Hi

Just wondering whether it's possible for a modern (1991) Saab gearbox
to actually seize? The box on my 9000 cs 2.3t has been whining for a
while, and now it's louder and more like a hum. Happens at all speeds,
in all gears and even when coasting and with the engine off.

As the car's done 210k miles, it's not worth replacing, I'll just run
it until the box fails ... however, obviously I don't want it to sieze
and lock the wheels while I'm driving.

So, can the box actually seize in such a way as to lock the wheels?

Cheers

Gary Cook.

My guess is if it seizes at speed, the gears will get get destroyed.
The momentum of the car is to large to be stopped by it.

Gary,

Let us know how it goes. I had a '95 9k which had drop throttle whine.
Apparently, that can go for a while before it dies. Your problem sounds
like it is in the final drive portion of the box and is probably much
more terminal. Yes, It can seize and lock the wheels. If it is really
loud, it may be trying to tell you something. This is the only way
mechanical beings can communicate ;-) What is the condition of the car
otherwise?

KeithG

cook_gary (AT) hotmail (DOT) com wrote:

Keith

It's not really loud ... yet ... but it's definitely on it's way out.
Other than that, apart from a crackshaft position sensor that I'm
having changed soon to cure an intermittent stalling problem, the car
is fine ... a little bit tatty but it still drives like a dream....

It's a tricky one this, because how loud is loud?!? I mean, it could
last another 10 years or 10 mins....who knows!

Cheers

Gary


KeithG wrote:

yaofeng wrote:

It'll skid nicely though !


Graham

Salutations:

On 19 Apr 2005 01:34:30 -0700, <cook_gary (AT) hotmail (DOT) com> wrote:


Does it quiet down if you engage the clutch (assuming it's a 5 speed)?

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<cook_gary (AT) hotmail (DOT) com> wrote

failure. Have you noticed the gear whine from some commercial vehicles?
Gear whine used to be common on all forms of gears if they were rotating
quickly enough, with modern gear cutting machinery annd modern gear forms we
have come to expect quiet running. I think the eventual failure will be loss
of drive.

My 1991 9000T gearbox didn't seize, but it remained in first gear even when
the shift lever was in neutral. It made for quite a surprise when I wanted
to come to a stop, although the grinding noises (most likely from a broken
shift fork) should have been fair warning.

This happened about 2 years ago at 130K miles. I was able to replace the
transmission with a warranted rebuilt unit for US$2000. That includes the
cost of replacing all the bits I broke along the way, a new clutch, pressure
plate, slave cylinder, and flywheel resurfacing. If the car is otherwise
sound, it would be a shame to chuck it.

Walt Kienzle

<cook_gary (AT) hotmail (DOT) com> wrote

Hi

No, no difference when clutch is depressed...it's purely speed
dependant.

final drive stage by the sounds of it ...

Gary


Dexter J wrote:

yeah, I understand what you say ... but isn't it likely to be a bearing
rather than gear whine? or is it possible for one of the gears to be
deteriorating and causing the whine instead of the bearing? If it's a
bearing instead of a gear failure, then if the bearing siezes or, more
likely, disintegrates presumably there'd be a hell of a noise and at
somepoint something would break catastrophically, or it'd seize????

Really, if I'm doing 80mph I'd like it to lose drive instead of
freeze!!!

Gary