Four of General Motors' full-size truck plants, three of them in the U.S., will go intermittently silent for a total of 21 weeks in order to retool for 2013 model year production. The Fort Wayne, Indiana and Flint, Michigan plants have both been in the news lately as recipients of multi-million dollar investments for just this purpose.

Fort Wayne will shut down for nine weeks over the course of 10 months, from January to October of 2012, while Flint will stop production for seven weeks from June to November, and the Arlington, Texas facility will be quiet from June to December for five weeks. The Mexico plant in Silao will find out its shut-down schedule next year. GM has been stockpiling a 90-day supply of its Silverado and Sierra pickups to make up for the loss of production.

When the 2013 models arrive, unconfirmed reports indicate we can expect a new forced-induction V6, the continuation of the 5.3- and 6.0-liter V8s, and the 6.2-liter V8 going into the heavy-duty versions exclusively.
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