Jeep NSG370 Transmission for Sale | New Venture Gear NSG370 is a 6-speed manual transmission with aluminum case

About the Jeep NSG370 Transmission

Is that a Jeep Wrangler JK rusting in your garage? A broken transmission, perhaps? Take a look at this Jeep NSG370 transmission for sale here. A reliable and capable 6-speed manual gearbox, this transmission will operate smoothly while cruising the highway or going on off-road adventures , a classic Jeep manual transmission setup. It has gained a reputation among enthusiasts for its 6-speed flexibility (including highway overdrive 6th gear), marking its place as a popular choice. This Jeep NSG370 transmission for sale here will be a great buy for your Wrangler JK service, manual conversion, or custom project that requires a reliable 6-speed transmission.

What is the Jeep NSG370 Transmission?

The NSG370 was designed by New Venture Gear in partnership with Mercedes / Daimler and entered Jeep production in 2005. Important note about its predecessor: In Wrangler applications, the NSG370 was designed as a successor to the NV3550 5-speed manual (which had itself replaced the AX-15 in 2000). The full Wrangler manual transmission progression is:

The NSG370 is NOT a direct successor to the AX-15 (the NV3550 was). The NSG370 is the successor to the NV3550, with key improvements:

• 6 forward gears (vs 5 in NV3550) for highway overdrive
• Aluminum case (vs cast iron in NV3550) for weight savings
• Dual mass flywheel for vibration damping
• More refined shifting with improved synchronizers

NSG370 Designation Explained

• "NSG": Stands for "New Series Gear" or "New Standard Gear" (sources vary on the exact meaning)
• "370": Indicates the approximately 370 N-m (273 lb-ft) torque capacity rating

So "NSG370" essentially means "the New Series Gear transmission with 370 N-m torque capacity."

Vehicle Applications

The NSG370 was used in:

The Mercedes-Daimler Connection

The NSG370 design has roots in a Mercedes-Benz Sprinter van transmission that NVG and Mercedes / Daimler jointly developed during the DaimlerChrysler era. This shared heritage is why the NSG370 uses metric Mercedes-style fluid specifications (API GL-3) rather than the typical 75W-90 used in older American manual transmissions.

Key Engineering Features of the NSG370

• 6-Speed Manual with Overdrive 6th: Typical gear ratios 1st (4.46:1), 2nd (2.61:1), 3rd (1.72:1), 4th (1.25:1), 5th (1.00:1 direct), 6th (0.84:1 overdrive), Reverse (4.06:1)
• Cast Aluminum Case: Lighter than NV3550's cast iron case, adequate strength for application
• Dual Mass Flywheel (DMF): Reduces vibration transmission and smooths shifts
• Fully Synchronized Forward Gears: 6 synchronizers for smooth shifting throughout the gear range
• Internal Shift Linkage: Direct top-mounted shifter
• Specific GL-3 Fluid Required: Different from older Jeep manuals (do not use GL-4 or GL-5 fluids)
• 273 lb-ft Torque Capacity: Adequate for 3.8 V6, 3.6 Pentastar, 3.7 PowerTech, and 4.0L inline-6

Common NSG370 Service Items (Honest Disclosure)

Honest disclosure of known service items:

• Dual Mass Flywheel (DMF) Failure: Most common high-mileage service item (100,000-150,000 miles). Symptoms: clutch chatter, vibration, eventually shudder during engagement. Replacement is expensive ($800-1,200 for the DMF alone, plus clutch service).
• Shifter Notchiness: Some users report the NSG370 feels "notchy" compared to older AX-15 or NV3550 transmissions. This is partly design characteristic and partly synchronizer wear at higher mileage.
• 5th and 6th Gear Synchronizer Wear: At high mileage (150,000+ miles), 5th and 6th gear synchronizers can wear, causing grind on shifts.
• Clutch System Hydraulic Issues: The hydraulic clutch master and slave cylinders are common service items.
• Fluid Type Issues: Using wrong fluid (e.g., 75W-90 GL-4) can damage NSG370 synchronizers and brass internals. Must use API GL-3 manual transmission fluid.
• Input Shaft Bearing Noise: Some high-mileage NSG370s develop input shaft bearing noise.

The NSG370 is generally durable when maintained per Jeep specifications with proper fluid. Service interval: fluid every 30,000-50,000 miles.

Why Choose a Used Jeep NSG370 Transmission?

• Cost savings vs reman ($1,499 used vs $2,000-$3,500 reman plus core)
• Direct OEM fit for Wrangler JK 2007-2018, Wrangler TJ final year 2005-2006, Liberty KJ 2005-2007
• 6 forward gears , better highway efficiency than older 5-speed manuals
• Aluminum case , lighter than NV3550 cast iron
• Strong aftermarket support , parts widely available
• Dual mass flywheel , smoother operation when in good condition

Here at Vaz Auto Solutions, you'll find this Jeep NSG370 transmission for sale at the most reasonable price possible, with all 6 forward gears tested, reverse confirmed, dual mass flywheel condition assessed (critical service item), and donor vehicle documented.

Vehicle Compatibility

Direct Fit:

Engine Pairings:

Condition and Inspection

• Donor vehicle confirmed (Wrangler JK, Wrangler TJ final year, Liberty KJ, or Grand Cherokee WK)
• Engine pairing confirmed (3.8 V6, 3.6 Pentastar, 4.0 inline-6, or 3.7 PowerTech V6)
• Bell housing pattern verified for engine pairing
• All 6 forward gears tested
• Reverse gear tested
• All 6 forward gear synchronizers assessed (1st through 6th)
• 5th and 6th gear synchronizer condition checked (common high-mileage wear point)
• Dual mass flywheel (DMF) condition assessed , critical service item
• Shifter mechanism function verified
• Bell housing condition inspected
• Aluminum case inspected for cracks
• Output shaft condition checked
• Input shaft condition verified (bearing noise check)
• Input shaft seal condition assessed
• Output shaft seal condition assessed
• Miles from donor vehicle documented where available
• All 6 gears + reverse tested on every NSG370
• All 6 synchronizers assessed (especially 5th and 6th gear , common wear points)
• Dual mass flywheel condition assessed , the most expensive NSG370 service item
• Input shaft bearing noise check (known high-mileage issue)
• Engine matching verified (3.8 V6, 3.6 Pentastar, 4.0 I6, 3.7 PowerTech)
• Donor vehicle and mileage documented
• Cross-reference assistance for Wrangler JK, TJ final year, Liberty KJ applications
• Free freight pallet delivery to all 50 states
• 15 day replacement warranty on internal defects
• Jeep NSG370 / NV3550 / AX-15 specialist support team (full Wrangler manual progression expertise)