how much would it cost to change the differential on my vehicle and the spark-pl on 1991 Nissan 300ZX

how much would it cost to change the differential and spark-plugs on my vehicle?

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2 answers
Do you maybe mean diff. FLUID?. $2165.00 , give or take $2000.00 , depending on if we ever find out what it is that you were really asking about.........nevre nimd.
are u asking to r/b diff or install only? do you mean like a minor tune up?