QU10154 38 Tooth NV4500 Countershaft Front Gear for 1992-1995.5

QU10154 1992-1995.5 38 Tooth NV4500 Countershaft Front Gear is the big driven gear on the front of your early production Countershaft. QU10154 fits 1992-1995.5 5.61 ratio, New Venture NV4500 5 Speed Manual Transmissions with modular countershafts in 1992-95 Dodge and 1995 GM trucks. Your matching Main Drive Gear (Input Shaft) must have 22 teeth. QU10154 is driven by the input shaft, but it is also called the Countershaft Drive Gear or Countershaft 4th gear. Imported.

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Dan the Gear Man® Tech Notes:
Gear Specs
Input Shafts
Common Failures
NV4500 Tools
Matching Parts
Applications

Tech Note 1: Gear Specs
QU10154 is a 38 tooth, keyed, press-fit gear that fits QU10090 Countershaft. The transmissions that use this gear will be early production NV4500 transmissions with 5.61:1 1st and reverse gear ratios. The matching input shaft MUST have 22 teeth. QU10154 Gear and QU10090 Countershaft can be replaced by QU10078 Countershaft assembly. QU10154 is NOT compatible with 1992-1994 20 tooth input, GM NV4500 transmissions with 6.34:1 low gear ratio.

Tech Note 2: Input Shafts
Five different 22 tooth input shafts match QU10154 Countershaft Gear depending upon the year, make and model.

Tech Note 3: Common Failures
Typically, Countershaft gear tooth failures occur from one of three causes: low or improper oil, clutch pilot bearing failures (which cause misalignment of the input shaft), and excessive horsepower/torque (over 275hp/600 Lb-Ft of torque). Broken 3rd gear teeth are almost always caused by exceeding the demonstrated 600 Lb.Ft input strength limit of the NV4500.

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 4: 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 5: Matching Parts
Matching Parts for QU10154 Countershaft Gear:
QU10090 Modular Countershaft
QU10078 One Piece Countershaft Assembly for 5.61 Ratio
QK1129 Drive Key Kit
QU10174 30 Tooth Countershaft 3rd Gear
QU90020 NV4500 Manual Transmission Oil
TM1003 NV4500 Shop Manual
VSG1003DVD NV4500 Overhaul Video
For Input Gears, see Tech Note 2

Applications:

Chevy and GMC:
C1500, K1500, C2500, K2500, C3500, C3500HD, K3500 with NV4500 5 Speed: 1995

Dodge and Ram:
D and W Series with Gas Engines and New Venture NV4500 5 Speed Manual Transmission: 1992, 1993
Ram 2500, Ram 3500 with Manual Transmission: 1994, 1995

May also be found on some low production 1996 models.