33" tires 410 vs 456 - Page 4 - JeepForum.com
Reply
 
LinkBack Thread Tools
post #46 of 55 Old 03-30-2012, 07:41 PM
Jerry Bransford
Administrator
 
Jerry Bransford's Avatar
2004 TJ Wrangler 
 
Join Date: Jan 2003
Location: Escondido, California
Posts: 71,815
Quote:
Originally Posted by bigred03 View Post
Are you sure you want to regear? I have the same exact set up as you do and do sand and mud only as well and I think our 3.73's are perfect for it. 4:10's are a waste of money and 4.56's ( I think will be too low) well atleast once you get into the sand and mud, but to each their own right? Good luck!
With more experience you would quickly change your mind about that. Being misgeared is just that... misgeared. In other words, 3.73 is not optimal for 33" tires. 4.10 is barely enough when there is a 5-speed with 4.56 being ideal.

New Jeepers are always afraid of lower ratios but with experience, they soon see why lower gears are one of the first modifications made by experienced Jeepers when installing bigger tires.

Running 33" tires with 3.73 gearing is like starting off in 2nd gear and you lose the use of 5th gear because the RPMs are too low for that size tire. Don't lose sight of the fact the engine is not optimal at all RPMs so you have to gear to keep the engine running at its optimal RPMs or you lose both power and mpg.


When you have a choice, buy American made.
Jerry Bransford is offline  
Sponsored Links
Advertisement
 
post #47 of 55 Old 03-30-2012, 07:50 PM
55willystruck
Registered User
 
Join Date: Dec 2004
Location: East Wenatchee WA
Posts: 2,306
Quote:
Originally Posted by Jerry Bransford View Post
With more experience you would quickly change your mind about that. Being misgeared is just that... misgeared. In other words, 3.73 is not optimal for 33" tires. 4.10 is barely enough when there is a 5-speed with 4.56 being ideal.

New Jeepers are always afraid of lower ratios but with experience, they soon see why lower gears are one of the first modifications made by experienced Jeepers when installing bigger tires.

Running 33" tires with 3.73 gearing is like starting off in 2nd gear and you lose the use of 5th gear because the RPMs are too low for that size tire. Don't lose sight of the fact the engine is not optimal at all RPMs so you have to gear to keep the engine running at its optimal RPMs or you lose both power and mpg.
X2!

Don't fear the gear!!!

I run 4.88 with my 33s on the 6 speed and wouldn't have it any other way...

Best of Luck,

Mike
55willystruck is offline  
post #48 of 55 Old 03-30-2012, 10:28 PM
02ws666
Registered User
2003 TJ Wrangler 
 
Join Date: Jun 2011
Location: the colony
Posts: 379
why the hell Chrysler ever equipped a jeep with 3.07 gears is far beyond me. pisses me off. i have them and i am going up to 456 gears with my 33 inch tires. I can go 70mph in 3rd gear only turning 3k rpms lol. retarded.

what is the optimal RPM range of a 4.0? where should the engine always be?
02ws666 is offline  
 
post #49 of 55 Old 03-30-2012, 10:59 PM
55willystruck
Registered User
 
Join Date: Dec 2004
Location: East Wenatchee WA
Posts: 2,306
Quote:
Originally Posted by 02ws666 View Post
why the hell Chrysler ever equipped a jeep with 3.07 gears is far beyond me. pisses me off. i have them and i am going up to 456 gears with my 33 inch tires. I can go 70mph in 3rd gear only turning 3k rpms lol. retarded.

what is the optimal RPM range of a 4.0? where should the engine always be?
This depends on a few things but typically the 4.0 is at optimum efficiency between 2800-3200 rpms roughly-give or take a few... I have done a ton of testing in mine over the years and found best all around performance in that range consistently. Outside of that and everything suffered. Power, performance, mileage-all go hand in hand and work together. Lots of variables at play but generally speaking, that is a good range to stick with.

Best of Luck,

Mike
55willystruck is offline  
post #50 of 55 Old 03-31-2012, 07:43 AM
Richd1963
Senior Member
 
Richd1963's Avatar
2005 TJ Wrangler 
 
Join Date: Apr 2009
Location: Pasadena
Posts: 739
Quote:
Originally Posted by 55willystruck View Post
X2!

Don't fear the gear!!!

I run 4.88 with my 33s on the 6 speed and wouldn't have it any other way...

Best of Luck,

Mike
Ah-Oh,
I just ordered 4.56 for my 2005 4.0 6 speed running 33's as a daily driver. 60% highway- 40% city. Currently average milage is 12mpg with 3.73, I am hoping to increase milage as well as wheelability. Also installing E lockers with new G2 axles front and rear. Hope I made the right decision.....

