Motor Mounts and Linkage Bushings - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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Depending on the health of your motor mounts you may have excess movement in the engine and transmission unit. This may throw off the shifter alignment. This might explain why shifting is ok when the engine is not putting out a lot of torque but likely moving some due to weak or worn motor mounts when the motor is putting out a lot of torque. The motor mounts are rubber. Rubber deteriorates with age. Mileage aside, if the clutch has been replaced in a car with 60,000 miles I suggest the motor mounts have had a hard life. There are also several rubber bushings in the multi-jointed shifter assembly that is the interface between the shift shaft that comes through the firewall and the shaft that comes out of the transmission. Lastly, I second Neil on getting the alignment pins from Genuine Saab so you or your mechanic can do a good shifter alignment. Lastly, make sure you have the torque specs right on the aft subframe bolts. If these are not right you can get some movement in the subframe.
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