Rear End?

[TLowery06]

What rear end and gears are in an '05 350 dually. My fuel mileage is about 13.5-14 so i was wondering if getting numerically lower gears would help improve fuel mileage?

[bigcountrysg]

You probablly have 4.10:1 gear ratio which is commonly referred to as 4.10's.

If you have a 4wd truck the amount of money spent on fuel would have to be quite large in order to recoup from the swap.

I say this because your looking at about 400-500 per gear set then another 500 for the installation. So on a 4wd drive truck it would cost you approximately 1500 dollars to swap out gears.

In a 2wd drive truck it would be about 1,000 dollars.

If you tow with your truck often your better off to keep the 4.10's gears you currently have. As you get better acceleration with the 4.10's.

[quequeg37]

i agree. for the application 4.10 are probably the best all around. i think all other sizes have been tried. this gear seems to work out best overall. setting up new gears are costly and can be trouble if not set up properly.

[TurboDave]

It's actually cheaper to get like a DPtuner with a couple tunes such as a tow and a economy tune...with that only you'll see fuel economy and power both go up...it also helps to have intake and exhaust upgrades to aid even more with the chip