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could be one of many things - could you descibe it with a little more detail - sounds, feelings - and so on. Prolly the syncros tho on their way out which = time for new trans or rebuild which = lots of $$ unless you can do things yourself. :?
 

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The real problem is the trannies in the 900's were originally designed to fit under a motor developing between 80 and 100 horsepower, with four speeds in a light small car.

But in the case of the 900's and SPG's, you are suddenly pumping twice the power, with another gear in there in a heavier, larger luxury car.

The 9000's and new 900's have much less trouble with transmissions since the transaxles are much better adapted to the engines.
 

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Smaart Aas Saabr said:
The real problem is the trannies in the 900's were originally designed to fit under a motor developing between 80 and 100 horsepower, with four speeds in a light small car.

But in the case of the 900's and SPG's, you are suddenly pumping twice the power, with another gear in there in a heavier, larger luxury car.

The 9000's and new 900's have much less trouble with transmissions since the transaxles are much better adapted to the engines.
The tranny of the classic 900 was designed to support about 185 hp (185hp is the power of a spg fitted with the reed apc box) this is why saab never try to make his red APC box better. the trany is well designed but it is important not to accelerate strongly in first and second gear. the second thing to do is to mahe gearoil ands not motor oil like saab said!! redline is very good.
 

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The design of the gearbox changed very little from 1979, and the fastest 900 turbo 8V was only putting out 145 bhp. In addition it is basically a 4 speed box with a 5th gear added, so there's not much room in there. After 1990 various bits were strengthened on it, mainly the pinion bearing, but to accommodate this the casing is actually thinner on 1990+ cars, so its still pretty weak. Many cars still have transmission problems running stock levels of boost.
 
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