Rich G. 2005 Wrangler 4.0 6-Speed.
just4effect 10" single sub, enclosure and amp 4 sale. PM me if interested, local only
Richd1963 is offline  
post #51 of 55 Old 03-31-2012, 07:57 AM
jeepinmichguy_
Registered User
 
jeepinmichguy_'s Avatar
2006 TJ Wrangler 
 
Join Date: Jul 2009
Location: Jacksonville
Posts: 7,441
Quote:
Originally Posted by Richd1963 View Post
Ah-Oh,
I just ordered 4.56 for my 2005 4.0 6 speed running 33's as a daily driver. 60% highway- 40% city. Currently average milage is 12mpg with 3.73, I am hoping to increase milage as well as wheelability. Also installing E lockers with new G2 axles front and rear. Hope I made the right decision.....
You will be fine, I couldn't imagine 4.88's and 33's on that tranny. It already screams in the highway with 4.56 in 6th gear and 1st is almost unusable on the road. I actually think 4.10's would have been optimal for my wife and the amount of highway driving she does compaired to going offroad.

ΜΟΛΩΝ ΛΑΒΕ

Quote:
Originally Posted by TheBoogieman View Post
Jeepinmichguy is a jerk.
jeepinmichguy_ is offline  
post #52 of 55 Old 03-31-2012, 10:05 AM
bigred03
Registered User
 
bigred03's Avatar
2003 TJ Wrangler 
 
Join Date: Feb 2012
Location: san antonio
Posts: 96
Quote:
Originally Posted by jeepinmichguy_

Everything always works fine when you don't know any better.
That's true I'm still a rook I barely got into the jeep world a couple months ago but I will learn everything one day
bigred03 is offline  
post #53 of 55 Old 03-31-2012, 10:09 AM
bigred03
Registered User
 
bigred03's Avatar
2003 TJ Wrangler 
 
Join Date: Feb 2012
Location: san antonio
Posts: 96
Quote:
Originally Posted by Jerry Bransford
With more experience you would quickly change your mind about that. Being misgeared is just that... misgeared. In other words, 3.73 is not optimal for 33" tires. 4.10 is barely enough when there is a 5-speed with 4.56 being ideal.

New Jeepers are always afraid of lower ratios but with experience, they soon see why lower gears are one of the first modifications made by experienced Jeepers when installing bigger tires.

Running 33" tires with 3.73 gearing is like starting off in 2nd gear and you lose the use of 5th gear because the RPMs are too low for that size tire. Don't lose sight of the fact the engine is not optimal at all RPMs so you have to gear to keep the engine running at its optimal RPMs or you lose both power and mpg.
Oops my bad I didn't know he had a five speed, I have a 4 speed auto with overdrive...my bad guys should've read everything before writing anything.
bigred03 is offline  
post #54 of 55 Old 03-31-2012, 12:06 PM
Jerry Bransford
Administrator
 
Jerry Bransford's Avatar
2004 TJ Wrangler 
 
Join Date: Jan 2003
Location: Escondido, California
Posts: 71,815
Quote:
Originally Posted by bigred03 View Post
Oops my bad I didn't know he had a five speed, I have a 4 speed auto with overdrive...my bad guys should've read everything before writing anything.
With the 4-speed automatic, he would need to run 4.88 gearing for 33" tires. Your recommended 3.73 or 4.10 wouldn't even be close to the right ratio for 33" tires for that particular transmission which lowers the RPMs excessively when it shifts into its .69 overdrive.

I bought my '04 Rubicon with the 4-speed automatic used with 4.88 gearing already installed and with my 35" tires, those gears are not low enough, I really need 5.13 or 5.38. On the highway at 65 mph, the engine is lugging... the RPMs are excessively low. I keep having to shut the overdrive off to get the RPMs up enough to make it up even a gentle grade.

When you have a choice, buy American made.
Jerry Bransford is offline  
post #55 of 55 Old 03-31-2012, 03:55 PM
4banged
Registered User
2013 JK Wrangler 
 
Join Date: May 2010
Location: connecticut
Posts: 697
Quote:
Originally Posted by Jerry Bransford

I bought my '04 Rubicon with the 4-speed automatic used with 4.88 gearing already installed and with my 35" tires, those gears are not low enough, I really need 5.13 or 5.38. On the highway at 65 mph, the engine is lugging... the RPMs are excessively low. I keep having to shut the overdrive off to get the RPMs up enough to make it up even a gentle grade.
I hear you Jerry, my 2.4l auto with stock 4.56 gears and 31s is the same way. I can hold 65-70 on flat ground but slight incline/gust of wind and I'm od off. I'm still trying to decide whether I should live with it or possibly go up to a 33 or even 35 tire and drive od off all the time. I do like the current performance around town so I'm worried ill gain hwy driveability and lose non hwy performance. I think most 42rle owners would give their left lug nut for a sensible (.78) od ratio!
4banged is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

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

Password:


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.



Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



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
Trackbacks are Off
Pingbacks are On
Refbacks are On

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