QU10075 NV4500 39 Tooth Mainshaft 1st Gear

QU10075 NV4500 39 Tooth Mainshaft 1st Gear  fits all 1992-2007 New Venture NV4500 transmission models. This big, rugged gear rarely needs replacement. When it does, the problem is usually caused by running the wrong or contaminated oil which will result in synchro clutch tooth wear and/or bearing failure. Imported.

Need More Info? Use the handy Links below to access over 40 years of Dan's product and vehicle specific Tech Notes to easily get the information you need for your vehicle's repair, maintenance, or upgrade project!

Dan the Gear Man® Tech Notes:
Mainshaft Specs
Common 1st Gear Failures
NV4500 Tools
Matching Countershafts
Matching Mainshafts
Matching Synchronizer Parts
Matching Parts
Applications

Tech Note 1: Mainshaft Specs
QU10075 is a 39 tooth, bearing supported mainshaft 1st gear that is compatible with ALL New Venture NV4500 5 speed manual transmissions regardless of 1st gear reduction ratio. All NV4500 countershafts have 12 1st gear teeth so QU10075 works in both medium ratio NV4500 transmissions with 5.61:1 1st gear ratio AND wide ratio 1992-1994 GM NV4500 models with the 6.34:1 1st gear ratio.

Tech Note 2: Common 1st Gear Failures
1st Gear failures in New Venture NV4500 5 speed manual transmissions are usually a lubrication related failure that damages the bearing bore. Another failure is synchronizer clutch tooth wear and or synchro cone wear caused by incorrect lubricant or the use of cheap imported bronze synchro rings instead of OE style lined steel rings. Problems with your clutch not fully releasing or crankshaft pilot bearing/bushing dragging can also lead to clutch teeth wear from "grinding" the gears during shifting.

NV4500 mainshaft 1st Gear tooth breakage is usually limited to mega-horsepower competition vehicles.  There are claims that cryogenically treating NV4500 gears will increase gear strength as much as 30%. Unfortunately, there does not seem to be any peer-reviewed documentary evidence to support those claims. Cryogenically treating gears is primarily a cold-hardening process that changes the molecular structure of steel to decrease wear while retaining or increasing hardness. If properly done, it is probable the cryogenic treatment process does slightly increase the impact and fatigue resistance of NV4500 gears, but not enough to significantly increase the ability of an NV4500 transmission to reliably handle more than 600 Lb.-Ft. of input torque especially considering the maximum factory torque rating of the  NV4500HD transmission is only 460 Lb.-Ft..

Tech Note 3: NV4500 Tools
Need Torque Specs or Rebuild procedures? Order my 116 page, full color illustrated TM1003 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.

Tech Note 4: Matching Countershafts
Matching Countershaft Part Numbers for QU10075 1st Gear are:

Tech Note 5: Matching Mainshafts
Matching Popular Mainshaft Part Numbers for QU10075 1st Gear are:

Tech Note 6: Matching Synchronizer Parts
NV4500 Transmissions have 3 1st Gear Synchronizer Rings. Matching Synchronizer Parts for QU10075 Gear are:

 *QU10215 1-2 Synchronizer Assembly with Shift Interlock can be replaced by QK1058 if desired. The Shift Interlock was intended to prevent down-shifting at high speeds.

**QU10002 is the Center Friction Ring. QU10014 is the Inner Steel Ring. QU10015 is the Outer Steel Ring.

Tech Note 7: Matching Parts
Other Matching Parts for QU10075 1st Gear:
QU10055 Bearing, 1st Gear
QU10002 Synchronizer Ring, Center Friction
QU10014 Synchronizer Ring, Inner Steel
QU10015 Synchronizer Ring, Outer Steel
QU10001 Premium Bearing and Seal Kit 1992-1996 Dodge
QU10005 Premium Bearing and Seal Kit 1997-2005 Dodge
QU10061 Premium Bearing and Seal Kit 1992-1995 GM 4x4
QU10062 Premium Bearing and Seal Kit 1996-2005 GM 4x4
QU10063 Premium Bearing and Seal Kit 1992-1995 GM 4x2
QU10064 Premium Bearing and Seal Kit 1996-2007 GM 4x2
QU90020 NV4500 Manual Transmission Oil
TM1003 NV4500 Shop Manual
V1003DVD NV4500 Overhaul Video

Applications

Chevy and GMC:
C1500, K1500, C2500, K2500, C3500, C3500HD, K3500 with NV4500 5 Speed: 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999
C2500, K2500, C3500, K3500 Standard and HD Pickup based models with NV4500 5 Speed: 2000, 2001, 2002, 2003, 2004, 2005, 2006
C3500HD 15,000 Lb. GCVW Cab and Chassis with NV4500 5 Speed: 2000, 2001, 2002
C2500, K2500 Silverado Classic and Sierra Classic with NV4500 5 Speed: 2007

Dodge and Ram:
D250, W250, D350, W350 with Cummins Diesel AND our NV4500 Transmission Retrofit Kit: 1989, 1990, 1991, 1992, 1993
Ramcharger, D150, W150 with NV4500 5 Speed: 1992, 1993
D250, W250, D350, W350 with Gas Engine and NV4500 5 Speed: 1992, 1993
Ram 2500, Ram 3500 with V10 and NV4500HD 5 Speed: 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003
Ram 2500, Ram 3500 with Cummins Diesel and NV4500HD 5 Speed: 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004
Ram 2500, Ram 3500 with gas V8 and NV4500LD 5 Speed: 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005