Is it worth the time and money to upgrade to a 6 speed trany on an 05 gmc 2500?
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I agree it is not worth it, and hauling the 6 speeds don't typically get any better mileage than the 5s and when T/H is engaged 6th is locked out anyway. If you drive an empty truck 5000 miles a month then maybe but it would still take a while to pay for itself.
The 06+ 6sp do. But in the SC kit a new TCM is supplied, it is programmed to lock out 6th in t/h.