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Unread 01-13-2014, 03:23 PM   #16
Reno72
Senior Member
1992 YJ Wrangler 
 
Join Date: Jan 2013
Location: Cardiff by the Sea - Glamis North, Ca
Posts: 553
I have the 4.0 5-speed, I'm running 35's with 3.73 gears at this time. I can cruise at 70 in 5th turning just under 2000 rpm's, if I have a long hill I can go into 4th and turn 2500+ to keep speed (this speed is by GPS, my speedo is almost 20% off) There is something wrong with your 4.0 unless your Auto has really high gearing.

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Unread 01-13-2014, 03:39 PM   #17
bsundacvr
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1995 YJ Wrangler 
 
Join Date: Nov 2013
Location: Port St. Lucie, FL
Posts: 13
Everyone I talk to says it needs to be geared, it only has 135,000 on it, like I said it ran easily up to 78 mph before the lift and tires
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Unread 01-13-2014, 06:49 PM   #18
Que89YJ
Web Wheeler
1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 14,564
There is definitely something wrong. I wish he filled out the profile. I hate hunting through a thread to trying to find info to offer help.
Follow the instructions in this thread and check your faults. Post what you find:
http://www.jeepforum.com/forum/f12/h...codes-1257145/
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Unread 01-13-2014, 08:39 PM   #19
lander2312
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1993 YJ Wrangler 
 
Join Date: Aug 2012
Location: White Bluff, TN
Posts: 233
OP take my advice and fill out your profile so that people like Q can help you. He has helped me and the knowledge he has is pretty impressive....but you have to take the time to help yourself.
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Unread 01-15-2014, 02:47 PM   #20
XJ93
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1995 YJ Wrangler 
 
Join Date: Apr 2009
Location: Michigan
Posts: 705
Quote:
Originally Posted by bsundacvr View Post
Everyone I talk to says it needs to be geared, it only has 135,000 on it, like I said it ran easily up to 78 mph before the lift and tires
Right, if you are still running stock gears which could be 3.07 like mine, then running that large of a tire can really kill your speed. Like so many have said you really need to fill in your profile so people like Q can help. That guy knows his stuff.
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Unread 01-16-2014, 03:49 AM   #21
bsundacvr
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1995 YJ Wrangler 
 
Join Date: Nov 2013
Location: Port St. Lucie, FL
Posts: 13
I filled out the profile, cant see it on my phone, but can on my computer.? Anyway, 1995 jeep yj 4.0, completely stock, other than 4" RC lift, and 33" BF Goodrich tires, and cold air intake w/Flowmaster muffler.
1525005_10200474145296022_1610134854_n.jpg

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Unread 01-16-2014, 08:32 AM   #22
xeroid81
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1995 YJ Wrangler 
 
Join Date: Feb 2008
Location: Grand Mound,Ia.
Posts: 928
Yes, I can see you filled out your profile under axle as stock. You need to understand stock can mean any of 4 different ring and pinion gears . It matters for gear ratio v.s. tire size. With 33's you'll need atleast a 4.10 gear. Really nice looking jeep by the way.
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Unread 01-16-2014, 08:43 AM   #23
SunDevilJeeper
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1992 YJ Wrangler 
 
Join Date: Jun 2010
Location: Phelan, CA
Posts: 3,122
Manual transmission, or automatic? That'll help us figure out what gears you're running.
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2003 WJ Limited - 4.7L H.O. V8

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Unread 01-16-2014, 08:48 AM   #24
Que89YJ
Web Wheeler
1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 14,564
Auto/manual?
What fault codes do you get?
http://www.jeepforum.com/forum/f12/h...codes-1257145/
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Unread 01-16-2014, 08:49 AM   #25
bsundacvr
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1995 YJ Wrangler 
 
Join Date: Nov 2013
Location: Port St. Lucie, FL
Posts: 13
Manual, this is my first jeep so I'm not sure what comes stock, and thanks
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Unread 01-16-2014, 09:11 AM   #26
Que89YJ
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1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 14,564
Check the codes and post back what they are. The video shows how. It will take you 5 minutes to do. I am betting that you have a bad O2 or air intake temp sensor.
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Unread 01-16-2014, 09:24 AM   #27
bsundacvr
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1995 YJ Wrangler 
 
Join Date: Nov 2013
Location: Port St. Lucie, FL
Posts: 13
Put a new o2 sensor in, because of CE light, now light is off, only code was because of no ac. It had a heavy exhaust smell, not like rotten eggs though. I put a cat on it, it helped alot, still smell it a little bit, but not that bad.
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Unread 01-16-2014, 09:52 AM   #28
Que89YJ
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1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 14,564
How long ago did you do all this? Do you have a meter and do you know how to use one?
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Unread 01-16-2014, 10:01 AM   #29
bsundacvr
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1995 YJ Wrangler 
 
Join Date: Nov 2013
Location: Port St. Lucie, FL
Posts: 13
About 2 months ago, the lift and tires, about 2 weeks ago, I don't have a meter
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Unread 01-16-2014, 11:40 AM   #30
XJ93
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1995 YJ Wrangler 
 
Join Date: Apr 2009
Location: Michigan
Posts: 705
There might still be a tag on your diff cover, may have to get out the wire brush, with the gear ratio on it. Otherwise use the tire/driveshaft method to figure out what you have. I am 99% certain your issue is caused by the larger tires without regearing if it was fine before the lift and tire swap.
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