4.10 to 3.55? - Ford Powerstroke Diesel Forum
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post #1 of 18 Old 01-24-2013, 12:33 PM Thread Starter
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4.10 to 3.55?

Ive got a chance at a d60 front and 10.25 rear for cheap. The only thing is ill be going from 4.10 to 3.55 with a locker rear. Is any getting any better fuel mileage? I was hoping with higher gears and all that torque i could still run bigget tires. Any advantages or disadvantages? I want to know what you guys think about this swap. Thanks!

97 f-250 PSD, 85k as of 5/23/14, ZF5, silver w/ red stripe
Dana 60, 4in MBRP exhaust, Southbend clutch w/ single mass, Actual Tymar intake
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post #2 of 18 Old 01-24-2013, 12:53 PM
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Better hwy economy, won't star off as torquey when loaded tho

-Kris-
2011 f150 ecoboost 4x4 323/452 on php dyno 11/16/13
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The stock downpipe in an OBS is flat because I'm a ginger.
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Well at least you caught the loose bolts before they cause any damage. Nothing worse than a sloppy hole
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post #3 of 18 Old 01-24-2013, 01:13 PM Thread Starter
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Well its mainly a daily driver. Sometimes tow.

97 f-250 PSD, 85k as of 5/23/14, ZF5, silver w/ red stripe
Dana 60, 4in MBRP exhaust, Southbend clutch w/ single mass, Actual Tymar intake
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post #4 of 18 Old 01-24-2013, 01:50 PM
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How much do you tow tho is the big issue

-Kris-
2011 f150 ecoboost 4x4 323/452 on php dyno 11/16/13
1995 CCLB DRW 324K
2001 CCLB DRW 319K
Dp tuner infinity, exhaust, intake, chipped, tricked, and wrecked


Quote:
Originally Posted by marine5811
The stock downpipe in an OBS is flat because I'm a ginger.
Quote:
Originally Posted by alberta 7.3
Finding a decent woman is like shopping for a used truck. You spend most of your time picking through the money pits, wrecks, and basket cases until you find one that you can tolerate
Quote:
Originally Posted by JJFLASH
Well at least you caught the loose bolts before they cause any damage. Nothing worse than a sloppy hole
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post #5 of 18 Old 01-24-2013, 03:02 PM Thread Starter
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Not a lot lol. when i do its a car

97 f-250 PSD, 85k as of 5/23/14, ZF5, silver w/ red stripe
Dana 60, 4in MBRP exhaust, Southbend clutch w/ single mass, Actual Tymar intake
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post #6 of 18 Old 01-24-2013, 03:52 PM
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I have 3.55 gears and am running 35" tires with a 5 speed tranny and have no complaints

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post #7 of 18 Old 01-24-2013, 04:02 PM
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If its just 1 car and not a huge one (limousine, CClb 4x4 pick up, or something realy large one a huge trailer) your probably not gonna notice a difference other than cruising speed/rpm difference when your going, but it should be just fine for ya

-Kris-
2011 f150 ecoboost 4x4 323/452 on php dyno 11/16/13
1995 CCLB DRW 324K
2001 CCLB DRW 319K
Dp tuner infinity, exhaust, intake, chipped, tricked, and wrecked


Quote:
Originally Posted by marine5811
The stock downpipe in an OBS is flat because I'm a ginger.
Quote:
Originally Posted by alberta 7.3
Finding a decent woman is like shopping for a used truck. You spend most of your time picking through the money pits, wrecks, and basket cases until you find one that you can tolerate
Quote:
Originally Posted by JJFLASH
Well at least you caught the loose bolts before they cause any damage. Nothing worse than a sloppy hole
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post #8 of 18 Old 01-24-2013, 04:37 PM
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i have both and i don't like the 3.55s then again i tow alot and heavy. so?? on my 97 with 3.55s and a 5 speed at 65 i'm doing about 2000, with the 94 5 speed and 4.10s 65 is about 2300

94.5 F250 Reg Cab 4x4 5 speed 4.10 276000 plus miles

97 F350 Crew Cab LB 4x4 5 speed 3.55 320000 plus miles (parts truck)



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post #9 of 18 Old 01-24-2013, 05:00 PM
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4.10 to 3.55?

What Eric said. I had 355 a five speed and 35 inch tires. Loved the combo. And I hauled quite a bit. The most I hauled with it was four horses(1500pounds each) plus the four horse steel trailer. And hauled a 32 foot tag along camper. Never had a complaint the obs handled it great. Plus the fuel mileage was a plus


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Catlin...

newest
2002 F-350 Lariat Ext Cab
4x4 auto, 139,000miles
with a super-chip tuner

SOLD
2000 F-250 Lariat Ext Cab
4x4 6 spd
Stock

1996
F-250 4x4 7.3L Turbo(Stock
5 speed ZF
3" Body Lift


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Lol what kind of frankenstroke did you buy???

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post #10 of 18 Old 01-24-2013, 06:37 PM
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3.55's and 35" tires are a love/hate relationship.
I can pull close to 20mpg at 70mph on the flats.
I get 12mpg around town unloaded, less than 10 with a trailer. Tall gears, stop and go, and 7400lbs of truck aren't a recipe for good mileage.
I'm going back to 4.10's and 37's if it means anything.

Chrome don't get ya home
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