Low RPM vibration? - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > General Jeep Discussions > General Jeep Discussion

Join Wrangler Forum Today

Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 01-05-2013, 04:17 PM   #1
Join Date: Nov 2012
Location: In The Hot South West AZ, and cold Alaska
Posts: 1,017
Low RPM vibration?

I have a 4.0 with automatic trans and 3:73 ration. tires are 31/10.5/15 inch

I have a Tj 2 inch lift and I do not get any vibration under acceleration, or de- acceleration, in fact it is very smooth.
Now for my question, when my trans shifts into overdrive at about 45 mph my engine RPM drops to about 13 to 1400 RPM sounds like it is lugging and I get a vibration from the engine that radiates back through the drive train and I can feel it in the floor. As soon as I hit the OD button the vibration is gone. What is causing this, is the engine out of balance, or is it normal?

Miser is offline   Quote Quick Reply
Old 01-05-2013, 09:22 PM   #2
Join Date: Nov 2012
Location: In The Hot South West AZ, and cold Alaska
Posts: 1,017
Can't any of Jeep guru's help this old Miser out with this issue???

Miser is offline   Quote Quick Reply
Old 01-06-2013, 01:00 PM   #3
Old Dogger's Avatar
Join Date: May 2012
Location: Phoenix, Rattlesnake Country
Posts: 3,437
This is normal. The 4.0 engine does not like to be lugged and it sends off a harmonic vibration. Just keep your RPM above 1500 and you should be O.K.
Old Dogger is offline   Quote Quick Reply

Quick Reply

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.
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:


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

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 Off
Refbacks are Off

» Featured Product

All times are GMT -5. The time now is 06:03 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