Determinung my Gear Ratio.

[Turb0]

2005 F-350 6.0 DRW Lariat 4X4 FX4. Im really trying to find out what gear ratio i have. Driving on the Highway at 70mph im at around 2300 rpm give or take. The is no owners manual. How do i get this info? Thanks in advance.

[Buffalo444]

Originally Posted by Turb0

2005 F-350 6.0 DRW Lariat 4X4 FX4. Im really trying to find out what gear ratio i have. Driving on the Highway at 70mph im at around 2300 rpm give or take. The is no owners manual. How do i get this info? Thanks in advance.

sounds like 4.10's. you can always take your axle code off of the door jam and run it

[Galaxie]

There is a tag on the rearend.

[Firstdiesel6.0]

Originally Posted by Turb0

2005 F-350 6.0 DRW Lariat 4X4 FX4. Im really trying to find out what gear ratio i have. Driving on the Highway at 70mph im at around 2300 rpm give or take. The is no owners manual. How do i get this info? Thanks in advance.

If you look on the dif cover there should be a small tag on one of the bolts and on it you will find the ratio. Both axles will/should have a tag

[Turb0]

Just looked at the tag on the rear and it says 4.30. DAMN, i should have looked at it when i bought the truck, considering its my daily driver doing mostly commutes to work and back. I will only be towing a car trailer once in a blue moon. So what tire size should i shop for to lower the ratio down some? It has 235/80/17 right now and they only have like 30% left.

[Buffalo444]

Originally Posted by Turb0

Just looked at the tag on the rear and it says 4.30. DAMN, i should have looked at it when i bought the truck, considering its my daily driver doing mostly commutes to work and back. I will only be towing a car trailer once in a blue moon. So what tire size should i shop for to lower the ratio down some? It has 235/80/17 right now and they only have like 30% left.

Wanna go to SRW? I'll swap you axles

[Buzzyt517]

Originally Posted by Buffalo444

Wanna go to SRW? I'll swap you axles

I'll swap for the 4:30's. I need bigger gears. Buffalo you beat me to it.

[go_n_low]

I could use those 4.30s too now that I put the 22.5s on.

Both our trucks are 05 DRWs

[mustangman02232]

Originally Posted by Turb0

Just looked at the tag on the rear and it says 4.30. DAMN, i should have looked at it when i bought the truck, considering its my daily driver doing mostly commutes to work and back. I will only be towing a car trailer once in a blue moon. So what tire size should i shop for to lower the ratio down some? It has 235/80/17 right now and they only have like 30% left.

why did you need a dually then for a DD

[colo_dually]

That does sound about what I have doing 70 mph, and I have the 4.30's.

That tire size isn't what I have though, mine are 245/75R17E. Going a little taller might help, but if you do a gear swap you'll never get your money out of it.

This truck is my daily driver, there is a few things you can do to help mileage. Tuner, exhaust, and keep your foot out of it.