Over 150 workers who supply parts for Jaguar Land Rover's Halewood factory are to strike in a dispute over job cuts and pay.
The Unite members are employed by IAC and make dashboards at the JLR site.
IAC is planning to cut 87 roles, remove shift premiums and reduce working hours for remaining staff.
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Unite said the workers recorded a 100% yes vote in favour of industrial action on a turnout of over 90%.
The union added the employees are calling for all redundancies to be voluntary and that their pay is not reduced.
Unite general secretary Sharon Graham said: "IAC is being entirely opportunistic. Its finances are more than healthy. It is clear these plans are an unnecessary money-grab against staff, put forward because they mistakenly think the workforce is vulnerable.
"Unite always defends our members’ jobs, pay and conditions and IAC’s workers have the full support of the union in taking strike action."
The dates for strike action are expected to be announced in the coming days.
Unite regional officer Mike Gaskell added: "Strikes will undoubtedly cause disruption to JLR’s production but that is entirely the fault of IAC for shamelessly attacking our members’ jobs and pay.
"The company needs to give cast iron guarantees that any redundancies will be voluntary and take the needless reduction in pay off the table."
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