clear them up:
- Myth: You can use gear oil. No. The NSG370 requires ATF+4. Gear oil is too thick and causes shifting issues.
- Myth: The transmission is weak. It is actually strong for its size. It handles up to 300 lb-ft of torque stock.
- Myth: You need to double-clutch. Only if the synchros are worn. Normal driving does not require double-clutching.
- Myth: The shifter can be adjusted. The shifter is fixed. You cannot adjust it. Only replace it.
Rebuilding The 2007 Jeep Wrangler Manual Transmission
If your transmission fails, rebuilding is an option. Here is what is involved:
- Remove the transmission from the vehicle. This requires removing the skid plate, driveshafts, and transfer case.
- Disassemble the case. Remove the shift forks, synchros, and gears.
- Inspect all parts. Replace worn synchros, bearings, and seals.
- Reassemble with new gaskets and seals. Use a rebuild kit from a reputable brand.
- Install the transmission. Refill with ATF+4.
Rebuilding costs around $800 to $1,500 in parts and labor. A used transmission costs $500 to $1,000. Consider your budget.
Aftermarket Parts For The 2007 Manual Transmission
Several aftermarket parts improve performance and durability:
- Clutch: Centerforce, South Bend, or Luk. Luk is OEM quality.
- Flywheel: Dual-mass flywheel is stock. Single-mass flywheels reduce weight but can cause vibration.
- Shifter: B&M, Hurst, or Savvy. Savvy offers a cable shifter for better feel.
- Fluid: Amsoil Syncromesh, Red Line MTL, or Mopar ATF+4.
- Boot: Crown Automotive sells replacement shift boots.
Driving Tips For The 2007 Wrangler Manual
Here are tips to get the most out of your manual transmission:
- Shift at 2,500 to 3,000 rpm for normal driving. This keeps the engine in the power band.
- Use engine braking on descents. Downshift to third or second gear to save brakes.
- Do not rest your hand on the shifter. This wears the shift forks.
- Bleed the clutch system if the pedal feels spongy. Air in the system causes poor engagement.
- Warm up the transmission in cold weather. Drive gently for the first few miles.
Frequently Asked Questions
What fluid does a 2007 Jeep Wrangler manual transmission use?
It uses Mopar ATF+4 automatic transmission fluid. Do not use gear oil. The capacity is about 2.4 quarts.
Is the 2007 Jeep Wrangler manual transmission reliable?
Yes, it is generally reliable. Common issues include notchy shifting when cold and clutch squeaks. Regular fluid changes help.
Can I swap a 2007 manual transmission into an older Wrangler?
Yes, but it requires adapters. The NSG370 bellhousing pattern is different from older transmissions. You need a conversion kit.
How much does it cost to replace the clutch on a 2007 Wrangler manual?
Parts cost $200 to $500 for a clutch kit. Labor adds $400 to $800. Total is around $600 to $1,300.
Does the 2007 Wrangler manual have a synchro for reverse?
No, it does not. That is why it sometimes grinds. Shift into first gear first to align the gears, then shift to reverse.
Final Thoughts On The 2007 Jeep Wrangler Manual Transmission
The 2007 Jeep Wrangler manual transmission is a solid choice for off-road and daily driving. It gives you control and engagement that an automatic cannot match. With proper maintenance, it will last for many years.
Remember to use the correct fluid, check for leaks, and address any shifting issues early. If you take care of it, the NSG370 will serve you well on and off the trail.
Whether you are crawling rocks or cruising highways, this transmission is a key part of the Wrangler experience. Enjoy the drive.