You wont be happy with it back to stock. And you'll still have to get the trans rebuilt. My vote is for the ATS trans. It shifts very nicely and can hold the power as long as you don't do a wot downshift from overdrive. I'm very happy with my ATS trans and Copilot. The trans is working very good with a 3000 stall tc as well. But, a 6 speed manual trans would be a blast in your truck Bill.
Hey Greg, it's good to hear from you again. Hope everything is going ok with you and your pup.