QU10215 GM NV4500 1-2 Synchronizer Assembly With Shift Interlock

QU10215 1992-1994 GM NV4500 1-2 Synchronizer Assembly With Shift Interlock is a genuine New Venture Gear 1st-2nd Synchronizer Assembly for 1992-1994 GM NV4500 5 speed manual transmissions with 6.34:1 1st gear ratio. QU10215 is factory assembled and it includes QU10038 Hub, QU10081 Clutch Ring, QK1085 Interlock Parts Kit, and QK1100 Synchro Strut Kit. New Takeout part from brand new transmissions we disassembled for parts. NOTE: The shift Interlock feature was usually not used on transmissions with 5.61:1 1st gear ratio. 

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:
Interchangeable
Synchro Rings
NV4500 Tools
Matching Mainshaft Parts
Matching Synchronizer Parts
Matching Parts
Applications

Tech Note 1: Interchangeable
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 2: Synchro Rings
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 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 Mainshaft Parts
Matching Popular Mainshaft Part Numbers for QU10215 1st-2nd Synchro are:

Tech Note 5: Matching Synchronizer Parts
NV4500 Transmissions have 3 1st Gear Synchronizer Rings. Matching Synchronizer Parts 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 6: Matching Parts
Other Matching Parts for QU10215 1st-2nd Synchro:
QU10002 Synchronizer Ring, Center Friction
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
QU10052 1-2 Shift Fork
QU10061 Premium Bearing and Seal Kit 1992-1995 GM 4x4
QU90020 NV4500 Manual Transmission Oil
TM1003 NV4500 Shop Manual
VSG1003DVD NV4500 Overhaul Video
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

Applications
Chevy and GMC:
C1500, K1500, C2500, K2500, C3500, C3500HD, K3500 with NV4500 5 Speed: 1992, 1993, 1994