Service Information

Volt

Whine/Growl Noise That Changes with Vehicle Speed

Checks

Causes

Input Shaft Thrust Bearing Assembly

Inspect the bearing for wear or damage.

Sun Gear Carrier Thrust Bearing Assembly

•	Inspect the carrier assembly for damaged pinion gears, thrust washers, pins, and rollers.

•	Inspect for a damaged centre support roller bearing assembly.

•	Inspect for damaged thrust bearings.

•	Inspect for damaged sun gears.

•	Inspect the carrier assembly for damaged output carrier rear sun gear thrust bearing (captured).

•	Inspect for damaged or stripped splines on the output carrier assembly.

Internal Gear Thrust Bearing Assembly

Inspect the bearing for wear or damage.

Front Differential Carrier Assembly

Inspect for damaged gears and bearings.

Front Differential Drive Pinion (w/Transfer Gear) Gear Assembly

Inspect for damaged gears and bearings.

Variable High 2-3-4 Clutch Hub Thrust Bearing Assembly

Inspect the bearings for wear or damage.

Variable High 2-3-4 Clutch Housing Thrust Bearing Assembly

Inspect the washer for wear or damage.

Input Shaft Bushing

Inspect the bushing for wear or damage.

1-3R Clutch Housing Bushing

Inspect the bushing for wear or damage.

Internal Gear Thrust Washer

Inspect the carrier assembly for damaged pinion gears, thrust washers, pins, and rollers.

Internal Gear Thrust Bearing Assembly

Inspect the bearing for wear or damage.

Output Shaft Thrust Bearing Assembly

Inspect the output carrier inner sun gear shaft bearing for damage or wear.

Variable High 2-3-4 Clutch Housing Thrust Bearing Assembly

•	Inspect for damaged or restricted fluid filter assembly.

•	Inspect for damaged fluid filter seal assembly or improper sealing interface (leaks, fluid aeration).

Internal Gear Thrust Washer

Inspect the washer for wear or damage.