Gear ratio change with 35" tires? HELP - Ford Powerstroke Diesel Forum

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post #1 of 30 Old 01-03-2011, 07:04 PM Thread Starter
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Gear ratio change with 35" tires? HELP

Can anyone tell me if I will need to swap out gears when I put 35s on my truck? I am guessing I will need to, in order to get stock drivability, but which gears do I need? (BTW the truck is listed in my sig and is a XLT with stock 17" wheels and tires).

2010 Black F250 Diesel 4x4 CCSB
2007 Black Z06

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post #2 of 30 Old 01-03-2011, 07:12 PM
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when they come from the factory with 275/65-20's that equals 34.2''

so 35's arent much different. even if you have 3.55 gears you should be fine

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post #3 of 30 Old 01-03-2011, 08:30 PM Thread Starter
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when they come from the factory with 275/65-20's that equals 34.2''

so 35's arent much different. even if you have 3.55 gears you should be fine
That is true but mine came from the factory with the 17 inch wheels and the 265/70/17s so I am thinking I have 3.55 gears right......

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post #4 of 30 Old 01-04-2011, 08:36 AM
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What is the build date on your truck? Job 1 Around March of 07 had 3:73's.. Think they went 3:55's on Job 2 to help with gas mileage. Someone else that knows hopefully can confirm.
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post #5 of 30 Old 01-04-2011, 08:49 AM Thread Starter
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What is the build date on your truck? Job 1 Around March of 07 had 3:73's.. Think they went 3:55's on Job 2 to help with gas mileage. Someone else that knows hopefully can confirm.
I think there is a way to find out by looking at the label in your door jam....can anyone confirm?

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post #6 of 30 Old 01-04-2011, 09:24 AM
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I think there is a way to find out by looking at the label in your door jam....can anyone confirm?
look in drivers door and read the build date then report back

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post #7 of 30 Old 01-04-2011, 09:25 AM
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Subscribed out of curiosity. 35's go on today, but not planning to swap gears.

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post #8 of 30 Old 01-04-2011, 10:57 AM Thread Starter
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look in drivers door and read the build date then report back
Ok looks like the build date is 12/09. Does that mean I have 3.55s?

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post #9 of 30 Old 01-04-2011, 11:05 AM
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Not 100% sure but think most trucks by end of 2008 had 3:55's. Lets see what the 2009 guys have to say.
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post #10 of 30 Old 01-04-2011, 11:09 AM
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I run 37s with stock 3.73 gears on my cclb 7.3L with no problems.

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