JK-Forum.com - The top destination for Jeep JK and JL Wrangler news, rumors, and discussion

Notices
Stock JK Tech Bulletin board forum regarding issues with OE (original equipment) components of the Jeep JK Wrangler (Rubicon, Sahara, Unlimited and X) such as factory suspension parts, engine, transmission, body parts, interior fixtures and the on-board computer.

Engine RPMs @ 70 mph for 2014 JKUR with 4:10s

Thread Tools
 
Old 05-18-2014, 10:46 AM
  #11  
JK Junkie
 
Tooadvanced's Avatar
 
Join Date: Feb 2013
Location: West Richland Washington
Posts: 2,013
Likes: 0
Received 0 Likes on 0 Posts
Default
Originally Posted by ERT

That's what I was afraid of. I wanted the Rubicon for all its extra off-road features. I thought 4:10s were part of the Rubicon package. My fault for not doing the research.

Thank you for your input.
Well I can say my Sahara with 3.73s and 32s would turn about 2250 at 70 so at 2500 I'm thinking you got 4.10s. IMHO
Tooadvanced is offline  
Reply Like
Old 05-18-2014, 10:48 AM
  #12  
JK Junkie
 
Tooadvanced's Avatar
 
Join Date: Feb 2013
Location: West Richland Washington
Posts: 2,013
Likes: 0
Received 0 Likes on 0 Posts
Default
Originally Posted by Tooadvanced

Well I can say my Sahara with 3.73s and 32s would turn about 2250 at 70 so at 2500 I'm thinking you got 4.10s. IMHO
Also if I take the difference between the 4.10 and 3.73 and multiply by 2250 it comes to 2450ish
Tooadvanced is offline  
Reply Like
Old 05-18-2014, 01:53 PM
  #13  
ERT
JK Newbie
Thread Starter
 
ERT's Avatar
 
Join Date: May 2014
Location: Florida
Posts: 15
Likes: 0
Received 0 Likes on 0 Posts
Default
Click image for larger version Name: 20140510_094455.jpg Views: 201 Size: 47.7 KB ID: 553866

My dashboard @ 70mph.
ERT is offline  
Reply Like
Old 05-18-2014, 05:30 PM
  #14  
JK Enthusiast
 
AR JK RUBI's Avatar
 
Join Date: Mar 2014
Location: Batesville AR
Posts: 160
Likes: 0
Received 0 Likes on 0 Posts
Default
Originally Posted by ERT
<img src="https://www.jk-forum.com/forums/attachment.php?attachmentid=553866"/> My dashboard @ 70mph.
. I have a 13 rubicon stock tires and manual Trans and mine does have the 4.10's and your rpm looks just like mine at that speed
AR JK RUBI is offline  
Reply Like
Old 05-18-2014, 11:21 PM
  #15  
ERT
JK Newbie
Thread Starter
 
ERT's Avatar
 
Join Date: May 2014
Location: Florida
Posts: 15
Likes: 0
Received 0 Likes on 0 Posts
Default
Originally Posted by Tooadvanced
Well I can say my Sahara with 3.73s and 32s would turn about 2250 at 70 so at 2500 I'm thinking you got 4.10s. IMHO

Maybe I did get 4:10s. It was ordered with the max tow package. I posted a picture of my dashboard @ 70mph. In the picture you can see the tach @ 2500rpms.

Thank you for your input.
ERT is offline  
Reply Like
Old 05-18-2014, 11:29 PM
  #16  
ERT
JK Newbie
Thread Starter
 
ERT's Avatar
 
Join Date: May 2014
Location: Florida
Posts: 15
Likes: 0
Received 0 Likes on 0 Posts
Default
Originally Posted by AR JK RUBI
. I have a 13 rubicon stock tires and manual Trans and mine does have the 4.10's and your rpm looks just like mine at that speed
Now that's interesting. If the manual and automatic with 4:10s are at the same rpm, why is jeep putting 3:73s with the automatic?
ERT is offline  
Reply Like
Old 05-18-2014, 11:36 PM
  #17  
JK Freak
 
RedRockJeeper's Avatar
 
Join Date: Mar 2012
Location: Sacramento, People's Republic of California
Posts: 516
Likes: 0
Received 0 Likes on 0 Posts
Default
Originally Posted by ERT
Now that's interesting. If the manual and automatic with 4:10s are at the same rpm, why is jeep putting 3:73s with the automatic?
Well that's probably because auto by design get worse gas mileage than a manual. So the 3:73's maybe an attempt to make up for that.
RedRockJeeper is offline  
Reply Like
Old 05-21-2014, 05:08 AM
  #18  
JK Newbie
 
Havoc40's Avatar
 
Join Date: Feb 2014
Location: Grosse Ile, Michigan
Posts: 78
Likes: 0
Received 0 Likes on 0 Posts
Default
Here's what mine looks like @ 70 MPH. A little over 2600 RPM, on a flat straight road.

Havoc40 is offline  
Reply Like
Old 05-21-2014, 06:05 AM
  #19  
JK Junkie
 
Jeepstin12's Avatar
 
Join Date: Mar 2012
Location: Denver, CO
Posts: 2,482
Likes: 0
Received 1 Like on 1 Post
Default
Ok, I just checked mine again on the highway. My tach rests at 2450 @ 70mph and at 2550 at 75mph. 4:10 w/ 35's.
Jeepstin12 is offline  
Reply Like
Old 05-21-2014, 07:04 AM
  #20  
JK Jedi Master
 
ronjenx's Avatar
 
Join Date: Feb 2008
Location: Maine
Posts: 12,880
Likes: 0
Received 171 Likes on 146 Posts
Default
Originally Posted by ERT
Maybe I did get 4:10s. It was ordered with the max tow package. I posted a picture of my dashboard @ 70mph. In the picture you can see the tach @ 2500rpms.

Thank you for your input.
It sounds like you are unsure of the gear ratio on your JK.

If you want to know for sure, regardless of what's on the sticker or build sheet, do this:


Jack one front tire off the ground.
Put a chalk mark on the tire and the drive shaft.
Rotate the tire by hand 2 complete revolutions while counting the drive shaft turns. The number will be your gear ratio.
A little less than 3 and 1/4 turns will be 3.21 gears.
About 3 and 3/4 turns will be 3.73 gears.
A little over 4 turns will be 4.10 gears.
ronjenx is offline  
Reply Like



Advanced Search
Quick Reply: Engine RPMs @ 70 mph for 2014 JKUR with 4:10s


Reply Closed Thread Share

All times are GMT -8. The time now is 08:24 PM.