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Car Forum / Saab Cars / March 2006C900 funny transmission sound in 3rd
Recently the '88 C900 (5 speed) gearbox has been making unhealthy sounds. I've noticed a slight whine in 5th, and then more recently when engine braking in 3rd it makes a somewhat rattly/grindy noise, not really nasty but not healthy either. Is this a common problem? I'm curious if the transmission is doomed to imminent failure, or if this is simply a nuisance that may not cause any real problems for years. > Recently the '88 C900 (5 speed) gearbox has been making unhealthy > sounds. I've noticed a slight whine in 5th, and then more recently when > engine braking in 3rd it makes a somewhat rattly/grindy noise, not > really nasty but not healthy either. Is this a common problem? Yes, the pinion bearings were beefed up a year or three after '88. > I'm > curious if the transmission is doomed to imminent failure, or if this is > simply a nuisance that may not cause any real problems for years. Only if you don't drive it much. Get it fixed (pinion bearings at least, more if you've driven it much) or find another box. '90 I think is when it was improved, I'm sure someone can confirm or correct. Dave >> Recently the '88 C900 (5 speed) gearbox has been making unhealthy >> sounds. I've noticed a slight whine in 5th, and then more recently when [quoted text clipped - 10 lines] > least, more if you've driven it much) or find another box. '90 I think > is when it was improved, I'm sure someone can confirm or correct. I heard '89, but it may well depend on the market. Once repaired, the older boxes can be "strengthened" by using a steel inspection cover plate. I think if you're getting grinding noises on over-run/engine braking then it may well be very close to failure and I'd be inclined to have the box looked at with a view to repair. Of course, driving style will affect things so take it easy on the acceleration and perhaps use your brakes rather than the engine until you have it fixed. Thereafter, I can't see why engine braking will put any excessive strain on the box. Paul 1989 900 Turbo S http://saab.go.dyndns.org/ >>>Recently the '88 C900 (5 speed) gearbox has been making unhealthy >>>sounds. I've noticed a slight whine in 5th, and then more recently when [quoted text clipped - 27 lines] > 1989 900 Turbo S > http://saab.go.dyndns.org/ What's involved in replacing these bearings? I'm quite adept and performing extensive repairs and have done a lot of engine work, I've never attempted to repair a gearbox though. I'm assuming it has to come out of the car and be disassembled? >What's involved in replacing these bearings? I'm quite adept and >performing extensive repairs and have done a lot of engine work, I've >never attempted to repair a gearbox though. I'm assuming it has to come >out of the car and be disassembled? Have a look at the Twinsaab's manual transmission rebuilding guide at: http://www.twinsaabs.com/tranny/tranny.html to get an idea of what's involved in a home rebuild job if you want to attempt it yourself. Uprated pinion bearings are sold by Swedish Dynamics I think for something like US$200 to 300. Craig.  SignatureCraig's Saab C900 Page at | Craig's Classic Saab Workshop - Sydney .au http://lios.apana.org.au/~c900 | http://www.classicsaab.net and other URL's Email: c900@lios.apana.org.au | For Saab 99/C900/9000 Enthusiasts World-Wide! Alternate: saabonaut@gmail.com | Web-forums, galleries, library, links, etc. The car is almost 20 yrs old what do you expect? > The car is almost 20 yrs old what do you expect? My Volvo Turbo is 22 years old, I regularly thrash it, and the transmission is holding up fine, so I guess that's what I've come to expect. Needless to say, the Saab trannies obviously are a weak spot, I do still like the car though. > The car is almost 20 yrs old what do you expect? Thanks for removing any question about the usefullness of your messages. <plonk> |
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