regearing? - Off-Road Forums & Discussion Groups
Jeep-Short Wheelbase All discussion of short wheelbase Jeeps: CJ, TJ, YJ and JK

LinkBack Thread Tools Display Modes
post #1 of (permalink) Old 02-06-2007, 05:25 PM
B luv
Posts: n/a

Hello, I'm new to the sight so just wanted to introduce myself first. Live in sw colorado, have stock 86 cj7 that i am about to put a 4 inch pro comp lift on, with 2 inch body lift. I have 35 inch tires on standby. My question is how much will the larger tires affect the daily driving operation of the vehicle. Do i need to regear it so that my actuall speed is really what my speedometer reads? I guess I'm just confused about all this talk about re gearing and what it's for. I understand wanting to crawl in my low range, but how does it affect my regualr high range? I don't mean to sound ignorant, i'm just trying to learn, Thank you in advance, Brian.

Brian Collabolletta
Attached Images
File Type: jpg 1556198-2ndanniversary031_edited.JPG (152.6 KB, 4 views)
Sponsored Links
post #2 of (permalink) Old 02-06-2007, 05:37 PM
Keyboard Implanted
thorjeep's Avatar
Join Date: Jan 2000
Location: In the process of finding it
Posts: 2,561
Thanks: 10
Thanked 1 Time in 1 Post
Re: regearing?

Sorry Man, but search, this has been covered many times before, especially with 35s! If you still need help, tell us what tranny, transfer case, and gears on your axles you already have (covered too) we can then help you better.
thorjeep is offline  
post #3 of (permalink) Old 02-06-2007, 06:11 PM
I Might Just Know What I'm Talking About
JeepDawg's Avatar
Join Date: Dec 2006
Location: S. CA
Posts: 1,503
Thanks: 0
Thanked 0 Times in 0 Posts
Re: regearing?

Welcome.... are your kidneys? That pro-comp lift is most likely beating you up pretty good.

As Thor a will get much more info that way....

Bottom line...35"'s? there is a lot more involved than just gears....

BTW...loose the body does nothing for ground clearance....
JeepDawg is offline  
Sponsored Links
post #4 of (permalink) Old 02-06-2007, 06:54 PM
Join Date: Nov 2000
Posts: 2,687
Thanks: 0
Thanked 0 Times in 0 Posts
Re: regearing?

As you increase the diameter of the tire, it increases the leverage against drivetrain works to propel the vehicle. Imagine if I took away your first gear, when you tried to pull away from a stop you would find the vehicle resisted it more than ever. You would have to give it more gas, slip the clutch more, and it would pull away much slower. That is what bigger tires do to you. Every gear will now seem higher, and rpms will be lower than they were before at a given speed in that gear. 5th gear, if you have it, may be unusable. Now if you compensate by putting in a higher numerical gear set in both axles you can compensate for the loss in torque at the wheel. This will fix that problem, but you still have more torque on the axles themselves, and they will break easier.

As for speedometer compensation, that is a small gear in the transfer case or transmission that spins the speedometer shaft. If you put on different size tires, such as larger tires, your wheels turn less revolutions per mile, and you need a different gear to compensate to make the speedo accurate. That is cheap and easy to do. The regearing of the axles is more involved and expensive, but worth it.
TiminMb is offline  
Sponsored Links

Quick Reply

Register Now

In order to be able to post messages on the Off-Road Forums & Discussion Groups forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Posting Rules  
You may not post new threads
You may not 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
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome