What gear ratio - Ford Powerstroke Diesel Forum
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post #1 of 4 Old 04-12-2009, 06:45 AM Thread Starter
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What gear ratio

What is a good gear ratio if I am running 37" tires and I tow a 12000 LB 5th wheel. Dont want to kill Hwy MPG but still wont pulling power. Would 4.10 be enough or 4.56 be to low

6.4 stock
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post #2 of 4 Old 04-12-2009, 06:58 AM
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i would go with 4:10s, thats what i have in my truck. the 4:56s would give you alot more power thought but i would not put them in unless i was running a 40in of taller.

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post #3 of 4 Old 04-12-2009, 07:00 AM
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If you had 35 inch i would say 4.10. Seeing as you got 37 inch put in 4,30 ratio. You could do 4.56 also if you tow alot,and heavy!
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post #4 of 4 Old 04-12-2009, 07:41 AM Thread Starter
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Anyone running 4.30 with 37s how does the truck pull with that combo. What is the RPM of the truck at 70 mph ?

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