Production of several ’04 fullsize pickups, SUVs and vans built by General Motors Corp. was unaffected when the auto maker temporarily halted output March 12 of the transmission used in the vehicles, the auto maker says. The 4L80/4L85 gearbox is made at Willow Run. GM corrected the transmission’s faulty pump the same day – before inventory of the gearbox was depleted at the six assembly plants making the trucks. It’s the second black eye in less than a month for GM’s Powertrain ...

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