4:88 vs 4:10 gears for f450 - Ford Powerstroke Diesel Forum
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post #1 of 11 Old 03-17-2011, 12:37 PM Thread Starter
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4:88 vs 4:10 gears for f450

i have a 4x4 cclb 08 f450 job 1 with 4:88 gears in it. this is way overkill for me cause i dont haul that heavy. i am currently getting 9.5empty and 8.5 hauling a small 6x12 trailer. i install spartan tuner, cat/dpf delete, and intake. hoping this will bring it up some(will know after trip to fl this weekend). with that being said the only other thing i can think of doing is changing gears. i can get 410 from randys ring and pinion for 2050 for all the parts. i will have to pay someone to install them so i dont know what that will cost yet. my question is how much will mpg improve from the gear change? anyone have these gears with the 6.4? thanks
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post #2 of 11 Old 03-18-2011, 04:36 AM
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I have the 410 in my F350 running the 275 as dially driver an as long as I keep it below 2000 RPM I get good fuel milage.But only going 60-65 MPH. I am looking at buying a new work/utility truck F450 and want to see if I can get it with higher gears for that reason. I would try to get higher gears than 410, The 6.4 has plenty of power to handle it .
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post #3 of 11 Old 03-18-2011, 04:50 AM Thread Starter
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so at say 70-75 mph will higher gears get better mgp? i think that the 450,s now come with 4:30 and the the 4:88 are not even offered. i thought the gears were the reason that the f250 were getting so much better mileage. they have the 3:73's but i think thats too low for the towing that i do, but the 4:88 are a bit much. thats why i was thinking somewhere in the middle.
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post #4 of 11 Old 03-18-2011, 05:08 AM
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When I say higher it means the number goes lower like 373 gears are higher than 410.Then the 430 and 488 are really low gears. But I don't think you can get higher than 410 gears for a F450. I will prob. go with 410 gears because I will have a utility body on it and F 450 have 19.5 tires.
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post #5 of 11 Old 04-13-2011, 04:02 PM
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Smile

4.10 gears work great ,I have done the swap went from 14.7 hand calculated to 21.3 mpg hand calced.I run 33 tall tires ,afe air box and afe 4"turbo back exhaust and sct tuner with idp tunes ,mileage calculated with 210 tune daily driver..http://www.powerstroke.org/forum/ima.../icon_ford.gif
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post #6 of 11 Old 04-13-2011, 04:09 PM Thread Starter
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perfect. thats what i wanted to know thanks. i think i will make the swap.
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post #7 of 11 Old 04-14-2011, 06:44 PM
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Originally Posted by bowtie540 View Post
4.10 gears work great ,I have done the swap went from 14.7 hand calculated to 21.3 mpg hand calced.I run 33 tall tires ,afe air box and afe 4"turbo back exhaust and sct tuner with idp tunes ,mileage calculated with 210 tune daily driver..http://www.powerstroke.org/forum/ima.../icon_ford.gif
I have an 02 f350 drw with 4.10 gears and I get now where close to 14 more like 12 on the highway. I just got it it's 4x4 and I put diy intake 6637 filter I would love to get at least 16 to 18 on the highway!! What do I need I was thinking 3.73 gears ? how much would that help?
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post #8 of 11 Old 04-15-2011, 10:00 AM
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Originally Posted by cbradley View Post
I have an 02 f350 drw with 4.10 gears and I get now where close to 14 more like 12 on the highway. I just got it it's 4x4 and I put diy intake 6637 filter I would love to get at least 16 to 18 on the highway!! What do I need I was thinking 3.73 gears ? how much would that help?
Yep me too. I was getting 14.3 with 4.10 gears, ais, exhaust and a 6 POS from php...I converted to SRW and it bumped it to 15...(all hand calculated) Lifted it a couple inches and I am back down to 14.1.

I'd love to see what people are doing to get +16 mpg....

2002 F-350, was a DRW, now a SRW (but kept the dana 80 ARB's front and back, 4.88 gears on 37's
AIS, 4 inch MBRP, 38R ww2, IHI bellowed up pipes
PHP 6 Pos Chip, swamps 140 volt mod
PMF coilovers and 4 link...front and back
2008 D60 up front, 2002 D80 out back
Psc hydro assist with ported hydroboost, p pump
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post #9 of 11 Old 05-02-2011, 12:05 PM
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Amen to that on the 16+ mpg's. 06 4x4 dually w/4.10's here and I get about 13 mpg too.

I know adding my tow tune, and tonnue cover helps a little, but not much to write home about. I've been reading good things about rev-x Distance +. Claims of 1 extra mpg.
About | REV-X Products, Inc. PLUS&B=Diesel

SOLD-2006 F-350 CrewCab, short bed dually, 4.10's, FX4/Lariat, PHP tunes & 58v FICM, 5" Diamond Eye exhaust, & much more....
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post #10 of 11 Old 05-03-2011, 02:00 PM
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i forgot to say also .. i run royal purple in the rear ends and tranfer case and rotel t6 full synthetic motor oil..and power source fuel additive in fuel ...
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