95 yj wont go past 63 mph on interstate - Page 2 - JeepForum.com
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post #16 of 33 Old 01-13-2014, 03:23 PM
Reno72
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1992 YJ Wrangler 
 
Join Date: Jan 2013
Location: Cardiff by the Sea - Glamis North
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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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post #17 of 33 Old 01-13-2014, 03:39 PM Thread Starter
bsundacvr
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1995 YJ Wrangler 
 
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Location: Port St. Lucie
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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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post #18 of 33 Old 01-13-2014, 06:49 PM
Que89YJ
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1989 YJ Wrangler 
 
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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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post #19 of 33 Old 01-13-2014, 08:39 PM
lander2312
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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.

"People sleep peaceably in their beds at night only because rough men stand ready to do violence on their behalf."

George Orwell
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post #20 of 33 Old 01-15-2014, 02:47 PM
XJ93
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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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post #21 of 33 Old 01-16-2014, 03:49 AM Thread Starter
bsundacvr
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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.
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post #22 of 33 Old 01-16-2014, 08:32 AM
xeroid81
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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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post #23 of 33 Old 01-16-2014, 08:43 AM
SunDevilJeeper
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Manual transmission, or automatic? That'll help us figure out what gears you're running.

1991 YJ: Daily Driver
1992 YJ: Pile of crap sitting in the garage.
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post #24 of 33 Old 01-16-2014, 08:48 AM
Que89YJ
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Auto/manual?
What fault codes do you get?
http://www.jeepforum.com/forum/f12/h...codes-1257145/
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post #25 of 33 Old 01-16-2014, 08:49 AM Thread Starter
bsundacvr
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Manual, this is my first jeep so I'm not sure what comes stock, and thanks
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post #26 of 33 Old 01-16-2014, 09:11 AM
Que89YJ
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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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post #27 of 33 Old 01-16-2014, 09:24 AM Thread Starter
bsundacvr
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1995 YJ Wrangler 
 
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Location: Port St. Lucie
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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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post #28 of 33 Old 01-16-2014, 09:52 AM
Que89YJ
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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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post #29 of 33 Old 01-16-2014, 10:01 AM Thread Starter
bsundacvr
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Location: Port St. Lucie
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About 2 months ago, the lift and tires, about 2 weeks ago, I don't have a meter
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post #30 of 33 Old 01-16-2014, 11:40 AM
XJ93
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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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