I suppose changing to 4:10 will up the capacity, but do nothing about payload. Check your payload ratings on the truck and make sure you aren't exceeding it with the Raptor pin weight. I was exceeding it on my 08 2500HD gasser and did the right thing and sold it and got a 1 ton.
Just food for thought. Btw, my 1 ton tows my 12k (loaded) fiver so much better.
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