Determinung my Gear Ratio. - Ford Powerstroke Diesel Forum
 
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post #1 of 10 Old 08-18-2011, 09:31 AM Thread Starter
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Determinung my Gear Ratio.

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.
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post #2 of 10 Old 08-18-2011, 09:32 AM
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Originally Posted by Turb0 View Post
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

Jason

First rig: e99 F250 CCSB 4x4 auto, white, 388k miles: traded in
Then: 02 F350 RCLB SRW 4x4 zf6, silver, 201k miles, THREW A ROD : traded to Jake
Now: 96 F350 CCLB DRW 4x2 auto, red and silver/grey, 266k miles: rusty but trusty
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post #3 of 10 Old 08-18-2011, 10:19 AM
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There is a tag on the rearend.

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post #4 of 10 Old 08-18-2011, 10:26 AM
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Originally Posted by Turb0 View Post
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
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post #5 of 10 Old 08-18-2011, 12:48 PM Thread Starter
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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.
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post #6 of 10 Old 08-18-2011, 01:39 PM
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Originally Posted by Turb0 View Post
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

Jason

First rig: e99 F250 CCSB 4x4 auto, white, 388k miles: traded in
Then: 02 F350 RCLB SRW 4x4 zf6, silver, 201k miles, THREW A ROD : traded to Jake
Now: 96 F350 CCLB DRW 4x2 auto, red and silver/grey, 266k miles: rusty but trusty
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post #7 of 10 Old 08-18-2011, 01:48 PM
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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.

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post #8 of 10 Old 08-18-2011, 01:51 PM
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I could use those 4.30s too now that I put the 22.5s on.

Both our trucks are 05 DRWs

2005 F350 XLT 6.0 PSD 4x4 AUTO
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post #9 of 10 Old 08-18-2011, 03:41 PM
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Quote:
Originally Posted by Turb0 View Post
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


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post #10 of 10 Old 08-18-2011, 03:53 PM
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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.
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