What RPMs @ 75 mph - Ford Powerstroke Diesel Forum
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post #1 of 31 Old 10-28-2010, 04:21 PM Thread Starter
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What RPMs @ 75 mph

i have a 97 crew cab 250 4x4 with a ZF5. im running 2650-2700 rpms at 75 mph. i was wondering what everyone else is running at this speed. i'm pretty sure i have 4.10s but i havent pull the cover to verify it. thanks for any info guys.
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post #2 of 31 Old 10-28-2010, 04:31 PM
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yea thats 4.10s,im at 2300-2400 in 75 and i have 3.55's

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post #3 of 31 Old 10-28-2010, 04:33 PM
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thats what im running at 75,bout a 1/4 inch above 2500 rpm should be 80mph
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post #4 of 31 Old 10-29-2010, 05:47 AM
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yup 4.10 gears for me. too i am runing reight at about 2500 at 70 mph on 33" tires

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post #5 of 31 Old 10-29-2010, 05:48 AM
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my 4.10s at 70 was 2300ish

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post #6 of 31 Old 10-29-2010, 09:19 AM
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75mph is 2500 on the nose for me and thats 4.10s

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post #7 of 31 Old 10-29-2010, 10:48 AM
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Quote:
Originally Posted by Jarrod B View Post
my 4.10s at 70 was 2300ish
Same here Jarrod.

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post #8 of 31 Old 10-29-2010, 11:47 AM Thread Starter
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Ok thanks fellas. i just like to go when i travel and am afraid to run it at 80mph. so 3.55s or 37s. the should yield about the same result. the truck would look alot better on 37s. whats ya'lls opinion on towing. i very rarely pull more than 10k lbs. i run 37" iroks on my 07 and it pulled fine. i am planing on swamps 1.5s and custom chip hopfully not to much longer because i need to change my head gaskets and wiring and have 2 injectrs going.
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post #9 of 31 Old 10-29-2010, 11:51 AM
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well, now our 3.55 idi zf5 is around 2100 at 70. so not likely with 3.55s at 80mph.

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post #10 of 31 Old 10-29-2010, 12:01 PM Thread Starter
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well my goal was to be able to run 80 and run the ame rpms i was running at 75. so running 2700 rpms at 80 mph instead of at 75. i would travel at 75 towing but unloaded id like to be able to bump it up.
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