Need advice about LS3 DRY swap

[kipps]

For a spirited c10 that doesn't do any towing or serious hauling, any stock Camaro engine/trans combo will be a good choice. The 2010-15 Camaros came with the 6l80 paired to the L99 engine(same as a LS3, but with VVT and AFM), or with the tr6060 paired to the LS3. Both combos are highly regarded.

Like Mongocanfly mentioned, the shifter position will likely need some research on the tr6060. It's mounted at the extreme rear of the transmission, which will be somewhere under the seat of a c10.

Rear axle ratios will be important. A good starting point, is to compare your c10 to a Camaro. Google says the weights of your truck and a gen-5 Camaro are 3500 and 3750 respectively. So your truck is slightly lighter than the Camaro. It appears the manual trans Camaros came with 3.45 gears, and folks frequently upgrade to 3.73 or 3.91 gears. Anywhere in that range should put you in the running.