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post #1 of (permalink) Old 03-13-2019, 09:05 PM Thread Starter
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Advice on safe interstate RPMs 65-80 mph

Just curious of what you fellas get as far as Rpms and at what speeds you get with your setups and advice on what changes I could make to get mine where I’d like it. My setup is a 94.5 7.3 PSD, single cab long box. It’s 4x4 and has roughly a 7 inch lift with 35s and is backed by a ZF5 close ratio trans. As far as the tag says on the rear it should have a LS 4.10 gear in it. I’m concerned about long hauls in this truck because at say 75-80 mph I’m turning 2600-2700rpm and I’m aware the valve trains in 7.3s aren’t exactly the greatest. I would like to make a trip to the beach in it (6-7 hour drive all interstate driving) is it a bad idea to run it at those RPMs for that much time? I have considered swapping to 3.73s maybe 3.55s as I don’t tow all that much very often but I have pulled up to 10k and will again at some point.
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