
HOLDEN SERVICE TECHLINE ___________________________________________________________DECEMBER 1, 2000
20 20
LSD CHATTER NOISE
VT, VX, WH (V8 Engines only)
(GRO UP 4) TL011-0401
The following information is repeated from All
Dealer Letter: DL 65/00, and is repeated in this
Techline only to ensure that all Dealership
Service personnel are aware of the information
noted. Refer to DL 65/00 for all actions.
PROBLEM DESCRI PTION
This letter is to advise Holden Dealerships of a
corrective fix for LSD (Limited Slip Differential)
final drive units that exhibit a “chatter” noise
when turning. This noise may be present in
some VT, VX and WH vehicles with V8 engine.
LSD chatter may be heard when the vehicle is
turning left or right when travelling in a forward
or reverse direction, and is most pronounced
when negotiating sharp bends at low speeds
and parking manoeuvres where differential
action is initiated. The occupants of the vehicle
typically hear a noise originating from the LSD
drive unit (axle). Chatter can also be
experienced by the driver as a “grabbing” feel
during the operation of the LSD. The chatter
noise is caused by diminished sliding lubrication
qualities (using the existing oil) of the LSD cone
fr ict ion sur faces within the final dr ive unit.
Holdens supplier of LSD final drive units, Spicer
Axle Australia (SAA) - previously named BTRE,
has assisted in the definition of the cause of
LSD chatter, and provided a rectification
process, described below, for application to
complaint vehicles.
Affected Vehicles
For reference, V8 LSD final drive units with the
following codes/part numbers are af fected:
VT: EB 92053537, EH 92053542, EM
92078300, EP 92078301, ET 92082622.
VX: FA 92085123, FC 92085125, FE
92085127, FH 92085129, FF 92085136.
WH: EH 92053542, FH 92085129
(Refer to SIP Service Information, Group 0A for
location of final drive unit identification label).
Dealership Action
A rectification procedure is to be carried out to
add an approved friction modifier (supplied by
SAA) to improve lubrication. As the friction
modifier required is not compatible with the
currently f itted Viton material pinion seal, a new,
high performance, Polyacrylic material pinion
seal must be fitted to prevent possible future
leaks through seal degradation. Both friction
modif ier and new seal will be supplied in a “Field
Fix Kit” supplied by SAA.
On examination of a customer complaint vehicle,
and confirming LSD Chatter is evident – fill out
all requested details on a photocopy of the SAA
Rear Axle Assembly Diagnosis & Changeover
Request For m (Attached t o DL 65/00) and f ax to
SAA on Fax Number: (02) 9754 9310.
On receipt of a fully completed SAA Rear Axle
Assembly Diagnosis & Changeover Request
Form, SAA will contact your Dealership by
telephone to confirm acceptance of the request,
advise that a “Field Fix Kit” is being sent by
courier to your dealership, and the approximate
delivery date/time.
If diagnosis to confirm LSD chatter noise has not
been carr ied out, a simple Diag nosis Procedure,
provided below, must be carried out to confirm
the noise cause, and ensure that the rectif ication
procedure will correct t he com plaint.
If any complaint vehicle is presented which
carries a filler plug I.D. tag containing the words
“FIELD FIX” or “& FRICTION MODIFIER” – the
procedure has already been carried out to the
unit and it must NOT have the procedure carried
out again. In a case such as this, a fully
completed SAA Rear Axle Assembly Diagnosis
& Changeover Req uest For m should be f axed to
SAA to req uest a replacement final drive unit.
Parts Information
To carry out the rectification procedure – the
following parts are requ ir ed:
“Mobilube SHC ID” oil. Quantity: 1.5 litres –
Dealership to procur e.
A Field Fix Kit - Supplied by SAA, which
contains the following items:
1. One new Polyacrylic pinion seal.
2. One bottle (100 ml) of friction modifier.
3. A replacement I.D. tag .
4. An extract from the VX and VT SIP Service
Information, referring to seal replacement.
(Also applies to WH. Copies are included as
Attachment s to DL 65/00).
5. T he Material Saf et y Data Sheet f or t he f rict ion
modifier.
6. The diagnostic and rectification procedures
detailed below.
Diagnosis Procedure to define LSD Chatter
(if pr eviously not able to confirm):