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Pretty sure my 07 is 100k, but it never hurts to check them early
2007 5.9, 6speed, Quad Cab 4X4, Amsoil bypass system, Edelbrock Exhaust, Val Air dual disc, Dyna Trac free spin hub conversion, Dyna Trac ball joints, and more to come when the money gods allow
I pretty much go by the owners manual and mine says no need to check valve lash before 150K miles. Mine has 120K on it now, but I had the injectors replaced under warranty around 40K miles and asked the tech to run the valves (check lash) when he installed the injectors. I'll be doing it myself at 150K for peace of mind.
2014 2500 Laramie 4x4 CC Long bed black on black, 3.42 gears, 68rfe. Only mods so far are window visors and a tri-fold bed cover.
I did the valves on my '05 today (@ ~92k miles). The truck has not been used for heavy towing or hauling, but all of the valves were loose (at, or just outside the loose end of spec). So I'd probably err on the side of caution and do them sooner rather than later. It's easy and even if you take your time you can easily do it inside of two hours.
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