QU10002 NV4500 1st and 2nd Gear Center Synchro Ring


QU10002 NV4500 1st or 2nd Gear Center Synchronizer Rings are high quality, original equipment style, carbon fiber lined synchronizer rings for all 1992-2007 GM and 1992-2005 Dodge New Venture NV4500 5 speed manual transmissions. On the NV4500, 1st and 2nd gears use a triple cone synchronizer setup. Each gear will have 1 each of QU10002 Center Friction Ring, QU10014 Inner Steel Ring, and QU10015 Outer Steel Ring. The QU10002 center ring is the friction ring. It will be sandwiched between the other two rings when you assemble your transmission. You need one of these rings for 1st gear and one for second gear. Size wise, these are the largest friction rings in a NV4500 transmission. Made in Switzerland.

1st or 2nd Center Synchro Ring
* Kits made up of multiple items may not show an inventory in-stock status but are almost always in stock!

tech note

Typically, NV4500 transmissions with stock type synchronizer rings are easy to shift, with a smooth positive feel. This is largely due to the advanced carbon fiber coatings on the rings and the use of compatible lubricants like Castrol Syntorq LT® or QU90020 NV4500 Manual Transmission 75w85w GL-4 synthetic gear lubricants. If you are experiencing shift difficulties with your NV4500, the most likely causes are: wrong or dirty lubricant, clutch issues, excessive mainshaft bearing end-play, or aftermarket brass synchro rings were installed when the transmission was rebuilt. Sometimes, changing the oil will help, but typically, by the time you get around to fixing the problem, the damage is already done.

tech note

The New Venture NV4500 5 speed transmission uses a triple cone synchronizer design for 1st and 2nd gears. It is advisable, but not required you replace QU10014 Inner Steel Rings and QU10015 Outer Steel Rings at the same time you replace QU10002 Center Friction Rings. To reuse QU10014 and QU10015 Rings, the condition of the friction surfaces on those rings must be good. If the polished steel finish is pitted, scored, or heat discolored (bluish color), you should replace them.

tech note

Soak your synchronizer rings in QU90020 75w85w GL-4 Synthetic Manual Transmission Fluid for New Venture NV4500 transmissions. For more information on rebuilding your NV4500 transmission, order my 116 page, full color illustrated NV4500 Rebuild Manual.

tech note

Need Torque Specs or Rebuild procedures? Order my 116 page, full color illustrated NV4500 Rebuild Manual.

You will need some special tools to correctly service your NV4500 Transmission. The chart below lists our current NV4500 Special Tools for popular models.


Component 23 Spline
Dodge 4x4
29 Spline
Dodge 4x4
30 Spline
Dodge 4x2
31 Spline
Dodge 4x2
32 Spline
GM 4x4
35 Spline
GM 4x2
Mainshaft Nut QT2002 QT2001
QT2002 QT2001
1-1/2" Hex
Mainshaft Holding NLA QT2000 NLA QT2011 N/A N/A
5th Gear Nut
Torx® Cross Bolt
N/A QT9205 N/A QT9205 N/A N/A
Output Seal Installer N/A QT1801 N/A QT2058
Not Used Not Used
Tailshaft Bushing Remover and Installer Not Used Not Used Not Used QT2044 Not Used Not Used


Front Bearing Cup Installer
QT1802 Use with QT1101 or QT1119 Driver Handle. Also can use flat side to install Dodge 4x4 Rear Output Seal
Countershaft Front Bearing Installer QT2004 Can also use to press 3-4 Synchro Hub on original equipment mainshafts
Input Bearing & Countershaft Rear Bearing Installer QT2005 Can also use to install Input Seal
Input Bearing Cup Installer QT1801 Use with QT1100, QT1101, QT1116, or QT1119 Driver Handle.
Countershaft Support QT2006 Use to support front of countersahft when installing countershaft rear bearing
1-2 Synchronizer Support QT2008 Use to support 1-2 synchronizer hub during synchronizer assembly
10mm 1/2" Drive 12 Point Socket QT1020 USA Made Impact Socket for Factory Tailshaft Housing Bolts
Long Shank Punch for Shift Lug QT9300 3/16" x 8" Shank for 5th Gear Shift Lug Roll Pin
tech note

Lubricants, Sealants, Threadlockers:
Early production NV4500 Transmissions used an anaerobic sealant (QU90003) to seal between the main case and input bearing retainer, top cover, and rear housing. Mid-production units used anaerobic sealant just on the input retainer and RTV for everything else. Later production transmissions used black RTV Sealant (QU90006 or QU90005) for everything. Either type of sealant works fine (except the PTO covers ALWAYS should be sealed with RTV), but I prefer RTV for all components. Regardless of which sealant you use, make sure excess sealant does not block the lube access hole at the top of input retainer pilot that fits into the transmission case. Also, the threaded holes in the main case for the four retainer bolts and 12 PTO bolts are open ended, so you must use new bolts with factory applied threadlocker or apply Threadlocker (S24200) to your existing bolts to prevent oil seepage past the bolt threads. See my TM1003 NV4500 Shop Manual or V1003DVD NV4500 Overhaul Video for more information.

Lubricant and Chemical List for NV4500 Transmissions
QU90020 NV4500 Manual Transmission Oil
QU90003 Anaerobic Sealant
QU90006 3.35 oz Ultra Black RTV Sealant
QU90005 0.5 oz Ultra Black RTV Sealant
S24200 6ml Threadlocker
S9978 1 gram Threadlocker
QU90003 Anaerobic Sealant
QU90006 3.35 oz Ultra Black RTV Sealant
QU90005 0.5 oz Ultra Black RTV Sealant
S24200 6ml Medium Strength Blue Threadlocker
S9978 1 gram Medium Strength Blue Threadlocker
S9979 1 gram High Strength Red Threadlocker
S24026 High Temperature Threadlocker for Mainshaft Nut

tech note

Other Matching Parts for QU10002 1st-2nd Synchronizer Ring:
QU10038 1-2 Synchro Hub
QU10081 1-2 Synchro Slider
QK1100 Synchro Strut Kit
QU10014 Synchronizer Ring, Inner Steel
QU10015 Synchronizer Ring, Outer Steel
QK1103 Snap Ring Kit, 1-2 Synchro
QU10075 39 Tooth Mainshaft 1st Gear
QU10035 37 Tooth Mainshaft 2nd Gear
QU90020 NV4500 Manual Transmission Oil
TM1003 NV4500 Shop Manual
V1003DVD NV4500 Overhaul Video


Chevy and GMC:
1992-1999 C1500, K1500, C2500, K2500, C3500, C3500HD, K3500 with NV4500 5 Speed
2000-2006 C2500, K2500, C3500, K3500 Standard and HD Pickup based models with NV4500 5 Speed
2000-2002 C3500HD 15,000 Lb. GCVW Cab and Chassis with NV4500 5 Speed
2007 C2500, K2500 Silverado Classic and Sierra Classic with NV4500 5 Speed

Dodge and Ram:
1989-1993 D250, W250, D350, W350 with Cummins Diesel AND our NV4500 Transmission Retrofit Kit
1992-1993 Ramcharger, D150, W150 with NV4500 5 Speed
1992-1993 D250, W250, D350, W350 with Gas Engine and NV4500 5 Speed
1994-2003 Ram 2500, Ram 3500 with V10 and NV4500HD 5 Speed
1997-2004 Ram 2500, Ram 3500 with Cummins Diesel and NV4500HD 5 Speed
1997-2005 Ram 2500, Ram 3500 with gas V8 and NV4500LD 5 Speed