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09-12-2006, 03:00 AM #3
Vet
CF Senior Member
My Corvette Photos
Member Since: Sep 2004
Location: Long Island NY
A few other bits of interesting info:
*Member vetteshop stated: “…in the past,I have
replaced a bunch of clutch packs in the C5's, they have
the same issue. Upon inspection of the removed clutch
packs, they do not fail, they look brand new with no
evidence of wear or damage. The issue seems to be a
varnish buildup on the plates that causes binding,
resulting in the noise when turning. This is why replacing
the fluid (with new additive) may only temporarily cure
the problem. The problem is the design of the rear
differential. Caprice's and Camaro's with posi rears have
had the same issue for years. The difference on the
Corvette is that there is not a cover that you can remove
to clean the clutch packs, such as every other
conventional posi rear end. The only way to clean the
clutch packs is to remove the rear from the vehicle and
completely disassemble it. One may as well install new
clutch packs after going through all that trouble…”
*Member calemasters stated: “…Original axle clutch
plates were fiber. New plates are carbon… I believe BG
production changed to the carbon plates in late
December of 2005… I spoke to one of the Getrag
engineers (he used to be on this board) but he was not
clear to why the grind chatter occurred with the fiber
plates. Just that the carbon plates fix this condition…
Time it takes to replace clutch packs: With Automatic
Transmission, 7.2 hours; With Manual Transmission 6.7
hours ”
*Member jabbott of Rat Pack Motorsports stated:
"These are some of the symptoms (chatter, etc) of a Posi
Traction unit. Usually you can change the oil or add
some slip additive and it will go away. Changing the
clutches is not going to make a difference. There are
only two ways to solve it (eliminate chatter) and they
both require a lot of work if the oil is not doing the trick.
You can have some of the carrier machined where the
clutches go in, we do this to fine tune our race clutch
setup but it could also be done for a street car to help
with chatter. The second is we can install a torque
biasing carrier which you would never have chatter
again. Both of these are very expensive options, in the
end the chatter is not going to hurt anything