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I took the pinion out of the RWD e90 rack and it’s 10 teeth!
Removing the bolts and then sliding off the pinion top cover. I held the splined end in a vice and used a mallet to tap the rack down and away using gravity’s help
The helical teeth on the pinion are cut only at the very end. Therefore shortening it for use in the AwD application is not possible.
Also the angle at which the body holds the pinion is different. Putting the RWD parts inside the AWD is not going to be possible.
The the pinion angle on the e46 awd visually matches the e90 awd rack.
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