This week everybody is thinking about the IRS, but in some corners of Detroit, engineers think about those three letters all year long – and they’re usually smiling. That’s because IRS also stands for independent rear suspension, and that’s an IRS that’s not real "taxing" to love. Independent rear suspensions eliminate old-fashioned solid rear axles that are heavy and take up lots of room underneath a vehicle. They make cars and trucks handle better, and free up a lot space in the ...

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