Australian Car Repair Issues? Ask an Auto Mechanic for Answers ASAP
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Dropping out of gear is a sign of cluster or mainshaft endfloat within the transmission or worn selector linkage or cables.
The shifter mechanism should be inspected for wear and maladjustment.
Your noise in the back could be exhaust or suspension related, so both concerns need to be inspected on a hoist.
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I hope my advice has been of assistance to you.