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probably the result of poor maintenance. Posted by CMyles [Email]  (#1126) [Profile/Gallery]
(more from CMyles) on Mon, 15 Jan 2007 10:26:37
In Reply to: sorry right board!, whitesaab, Sun, 14 Jan 2007 23:13:01 Members do not see ads below this line. - Help Keep This Site Online - Signup |
Rainer,
Sorry man, sounds a lot like the final drive (differential) locked up. Although they are in a single alloy case the differential and the automatic transmission are completely separated by a bulkhead. The output/pinion shaft passes through the bulkhead with two opposed oil seals. That shaft carries the torque from the transmision section to the differential section and the bulkhead and two seals keep the automatic transmission fluid and the 80/90 gear oil (in the diff. section) from mixing. It's all too common for the 80/90 gear oil to leak out over time without the owner noticing. Every time they pull the tranny dipstick it shows plenty of ATF so it seems that all is fine. As the diff. runs out of gear oil there is actually plenty of noise and heat but many non-mechanic drivers don't notice it. Their first realization of a problem comes when the differential seizes up. It's not really a shortcoming with the venerable T37 automatic transaxle, it's just a routine maintenance issue. ALL transmissions and All differentials have the potential to develop a leak and lose their lubricant. Routine, periodic undercarriage inspection with a check of all lubricant levels is fundamental to the longevity, and safety of a vehicle. Anyone buying ANY used car (even a Saab) should inspect, or have inspected, the steering, suspension, brakes and fluid levels as soon as they take possession, for safety's sake. I always do, and have done that a lot for friends, family and customers and often find some significant problem that was unknown to the seller.
It's not surprising that the guys at the dealerships couldn't advise you. They generally don't want to have anything to do with cars this old (there are a few exceptions) and probably don't even have a mechanic that was around when classic 900s were new. That's why one of the most common phrases on this board is "Saab Indy", (independant Saab mechanic). You should find one in your area. He will be your best bet for a reliable assessment and repair.
You could try filling the diff. with fresh gear oil and see what happens but most likely the unit is shot and will have to be replaced. Of course there are a few other things that can cause such a lock-up (brakes, parking pawl, etc.) but I thought I'd address the most likely cause until we hear more. Lift the car, open the rear differential cover and see how the gears look, then go from there. (Stop tailgating trucks too). Good luck.
posted by 206.123.221...
, Mon, 15 Jan 2007 10:26:37 <-- Viewing This Message, Tue, 16 Jan 2007 19:32:03
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