Gear Ratio Causing Problems? - Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ Tech Forum

Join Wrangler Forum Today

Thread Tools

Please support our sponsors and let them know you heard about them on
Old 04-19-2010, 03:38 AM
Thread Starter
Join Date: Apr 2010
Posts: 1
RoyalCask is on a distinguished road
Gear Ratio Causing Problems?

2000 Jeep Wrangler 4.0L I6, Auto.

I purchased a jeep for a steal about a month ago, and the previous owner had upgraded a lot of things on this jeep. Two of the many upgrades are 33" Tires, and a 4" lift. I have been getting terrible gas mileage, and have a hard time getting over 70MPH, god forbid I am on any incline. So, I slid under and took a gander at the gear ratio it had and it is 3.07. What gear ratio should I have with my Jeep, and these upgrades? Would the gear ratio be causing the very low MPG's, and trouble gaining speed?

Also, every so often my oil gauge will drop almost instantly from 80 to 0, and then slowly start going up, and then drop back to 0 again. After a little bit it will make it's way back to a steady 80. Any ideas?

Also, also, will I have any problems with this setup having the stock yoke and drive shaft?

My Jeep (Sorry for the bad pictures, will post better ones later.):

RoyalCask is offline   Quote
Old 04-19-2010, 03:59 AM   #2
kpool's Avatar
Join Date: Feb 2010
Location: gainesville /ga/30506
Posts: 339
kpool is on a distinguished road
Send a message via AIM to kpool
your speedo is off with the 33'' tires, your actually going faster and further that what your speedometer is showing

kpool is offline   Quote
Old 04-19-2010, 07:47 AM   #3
Join Date: Jan 2009
Posts: 132
Mrmikeypoo is on a distinguished road
80 psi?!?! wow
Mrmikeypoo is offline   Quote
Old 04-19-2010, 08:17 AM   #4
Hacks off Parts while Lit
whitebuffalo's Avatar
Join Date: May 2005
Location: The Sandhills of South Texas
Posts: 2,290
whitebuffalo is on a distinguished road
3.07s with an auto and 33s would def cause your lack of acceleration and horrible gas mileage. i'm not sure which autos there were that year so ill let someone else recommend which gear ratio would be ideal.

i would try replacing the oil pressure sensor first. the fact that it drops off instantly and then comes look there first.
'90 YJ, ford 8.8, SOA, lincoln front, aussie rear, 4.88s, swampers.
whitebuffalo is offline   Quote
Old 04-19-2010, 08:25 AM   #5
Ken Steele's Avatar
Join Date: Apr 2010
Location: Fallbrook
Posts: 128
Ken Steele is on a distinguished road
There are a lot of threads on here about gear ratios in relation to tire size. Do a search to dig back and see what everyone has to say. The good news is that no matter what ratio you decide to go with, it will be better than what you have right now. 4.10 - 4.56 would probably be best. As far as the oil pressure, it sounds like you have a bad sending unit on the engine. Easy to replace. Another possibility is a bad connection on the leads from the sending unit. Jeeps are known for this. Also easily fixed with lithium grease.
Ken Steele is offline   Quote

gas mileage , gear ratio , low top speed , oil pressure

Thread Tools

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 Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
How to tell gear ratio? liv2ryd JK Tech Forum 4 08-20-2009 02:34 PM
Which Gear Ratio Dan JK Tech Forum 7 07-22-2009 10:23 AM
First Jeep Needs Rear End..Gear Ratio is???? Zeus YJ General Discussion Forum 3 05-19-2009 06:20 PM
Gear Ratio Sugestions kyle Stimach CJ General Discussion Forum 0 04-24-2009 02:13 PM
Gear ratio advice for 33" tires on 4 Cylinder BillD TJ General Discussion Forum 19 02-29-2008 10:18 AM

All times are GMT -5. The time now is 07:05 AM.

User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.

Jeep, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC. is not in any way associated with the Chrysler Motors LLC

Enter your email address:

Delivered by FeedBurner