4.27 VS 4.56 - Ford Powerstroke Diesel Forum
6.4L Performance Parts Discussion What has or has not worked for you?

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post #1 of 31 Old 07-24-2007, 02:47 PM Thread Starter
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4.27 VS 4.56

I'm lookin to switch to 4.27, or 4.56 gears. I currently have 3.73, but I'm ridin on 35"s and I think I need upgrade. I had 4.56 in my last SD, but that was a 2000 gas V10. It made a big difference off the line. Can anyone recommend a ratio or tell me if its even worth the dough to switch. Thanks for the help.

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post #2 of 31 Old 07-24-2007, 02:50 PM
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with the torque of the diesel you will probly be fine with the 4.27's if you go too low you will start to loose milage



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post #3 of 31 Old 07-24-2007, 03:38 PM
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Man with 35s its probly not worth the money, i mean a 35 isnt much bigger than the stock..

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post #4 of 31 Old 07-24-2007, 05:09 PM
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35 is way bigger than stock by about 6 inches in a gasser with 3.55 you have to go up to a 4.56 just to get back to stock with a 35



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post #5 of 31 Old 07-24-2007, 05:10 PM
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post #6 of 31 Old 07-24-2007, 05:31 PM
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i ride on 37's and i have 3.73 gears. i think it is just fine. i had 4.10's in my old 1999 F-250 V-10, it was way to low geared i think. sure i could pull a house down but it wasnt good on the highway. can you say gas hog!!!!!

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post #7 of 31 Old 07-24-2007, 05:52 PM Thread Starter
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Quote:
Originally Posted by Rwalker29 View Post
i ride on 37's and i have 3.73 gears. i think it is just fine. i had 4.10's in my old 1999 F-250 V-10, it was way to low geared i think. sure i could pull a house down but it wasnt good on the highway. can you say gas hog!!!!!
yeah, the gas v10 hauled off the line but it sure ran high rpms on the highway.
I just don't wan't to waste a G if it wont make that much of a difference. But I also don't want to dog out the 6.0.

1970 F250 Crew Cab rebuilt/restored w/Cummin s 4bt

8v, M5R2 Tranny, VE pump, DennyT stage 2 pin, M&H Dynamic Timing, 3200k gov spring, Hx30/Hx35 Twins, 40hp styx, smoke screw screwed, star wheel cranked, Hydroboosted
91 Gillig Phantom, Converted transit bus, 6v92 Detroit Diesel

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post #8 of 31 Old 07-24-2007, 09:05 PM
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With 35's you should probably go with 4.30's or 4.10's. 4.10 will give you less rpm's on the higway and the 4.30's will get you off the line faster.

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post #9 of 31 Old 07-24-2007, 09:51 PM
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thanks lil red i dont know how people here can run masive tires with out gearing down... just jumping up to a 285/75 over stock i noticed a huge power loss i cant imagine going 3 inches taller with out gears



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post #10 of 31 Old 07-25-2007, 02:07 AM
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Yeah me either. I wish I would have went with 4.88's and my 39.5's. But oh well it works out since I'm gonna drop down to 37's and lose some lift so I can haul a gooseneck.

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