Hard launches are not recommended for 1st 300 miles, per Ram…NOT for the engine, but drivetrain. Full throttle in 1st gear puts a lot of torque into the diffs & transfer case. Those need time to wear-in.
Ram recommends full-throttle on highway after 60 miles. That will bring the engine to redline (so it’s not about avoiding redline), but it’s less strain on the diffs & transfer case due to the higher transmission gear selection at highway speed.
Remember, we are talking about a high tolerance, plasma spray bore engine. In 60 miles, it will do all the “wearing in” that is needed to safely hit redline. If it won’t handle redline at 61 miles, it’s a poorly built example & needs to be blown up while under warranty.
Now, I will be changing my oil/filter at 1200 miles. Probably don’t need to, but old habits die hard. I’ve looked into changing diffs & transfer case…if anything, an early fluid change might benefit the transfer case as it varies front/rear torque split via drive modes, therefore it must contain clutches & generate heat. Diff failures are so uncommon if used within spec, so I’m going to stick with “severe duty” fluid change schedule on those.