285s or 315s with 4:10 gears? - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Wrangler Forums > JK Wrangler Technical Forum > 285s or 315s with 4:10 gears?

ROCK BOTTOM prices on LIFT KITS at Rockridge4wd!! WANT TO Alloy usa heavy duty ball joint kitsWe have FLASHLIGHTS! Great for your Emergency bag!

Reply
Unread 04-17-2014, 09:46 AM   #1
KeepItMoist
Registered User
 
Join Date: Aug 2013
Posts: 22
285s or 315s with 4:10 gears?

Hello,

I currently have a 2008 JKU Rubicon (4:10 gears) with a MANUAL transmission. I am looking to get new tires and can't decide between 285 and 315s. My main concern with getting 315s is making it under powered, as the 3.8 doesnt have much balls to begin with. Will my 4:10 gears with manual tranny be good with 315s or will it be to sluggish and underpowered?

Thanks!

KeepItMoist is offline   Reply With Quote Quick reply to this message
Unread 04-17-2014, 09:52 AM   #2
SLADE
Registered User
2004 TJ Wrangler 
 
Join Date: Jul 2010
Location: 26537
Posts: 1,975
There's a big gap between a 285 and a 315 with plenty of sizes in between.
__________________
2014 Wrangler JKU
2013 Wrangler JK
2004 Wrangler TJ on LEAFS
2001 Dodge Ram 2500
SLADE is online now   Reply With Quote Quick reply to this message
Unread 04-17-2014, 09:56 AM   #3
KeepItMoist
Registered User
 
Join Date: Aug 2013
Posts: 22
Quote:
Originally Posted by SLADE View Post
There's a big gap between a 285 and a 315 with plenty of sizes in between.
Yes I know that. Ill change the question then... are 315s too much for 4:10 gears and manual tranny? And I dont want just bearable performance. I want good performance both on amd off road. And no im not regearing.
KeepItMoist is offline   Reply With Quote Quick reply to this message
Unread 04-17-2014, 10:04 AM   #4
Adam556
Registered User
 
Join Date: Jul 2013
Location: Demotte, IN
Posts: 8
Be more specific.....315 is the width....
__________________
2006 WK Limited 4.7 4x4 - Wife's
Looking for a Jeep for me
Adam556 is offline   Reply With Quote Quick reply to this message
Unread 04-17-2014, 10:19 AM   #5
KeepItMoist
Registered User
 
Join Date: Aug 2013
Posts: 22
Quote:
Originally Posted by Adam556 View Post
Be more specific.....315 is the width....
From my understanding it is mostly the tire width that causes a decrease in performance. But ill just say 315 70 17s.
KeepItMoist is offline   Reply With Quote Quick reply to this message
Unread 04-17-2014, 10:20 AM   #6
KeepItMoist
Registered User
 
Join Date: Aug 2013
Posts: 22
Aka 34.4s aka 35s
KeepItMoist is offline   Reply With Quote Quick reply to this message
Unread 04-17-2014, 10:27 AM   #7
SLADE
Registered User
2004 TJ Wrangler 
 
Join Date: Jul 2010
Location: 26537
Posts: 1,975
Quote:
Originally Posted by KeepItMoist View Post
Yes I know that. Ill change the question then... are 315s too much for 4:10 gears and manual tranny? And I dont want just bearable performance. I want good performance both on amd off road. And no im not regearing.

