What Gear Do I have?
Thread Starter
|
New User
Joined: Mar 2007
Posts: 13
Likes: 0
What Gear Do I have?
I have a 2002 F250 super duty crew cab short box with the V-10 and automatic trans. How do I find out what the gear ratio is?
I don't tow alot. I currently am running 265/75/16 tires. I am looking at replacing the tires and may want to go to 285/75/16. What is the best gear to run for this size tire?
This truck has 150k and runs like a clock. Mileage is 11-12 mpg. I am hoping that a larger tire might lower the rpms and pickup 1-2 mpg.
What is your thought?
I don't tow alot. I currently am running 265/75/16 tires. I am looking at replacing the tires and may want to go to 285/75/16. What is the best gear to run for this size tire?
This truck has 150k and runs like a clock. Mileage is 11-12 mpg. I am hoping that a larger tire might lower the rpms and pickup 1-2 mpg.
What is your thought?
Lead Driver
Joined: Sep 2003
Posts: 5,844
Likes: 6
From: Albuquerque
To find the gears...just look at your VIN door sticker and look for the code under Axle.
Here are the codes:
Axle Type
31 — 3.73 non-limited slip, F-250/Excursion
C1 — 3.73 limited slip, F-250/Excursion
32 — 4.10 non-limited slip, F-250
C2 — 4.10 limited slip, F-250/Excursion
33 — 4.30 non-limited slip, F-250
C3 — 4.30 limited slip, F-250/Excursion
36 — 4.56 non-limited slip, F-250
C6 — 4.56 limited slip, F-250
As far as tire size is concerned...IMO...if you are happy with 11-12mpg, then leave it alone. The only thing adding a larger tire will do is use more fuel. The larger size tire adds weight and rolling resistance.
Since the V10 loves to rev in the upper RPM range...most post that 4.30 gears are the best all-around gears with the stock OEM tires. But with the LT285...and 3.73...you could get away with it if you go with 4.30 gears. The gear swap (if 4x4) will cost about $1500-$2000.
Hope that helps...
biz
Here are the codes:
Axle Type
31 — 3.73 non-limited slip, F-250/Excursion
C1 — 3.73 limited slip, F-250/Excursion
32 — 4.10 non-limited slip, F-250
C2 — 4.10 limited slip, F-250/Excursion
33 — 4.30 non-limited slip, F-250
C3 — 4.30 limited slip, F-250/Excursion
36 — 4.56 non-limited slip, F-250
C6 — 4.56 limited slip, F-250
As far as tire size is concerned...IMO...if you are happy with 11-12mpg, then leave it alone. The only thing adding a larger tire will do is use more fuel. The larger size tire adds weight and rolling resistance.
Since the V10 loves to rev in the upper RPM range...most post that 4.30 gears are the best all-around gears with the stock OEM tires. But with the LT285...and 3.73...you could get away with it if you go with 4.30 gears. The gear swap (if 4x4) will cost about $1500-$2000.
Hope that helps...
biz
Thread
Thread Starter
Forum
Replies
Last Post
SuperDutyScaler
1999 - 2016 Super Duty
15
Apr 10, 2012 09:14 AM
