Up To Standards
Subject:
Diagnosing noise problems
in manual transmissions
Essential Reading:
Rebuilder
Shop Owner
Center Manager
Diagnostician
R & R
Author:
Mike Weinberg,
Rockland Standard Gear
Contributing Editor
Solving Common
Noise Problems, and
Problems with
No Solutions
Noise is one of the great myster-
ies of the transmission world.
Noise is subjective, and people
rarely can interpret noises in the same
manner. Noise travels much faster and
farther in solid objects such as the steel
of an automobile than it does in air.
There is driveline noise, engine noise,
suspension noise, exhaust noise and
road-generated noise.
down, listening intently to the trans-
Two-mass flywheel with sealed casing Two-mass flywheel, sealed casing
There is also the mysterious “never
had that before” noise. This noise usu-
ally comes to the customer’s attention
as a result of a change of habits creat-
ed by having shelled out a large sum
to repair their vehicle. After such an
expense, the customer is driving the
vehicle with the radio off and all inte-
rior appliances such as A/C shut
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The joint venture between the
GM Muncie plant and the New
Process division of Chrysler has
ended. The GM Muncie plant has
been closed and all the machinery
sold off. Chrysler kept the New
Venture name for the New Process
plant but no longer builds any of
the previous models.
Subsequently, Chrysler sold the
New Venture/New Process
Division to Magna International, a
major tier-one OEM supplier. This
partnership sucked $80 million to
$100 million of profit out of New
Process Gear when it was owned
by Chrysler and produced a great
number of transmissions for which
no OEM replacement parts are
available. When you have to re-
build one of the units you now
have to rely on aftermarket parts.
Many of these parts are well made
and will give good service, but
most of these Getrag-based de-
signs have noise issues that cannot
be resolved. If you are working on
one of these units discuss these is-
sues with the customer so you
don’t wind up taking responsibili-
ty for something you did not cre-
ate. TD
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