83 Celica GT 5-spd. w/ clanking noise when changing gears, need to know how to fix, not u-joint problem?

someone told me that there was a way to adjust the rear end by tightening something to reduce play? not too sure if this should work or does anyone have any clue or ideas or suggestions.....please help83 Celica GT 5-spd. w/ clanking noise when changing gears, need to know how to fix, not u-joint problem?
Yes it could be worn u-joints have them checked.

Fit new ones having grease nipples.

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