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Open Roads Forum  >  Tow Vehicles

 > Does rear end gear ratio swap require programming?

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WyoTraveler

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Posted: 02/27/12 07:42am Link  |  Print  |  Notify Moderator

Interesting. I have a 2002 F250 6.8L V10 with a 3.73 differential, and a 2008 F250 6.8L V10 with a 4.10 differential. I get about 10% better gas mileage in my 2002 with the 3.73 differential. My 2008 F250 with the 4.10 differential definitely pulls my goose neck stock trailer better. Using a little math I also see there is a 10% difference between the 3.73 and the 4.10 differentials. I see the 10% difference in gas mileage but it would be difficult to say if there was a 10% better towing with the 4.10 differential. It is enough better that I can notice the difference towing when the stock trailer is loaded.

I have also been thinking of changing out the differential in my 2002 F250 to a 4.10 differential.


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JIMNLIN

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Posted: 02/27/12 08:00am Link  |  Print  |  Notify Moderator

Your only gaining approx 250 rpm at 65 mph by going with the 4.10 gears with 31" tall tires.
Dropping to a 29" tall tire will give you about 2800 rpm at 65 mph.

Both numbers are in 1:1 drive or 3rd gear.

If your wanting to tow in OD gear then the 4.56 gear will work. However if your truck is a commuter you won't like the high rpms and reduced mpgs at crusing speeds.


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Posted: 02/27/12 06:03pm Link  |  Print  |  Notify Moderator

Thanks for the heads up whisperide. I thought they all read off the ring gear anymore.


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Posted: 02/27/12 10:07am Link  |  Print  |  Notify Moderator

whisperide wrote:

gmcsmoke wrote:

For a 6.0L a 4.28 would be the best overall gearing. 4.56 would be a tow beast but kill you unloaded.

How did you arrive at this mythical 4.28:1 gear? What tire size were you figuring? And more gear doesn't always hurt average MPG, even if most of your miles are highway and non-hauling.


You're right not sure what I was thinking should have said 4.30.

APT

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Posted: 02/27/12 08:12am Link  |  Print  |  Notify Moderator

For 2WD, may be worth $500. Not worth $1500+ for a 4WD for both axles. IF you want to change, go to 4.56 if you want to feel significantly more power.


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WyoTraveler

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Posted: 02/27/12 08:19am Link  |  Print  |  Notify Moderator

I just checked it out with a mechanic. Requires both axles since it is 4WD. Not worth the cost.

SoCalDesertRider

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Posted: 02/27/12 07:55pm Link  |  Print  |  Notify Moderator

Jarlaxle wrote:

ARe 4.56 gears even AVAILABLE for the front?
They probably are. It's a GM 1500 4wd front axle. Plenty of lifted 1500 4wd pickups out there with monster tires on them. Has to be a few aftermarket gear manufacturers making 4.56's for that axle.


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smkettner

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Posted: 02/27/12 06:39pm Link  |  Print  |  Notify Moderator

Sometimes the front is more complex. Although $500 does seem low.

+1, go 4.56 or don't bother. I would add Trutrac limited slip to the front while you are in there same to the rear or a locker. I went Trutrac on both.

Mine needed a programmer but that tells you nothing for your vehicle.


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Jarlaxle

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Posted: 02/27/12 07:01pm Link  |  Print  |  Notify Moderator

ARe 4.56 gears even AVAILABLE for the front?


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NorthernLimits

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Posted: 02/27/12 06:11pm Link  |  Print  |  Notify Moderator

APT wrote:

For 2WD, may be worth $500. Not worth $1500+ for a 4WD for both axles. IF you want to change, go to 4.56 if you want to feel significantly more power.


500 for one axle but 3 times as much for 2 axles? Remind me not to go to your shop.





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