question for f450's - Diesel Truck Forum -
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post #1 of 4 (permalink) Old 03-08-2009, 10:12 PM Thread Starter
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question for f450's

I am getting ready to swap out my 3.55 rearend to a 4.30 and am curious what rpm you are running at 75mph and what tire size you are running.

thanks for any input.

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post #2 of 4 (permalink) Old 03-09-2009, 12:35 AM
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with the stock 19.5" tires I a running a tad over 2000 RPM at 65 MPH. I don't drive at 75 very much so can't tell you.
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post #3 of 4 (permalink) Old 03-09-2009, 01:25 AM
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At 65 I'm at about 2350 with 4.88's. It is 13% more than a truck with 4.30's. It is not that loud until about 70, at 65 I hear the turbo more than anything.
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post #4 of 4 (permalink) Old 03-09-2009, 07:09 PM Thread Starter
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thanks for the replys, I didnt realize my truck had 3.55's till after I bought it, if i was to do it all over again id have gotten a dually. my trailer is 16k full.
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