I'd take it to another shop and have them look at it. I don't know anything about driveshaft stuff but think a good shop will be able to advise.
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'03 Freightliner FL112, 295" wheel base, with '03 United Specialties 26' living quarters, single screw, Cat C12 430 h/p 1650 torque, Eaton 10speed , 3.42 rear axle ratio
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