Jeep Wrangler Forum - Reply to Topic
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ Tech Forum > rubi gears????

Join Wrangler Forum Today


Thread: rubi gears???? Reply to Thread
Title:
  
Message:
Post Icons
You may choose an icon for your message from the following list:
 

Register Now

In order to be able to post messages on the Jeep Wrangler Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Additional Options
Miscellaneous Options

Topic Review (Newest First)
11-26-2010 08:29 PM
rbloodhound I have a 05 LJ with 4.88 and 35's. it seems great. If I had a Dana 44 in the front I would go with 5.13.
11-26-2010 08:21 PM
AOR It's all good. Just trying to provide information and experience. Maybe you could find someone local that would allow you to drive their rig before you shell out the cash. At least you would know where you want to be.

Let me know if you want help with a purchase.

Allen
11-26-2010 08:12 PM
badrubi03 well. with the 35s and the factory 4.10 now. anything under 65 and wind not blowin 100 i can keep it in OD with no prob. just i think gettin on the interstate will start to jump out some, and just wanna stop the motor from straining quite so much from tryin to turn them tires ya know?
11-26-2010 07:12 PM
AOR Courtesy of Car Craft. You can figure out your final RPM by multiplying the results from the math below times your overdrive gear reduction percentage.

Example:

70 X 4.88 X 336 ÷ 35 = 3279 X .8 (OD ratio)= 2,623 RPM roughly.


MPH = (RPM X Tire Diameter) ÷ (Gear Ratio X 336)
Example:
MPH = (3,000 X 26) ÷ (4.10 X 336)
MPH = 78,000 ÷ 1,377.6
MPH = 56.6

RPM = MPH X Gear Ratio X 336 ÷ Tire Diameter
Example:
RPM = 70 X 4.10 X 336 ÷ 26
RPM = 3,709

Gear Ratio = (RPM X Tire Diameter) ÷ (MPH X 336)
Example:
Gear Ratio = (3,000 X 26) ÷ (70 X 336)
Gear Ratio = 78,000 ÷ 23,520
Gear Ratio = 3.31:1

Tire Diameter =MPH X Gear Ratio X 336 ÷ RPM
Example:
Tire Diameter = 65 X 3.31 X 336 ÷ 2,700
Tire Diameter = 26.8 inches

Effective Gear Ratio = (Old Tire Diameter ÷ New Tire Diameter) X Gear Ratio
Example:
Effective Gear Ratio = (26 ÷ 28) X 3.55
Effective Gear Ratio = 3.29:1
11-26-2010 06:20 PM
J10
Quote:
Originally Posted by AOR View Post
Don't forget they are assuming a 1:1 final drive ratio with these types of charts.
Cant forget what I didnt know
I should have thought about that though, there must be some formula associated with the chart then?
11-26-2010 05:58 PM
AOR Don't forget they are assuming a 1:1 final drive ratio with these types of charts.
11-26-2010 05:33 PM
J10 Heres a chart for ref
11-26-2010 05:24 PM
AOR Go with 4.88s. I had 37s and 4.88 in my '06 LJ and I was constantly shifting up and down with the auto. Had I been on 35s the 4.88s would have been perfect. When you
re ready to purchase, shoot me a PM or check out my current promotions in the vendors section.

Have fun with the build.

Allen
11-26-2010 04:38 PM
badrubi03
rubi gears????

im gonna get gears coome first of the year. u know the rubi comes with 4.10s from the factory. i got 35s now and plan on stayin 35s for street driving, but will run 36 to 37s when offrading. so mainly for highway, decent mileage(i know its a jeep) and to get my overdrive back after 70 or 65 n a windy day, should i go with 4.88 or 4.56? just dont want my rpms up around 3 grand at cruisin speeds ya know? just tryin to get my stuff straight for when i order them.

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


All times are GMT -5. The time now is 10:28 PM.



Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC