QU10038 Genuine NVG NV4500 1-2 Synchronizer Hub


QU10038 Genuine NVG NV4500 1-2 Synchronizer Hub without Shift Interlock is a genuine New Venture Gear (NVG) new takeout 1-2 shift hub taken from brand new NV4500 transmissions we disassembled for parts. QU10038 fits 1992-2005 Dodge and 1995-2007 GM New Venture NV4500 5 speed manual transmissions. USA made.  Matching synchronizer slider is QU10081.  NOTE: The shift Interlock feature was usually not used on transmissions with 5.61:1 1st gear ratio.

Also see QK1058 1-2 Synchro Assembly without Shift Interlock for all NV4500 EXCEPT 1992-1994 GM
For 1992-1994 GM NV4500, see: QU10215 1-2 Synchro Assembly with Shift Interlock

Genuine NVG 1-2 Synchronizer Hub
* Kits made up of multiple items may not show an inventory in-stock status but are almost always in stock!

tech note

Dan the Gear Man® Tech Note 1:
QU10038 is a component part of QK1058. QK1058 and QU10215 1-2 Synchronizer Assemblies for New Venture NV4500 5 speed manual transmissions are physically interchangeable. The interlock feature, which was used on 1992-1994 GM transmissions with 6.34: 1st gear ratio, was designed to prevent high speed down shifting in 1st and 2nd gear. To accomplish this, four sliding blocks and two springs are added to the synchro hub. When the mainshaft is rotating at high speeds, centrifugal force pushes the blocks against the sliding clutch ring and locks it in place. The early synchro hubs were slotted for the four blocks, plus there was four holes in it for the spring hooks. Once the interlock feature was abandoned after 1994/1995, the synchro hub was redesigned to eliminate the hub slots and holes. If you have the early QU10215 Synchronizer with interlock, you can convert it to a non-interlock unit simply by removing the four flyweight blocks and two c-shaped springs. The sliding hub plus the synchro springs and rectangular struts are the same for all years and models.

tech note

Dan the Gear Man® Tech Note 2:
To make a complete 1-2 synchronizer assembly, order QU10081 Sleeve + QU10038 Hub + QK1100 Synchro Strut Kit. I also recommend you get QT2008 1-2 Synchro Support which will simplify assembly. 1-2 Synchro assembly procedures are covered in my TM1003 NV4500 Shop Manual or V1003DVD NV4500 Overhaul Video.

tech note

Dan the Gear Man® Tech Note 3:
All New Venture NV4500 transmissions use three synchronizer rings for 1st gear and for 2nd gear. The inner and outer rings are made of steel, while the center ring is faced with carbon fiber on both sides. 

tech note

Dan the Gear Man® Tech Note 4:
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

Dan the Gear Man® Tech Note 5:
Matching Popular Mainshaft Part Numbers for QU10038 1st-2nd Synchro Hub are:

Application Mainshaft Engine Output Spline
1992-1993 Dodge 4x4
1994-2005 Dodge NV4500LD
QU10214 Gas V8 23
1994-2004 Dodge 4x4 NV4500HD  QA1045
Diesel or V10 29
1995-2004 Dodge 4x2 NV4500HD QU10013 Diesel or V10 31
1992-2007 GM 4x4 QU10098 All 32
1997-2007 GM C-Series 4x2 QU10719 All 35
tech note

Dan the Gear Man® Tech Note 6:
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

Dan the Gear Man® Tech Note 7:
Other Matching Parts for QU10038 1st-2nd Synchro Hub:
QU10081 1-2 Synchro Sleeve
QK1100 Synchro Strut Kit
QU10002 Synchronizer Ring, Center Friction
QU10014 Synchronizer Ring, Inner Steel
QU10015 Synchronizer Ring, Outer Steel
QK1103 Snap Ring Kit, 1-2 Synchro
QU10052 1-2 Shift Fork
Mainshafts: See Tech Note 5


Chevy and GMC:
1995-1999 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