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[Web Creator] [LMSOFT]
VX Commodore Gearbox Issues
Phoenix Mechanical
Soaring
Harsh Transmission Shift Gen III - Some VX transmissions may have a harsh 1-2 shift and a harsh 2-3 shift. Revised PCM calibrations with improved transmission shifts were introduced August 2001, along with a revised 1-2 shift accumulator.

Shift 1-2 Accumulator - Part number 24220143

GEN III Vibration -Some owners have reported a mild vibration when the vehicle is in gear with the a/c on, or with the vehicle in gear and a steering load is applied, or at low engine driving speeds between 650 and 1000 rpm. One cause of this can be a stressed driveline.

One sign of a stressed driveline is a bent catalytic converter bracket. Extra gearbox mounting bolts can be added, along with different spacers on the converter bracket, which in most cases will overcome excessive driveline stresses.

Vehicles built before vin # L647630 (14/10/2000), require 2 additional nuts and bolts to be fitted to the gearbox crossmember.

Bolt - Part Number 92138301

Nut - Part Number 11086962

Vehicles built after vin # L647630 (14/10/2000), already have studs inserted in the crossmember, and only require 2 additional nuts, as above.

Torque nuts to 45-55Nm

Spigot Bearing Noise - A squeal may be heard from the spigot bearing, at the first use of the clutch pedal after a cold start. The noise may repeat several times when the clutch is disengaged, during engine warm- up. Possible causes can be the incorrect fitment or damage to the spigot bush, or the lubricant used on the spigot bush dries out. Revised tooling was introduced to minimize possible damage, and the spigot bushes are now impregnated with synthetic oil (10% molybdenum disulphide).


Spigot Bush - Part number 92116034

Clutch Pedal Squeak - The clutch pedal to clutch master cylinder pushrod pivot pin and bush may become dry and squeak. Applying Molybond GA10 Grease to the pin and bush will help reduce squeaks.

Gearshift Knob Rattles Gen III Manual - The gearshift knob may vibrate to the point where it can generally be heard in 3rd or 4th gear at wide open throttle between 2500 to 4000 rpm. This condition is a result of excessive clearance between the shifter knob and the shifter lever. From March of 2002, gearshift knobs were glued on.

Gearshift Rattles Gen III Manual - Under certain driving conditions some VX's may develope a rattling gear shift lever. This condition is different to gear knob rattle. The cause of the rattle may be due to excessive
clearances in the remote shifter linkages. A revised remote shifter was introduced late 2003 to eliminate rattles.

Shifter Upgrade Kit VT/VX type - Part number 92147248

Soft or Low Clutch Pedal (Gen III) - In some VX's, the clutch pedal may feel soft and/or has a low disengagement point, along with some difficulty selecting gears. A cause of this can be the clutch slave cylinder. In certain situations, a corrosive chemical reaction can occur between the clutch fluid and the clutch slave cylinder housing. This chemical reaction can produce a gas in the hydraulic system that can give a soft or spongy feel to the clutch pedal. A revised clutch slave cylinder was released late 2003. The new cylinder was made of a different alloy, and was more resitant to chemical reactions.

Clutch Slave cylinder assembly (revised alloy) – Part number 92067460

Excessive Gear or Road Noise from Shifter Area (6 speed Manual) - Some VT's may have excessive road or gear noise coming from the transmission shifter area. This can be caused by a split inner boot, or a loose retainer plate. A revised gearshift boot and retainer plate was introduced early in 2002, which is of a more durable material (white in colour), and the retainer plate has 4 studs and nuts (instead of 4 holes and nutserts in the sheet metal).

Gearshift Boot Assembly - Part number 92065868

Gear Engagement (Gen III Manual) - Some VX's may have trouble selecting reverse gear, or the selector does not go into reverse completely. When the clutch is released, grinding of the gears may be heard if reverse isn't fully engaged. The gear selector may also need to be physically held in reverse to use the gear. A possible cause can be a circlip missing from the forward pivot of the shifter rail. A missing circlip can allow the gearshift pivot pin to partially disengage and become loose, making gear selection difficult.

If excessive effort is used for gear changes, the Remote Shifter Mechanism front pivot ball may dislodge from the nylon retainer. If the pivot ball dislodges, no gear selection would be possible. A metal reinforcing plate was introduced to prevent the ball from dislodging.

T/Bar Damage - The t/bar shifter base may be damaged by the front tailshaft coupling if the car is subjected to extreme rough road usage. A revised rear transmission mount was introduced mid 2002, that also has a travel limiting bracket to help reduce this occurance.

Transmission Mount - Part number 92117399