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One correction on the above post...11,400 GVWR is for the dually, the SRW 3500 has a GVWR of 9,900. GM's diesel trucks are pretty easy to understand. ALL trucks have the same engine, rear end and transmission...6.6L Duramax, 3.73, and six speed Allison, there are no options. Also, all 3500 series trucks, both DRW and SRW, come in a long bed only, again, no options.
If you have a dually, you are okay, if you have a SRW you'll be marginal at best.
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