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Message: <blockquote data-quote="tplee" data-source="post: 1237019" data-attributes="member: 16148">You'll also definitely need to go to a shorter gear. If 40s, you'll prolly want a 4.88.  Might still wanna opt for 4.88s on 39s.  Going to 37s myself in the next few weeks and will decide on moving to 4.56s after running them for a while. I've personally run 5.13s on an old Chevy K5 running 38.5" Super Swamper TSLs... But that was also partly due to the anemic bone stock TBI 350 I was running. 400 HP and a 6 speed auto tranny certainly changes things.Also, didn't realize some of my earlier posts about checking larger tire fitment weren't addressed to the OP.... You'll wanna check out my last post on what I'd do to see if 40s would put you into the firewall on your current wheel...assuming you are staying with your current wheel.Sent from my Pixel using Tapatalk</blockquote>