"The following info is supplied by Dennis, Who works at EBB. EBB are SAAB specialists.
Please visit them.
HTTP://www.ebb.se
Strengthening
The most durable alternative is a chill cast (kokill) 4-speed gearbox. With a change of Pinion bearing and making of a steel cylinder that replaces the original distance ring in between the bearings. Due to this mod the pre-torque of the bearings should not change.
Then use a 32/25 primary gear. This will result in gear box that should manage up to aprox 230 BHP.
A 5 speed gearbox is possible to mod in the same way. But due to the different model the gearbox is more flexible in the casing. When flexing the 3:rd gear will get broken! The tooth of the gear will just break.
Gearbox Oil
SAAB Has for years recommended motor oil for the gearboxes. This is just madness. (would you use gearbox oil instead of motor oil? Shouldn't think so!) The bearings and the end gear in the SAAB gearbox needs a real gearbox oil.
SAAB recommended the motor oil due to the gearbox would be easier to shift gears in. Then they forgot that it takes some special lubrication for the bearings and such, to keep them from break before theirs normal wear. Hence all 900/9000/900NG with broken pinion bearings.
Then changing the oil is important. But everyone has not understand this yet, not even some of the larger SAAB workshops.
There will always be some particles from the gears, Sync-rings, etc. So, the oil should be changed at least each 50000-60000 km.
If this is not done, the particles will stick to the bearing surfaces and "presto" the bearings will be worn out.
Dennis recommends two different types of Quaker State gearbox oils. He has great experience with these and tests has proven that they are great.
- For daily use (stock, no racing) use Qudralube 75W
- For hard tuned cars and racing use QS2105
The gearboxes will be very easy-shifted and they will last longer.
"
Tää on bongattu taasen 900aero sivuilta
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Itseasiassa sen laatkion hajotti se hullu sutiminen (etuiskarit), mutta tänään just hain iskarit shimmityksestä ja nyt alkaa olemaan sellaset kun pitääkin.