Overview
The Jeep 68102506AA is a fifth and sixth gear synchronizer assembly for the NSG370 manual transmission. It is a direct-fit replacement for the 2005–2012 Jeep Liberty (KJ), the 2007–2017 Jeep Wrangler (JK) and the 2005–2006 Jeep Wrangler Unlimited (LJ). A synchronizer helps match gear speeds so the shifter engages smoothly.
Use it when the fifth and sixth gear synchronizer needs replacement inside an NSG370 gearbox. Trim-level fitment is covered in the Vehicle fitment section below.
Key features
- Designed for the NSG370 manual transmission fifth and sixth gear positions
- Factory replacement part, as stated by Jeep
- Direct fit for the vehicles covered here.
- Part number 68102506AA with UPC 700007590421 for easy cross-checking
Gear engagement and synchro wear
The synchronizer assembly brings the gear speed to a match before the dog teeth engage, which is why fifth and sixth shifts feel smooth when it is healthy. When the synchro rings or hub wear, the driver may notice grinding, a shift that resists, or a gear that jumps out at speed. These symptoms can also come from worn gears or forks, so the whole gearset deserves a look.
Because the NSG370 needs the gearbox opened for this work, replacing other worn parts at the same time is common practice. Clean the shaft and check the splines for wear, and make sure the assembly slides onto the gear hub without binding. A technician with NSG370 experience can check the rest of the gearset while it is accessible.
Specifications
| Brand | Jeep |
|---|---|
| Part number | 68102506AA |
| UPC | 700007590421 |
| Transmission | NSG370 manual |
| Position | Fifth and sixth gear synchronizer assembly |
| Fitment type | Direct fit |
Vehicle fitment
It fits the 2005–2012 Jeep Liberty (KJ), including Sport, Limited and Renegade trims; the 2007–2017 Jeep Wrangler (JK), including Sport, Sahara, Rubicon and Unlimited variants; and the 2005–2006 Jeep Wrangler Unlimited (LJ) in Unlimited and Unlimited Rubicon trims.
Wrangler TJ and YJ models and Liberty years after 2012 are not covered. Match your year, model and trim to the covered years before buying.
Installation notes
Replacing a synchronizer assembly means opening the transmission, so a technician familiar with NSG370 gearboxes is the safer choice for this part.
What’s included
It includes one fifth and sixth synchronizer assembly for part number 68102506AA.