which gears? - Ford Powerstroke Diesel Forum
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post #1 of 21 Old 06-08-2014, 05:16 PM Thread Starter
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which gears?

i have a 6" lift and hmmve 37 in tires on bead locks. trying to figure out what gear to run. im torn between 4.56 or 4.88. i looked at some calculators but all of them give a way different answer to what my highway rpm would be at.
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post #2 of 21 Old 06-08-2014, 05:19 PM
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which gears?

What gears and size tires do you have now? Also what rpm are you turning at 70mph?


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post #3 of 21 Old 06-08-2014, 07:57 PM Thread Starter
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not sure about the rpm i didnt look this afternoon but i have 3.73 in it and it sometimes rejects the thought of overdrive on the highway
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post #4 of 21 Old 06-09-2014, 08:48 AM
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4.30's
IMO
Do you tow?
I would find a gasser with a factory set of 4.30 to swap in.

Excursion 02 4x4 Silverline exaust superchip tuner

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post #5 of 21 Old 06-09-2014, 09:40 AM Thread Starter
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i tow a little. its mainly a car hauler with a truck on it. mostly a daily driver.
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post #6 of 21 Old 06-09-2014, 09:40 AM Thread Starter
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should i look for a v10 or v8? or do both come with the factory gears?
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post #7 of 21 Old 06-10-2014, 05:39 PM
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I found a v10 with 4.30's

Excursion 02 4x4 Silverline exaust superchip tuner

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post #8 of 21 Old 06-10-2014, 08:06 PM Thread Starter
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found a set of 4.56 gears from yukon for 100 bucks. now i have only set up 1 other rear diff and it was under close supervision. since i am not changing the carrier i should be good to install the factory shim on the pinion and bolt the ring gear to the carrier and call it done correct? i do plan to check the mesh of course but i shouldnt have to much of an issue i dont think. any opinions?
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post #9 of 21 Old 06-10-2014, 08:15 PM
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I regeared an f250 once, I paid to have it repaired a short time later. Good luck

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Excursion 2000 4x4 300K miles 238/100 P.I.S. Injectors 38RW/ billet wheel dyno proven tunes

99 F350 7.3 4x4 body build date 02/98 motor build date 12/97 19.5 ricksons (Sold)
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post #10 of 21 Old 06-11-2014, 05:58 AM
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You are correct. Make sure you use the factory shims. And make sure you don't miss match the carrier spacers and you should be good


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