SSANGYONG Musso Sports N100 2003 Manual page 1253

Install the 1-2 shift fork and its selector plate.
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Push the shift shaft through the 1-2 shift fork.
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Place the selector arm and interlock plate in the cover
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Note the position of the interlock plate and selector arm.
Push the shift shaft through the 3-4 shift fork.
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MANUAL TRANSMISSION 5B-37