5.13's in ours and they are fine IMO. If you travel much unloaded then maybe the others might be better but for us, we tow our boat and stacker trailer and its just right. (Cant really go much faster than 60 cause of calis laws on towing)
This is an older thread, you may not receive a response, and could
be reviving an old thread. Please consider creating a new thread.
Diesel Place
A forum community dedicated to Chevrolet and GMC diesel truck owners and enthusiasts. Come join the discussion about duramax engines, performance, builds, modifications, classifieds, troubleshooting, maintenance, and more!