Gear ratio change with 35" tires? HELP

[Rosspbig]

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).

[suban]

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

[Rosspbig]

Originally Posted by suban

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......

[Blue Turd]

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.

[Rosspbig]

Originally Posted by Blue Turd

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?

[suban]

Originally Posted by Rosspbig

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

[ShirtaDay.com]

Subscribed out of curiosity. 35's go on today, but not planning to swap gears.

[Rosspbig]

Originally Posted by suban

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?

[Blue Turd]

Not 100% sure but think most trucks by end of 2008 had 3:55's. Lets see what the 2009 guys have to say.

[99PSD-White]

I run 37s with stock 3.73 gears on my cclb 7.3L with no problems.