Skip to content
Gearbox NSG-370 6 speed Jeep JK Wrangler

Gearbox NSG-370 6 speed Jeep JK Wrangler

by Jeep City

Save $300.00 Save $300.00
$2,500.00
$2,500.00 - $2,500.00
$2,500.00
$2,200.00
$2,200.00 - $2,200.00
$2,200.00

NSG-370 6-Speed Manual Gearbox – Jeep JK Wrangler (2007–2011) | Preowned

The NSG-370 is the 6-speed manual transmission Jeep fitted to the JK Wrangler from 2007 through to 2011, and it's one of the better manual gearboxes to come out of that era. Manufactured by Mercedes-Benz for Chrysler, it's a robust, well-engineered unit that Jeep enthusiasts genuinely prefer over the automatic for off-road driving — particularly for its engine braking capability and direct feel on the trail.

This is a preowned unit removed from a running vehicle, with less than 100,000km on the clock. These gearboxes are becoming increasingly difficult to source in good condition as the JK fleet ages, so if you're rebuilding a manual JK or need a replacement, this is a solid opportunity.

Compatible Models

  • Jeep Wrangler JK (2007–2011) — manual transmission variants only

Common Failure Symptoms

The NSG-370 is generally reliable, but common issues that prompt replacement include difficulty selecting gears (particularly 1st and reverse), grinding or crunching during gear changes, oil leaks from the input or output shaft seals, and excessive noise in neutral. In some cases, worn synchros or a damaged shift fork will make the gearbox unserviceable without a full rebuild — at which point a quality used replacement is often the more cost-effective path.

Benefits of Replacing

A direct swap with a known low-kilometre unit gets your JK back on the road faster and more affordably than a full rebuild. It also gives you a clean starting point — no worn synchros, no mystery history, no guesswork.

Workshop Fitting Tips

  • This is a significant drivetrain job. A transmission jack and a two-post hoist are essential.
  • Always replace the clutch, pressure plate, and release bearing at the same time — it's a false economy not to while the gearbox is out.
  • Inspect the flywheel for heat cracks or scoring before refitting.
  • Replace the input shaft seal and rear output seal as a matter of course.
  • Refill with the correct NSG-370 specified fluid — do not substitute with generic gear oil.
  • A driveline alignment check is recommended after installation.

Related Components to Inspect

Clutch assembly, flywheel, transfer case input bearing, gear shifter bushings, and transmission mount.

Customer FAQs

Q: Will this gearbox fit my 2012 or later JK Wrangler?
A: This unit is suited to JK Wranglers from 2007–2011. Jeep made changes to the JK drivetrain from 2012 onwards — contact us before ordering if you have a later model to confirm compatibility.

Q: What condition is this gearbox in?
A: This is a preowned unit with less than 100,000km on the clock. It was in working order when removed from the donor vehicle. As with all used drivetrain components, we recommend having it inspected by a qualified mechanic before installation.

Q: Should I replace the clutch at the same time?
A: Absolutely — it's strongly recommended. With the gearbox out, replacing the clutch, pressure plate, and release bearing adds minimal labour cost and avoids having to pull everything apart again in the near future.