Yes, 35's are too much for the 3.8 and 4.10 gears.
__________________
2014 Wrangler JKU
2013 Wrangler JK
2004 Wrangler TJ on LEAFS
2001 Dodge Ram 2500
SLADE is online now   Reply With Quote Quick reply to this message
Unread 04-17-2014, 10:29 AM   #8
ncb
Registered User
 
Join Date: Mar 2009
Location: Your mom's house, Colorado
Posts: 4,708
It will be a slug with 315s. I have a 2009 JK unlimited Rubicon (manual transmission) and it was marginal with 285s (33"). If you go with 35" tires you'll want to change to 4.88 or 5.13. Changing gears was the best mod I've done.
ncb is offline   Reply With Quote Quick reply to this message
Unread 04-17-2014, 10:30 AM   #9
KeepItMoist
Registered User
 
Join Date: Aug 2013
Posts: 22
Quote:
Originally Posted by SLADE View Post

Yes, 35's are too much for the 3.8 and 4.10 gears.
For both manual and auto?
KeepItMoist is offline   Reply With Quote Quick reply to this message
Unread 04-17-2014, 10:41 AM   #10
KeepItMoist
Registered User
 
Join Date: Aug 2013
Posts: 22
Quote:
Originally Posted by ncb View Post
It will be a slug with 315s. I have a 2009 JK unlimited Rubicon (manual transmission) and it was marginal with 285s (33"). If you go with 35" tires you'll want to change to 4.88 or 5.13. Changing gears was the best mod I've done.
Yeah I have a feeling you're right. Does anyone know what the best tire size would be for a my 08' JKU Rubi with manual tranny? To get maximum performance.
KeepItMoist is offline   Reply With Quote Quick reply to this message
Unread 04-17-2014, 11:01 AM   #11
Stag
Registered User
2008 JK Wrangler 
 
Join Date: Jan 2011
Location: Poquoson, VA
Posts: 124
I have a 2 dr rubicon (4:10s) with manual transmission. I'm runninig 315/75R/16 without any problems.
Stag is offline   Reply With Quote Quick reply to this message
Unread 04-17-2014, 01:18 PM   #12
ncb
Registered User
 
Join Date: Mar 2009
Location: Your mom's house, Colorado
Posts: 4,708
Quote:
Originally Posted by KeepItMoist
Yeah I have a feeling you're right. Does anyone know what the best tire size would be for a my 08' JKU Rubi with manual tranny? To get maximum performance.
I thought it was best with the 255/75/17 and ok with 285/70/17 when I had 4.10 (manual transmission and 3.8). It's all subjective. Some will say 3.21 and 35s is perfect. Any reason you're against gearing?
ncb is offline   Reply With Quote Quick reply to this message
Unread 04-17-2014, 01:36 PM   #13
KeepItMoist
Registered User
 
Join Date: Aug 2013
Posts: 22
Quote:
Originally Posted by ncb View Post

I thought it was best with the 255/75/17 and ok with 285/70/17 when I had 4.10 (manual transmission and 3.8). It's all subjective. Some will say 3.21 and 35s is perfect. Any reason you're against gearing?
Don't really feel like spending $1200.
KeepItMoist is offline   Reply With Quote Quick reply to this message
Unread 04-17-2014, 08:01 PM   #14
taoshum
Registered User
2008 JK Wrangler 
 
Join Date: May 2009
Location: Taos, New Mexico
Posts: 928
Quote:
Originally Posted by KeepItMoist View Post
Yeah I have a feeling you're right. Does anyone know what the best tire size would be for a my 08' JKU Rubi with manual tranny? To get maximum performance.

You can get KM2's at 285/75-17, about 34" Diameter. not as wide but...
__________________
Geezer from NM
"Wisdom isn't cheap; we pay for it with pain
taoshum is offline   Reply With Quote Quick reply to this message
Unread 04-17-2014, 08:26 PM   #15
sinawalli
Registered User
2013 JK Wrangler 
 
Join Date: Sep 2013
Location: Onoway, Alberta
Posts: 65
Toyo MT's and Nitto both make 285/75/17's. It's a great size! A bit of height, but not real wide.
sinawalli is offline   Reply With Quote Quick reply to this message
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.
Note: All free e-mails have been banned due to mis-use. (Yahoo, Gmail, Hotmail, etc.)
Don't have a non-free e-mail address? Click here for a solution: Manual Account Creation
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.


Thread Tools






Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.