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Old 11-18-2013, 12:49 AM   #1
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YJ Slow-J

Hey everyone, this is my first thread. I've mostly been lurking the forums, but now I'm having an issue. But to clear things up first, I don't know very much about tech at all. Though, I think my questions will be straight forward, so there won't be a need to dumb things down.



So we've finally gotten my YJ fixed up and running. It's been plagued with problems from the start, mainly from the mods that the previous owner installed. Mind you, it looks like new, but my gosh the wiring was a ticking bomb. I was told that it could start a major fire, or worse.

Anyways, there's one last problem I have with it. It's the slowest Wrangler in existence. There is something noticeably wrong with it, it can barely go up a hill. The previous owner had done an engine swap, but all I know is that it's a 6 cylinder from a Cherokee. It sounds great though, that's for sure.

What can I do? I'm sick of all these dudes driving Prius's as if they were race-cars, and passing me with a finger.

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Old 11-18-2013, 06:17 AM   #2
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If it's out the a cherokee its the 4.0. Some questions:

What year?
Auto or Manual?
What size are those tires?

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Old 11-18-2013, 03:06 PM   #3
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Quote:
Originally Posted by Thomas S View Post
If it's out the a cherokee its the 4.0. Some questions:

What year?
Auto or Manual?
What size are those tires?
1988
Manual
And I believe they're 35 inch.

I appreciate the help.
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Old 11-18-2013, 03:21 PM   #4
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How many miles are on the engine? My guess is its just under geared for 35's and that the previous owner didnt bother to swap gears before going to 35's
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Old 11-18-2013, 03:54 PM   #5
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3.07 gears with 35" tires is a problem right there! I have 35" and have 4.56 gears.
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Old 11-18-2013, 04:25 PM   #6
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As of right now I have 3:07 and 33's I do ok in 1st through 4th, but it falls on its face in 5th. I have everything needed to do a 8.8 swap with 4:10's.
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Old 11-18-2013, 04:48 PM   #7
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Your problem can definately be a gear issue. However, if you have a Cat and it's clogged that will cause it to feel like you have no power.
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Old 11-18-2013, 11:03 PM   #8
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Ahh that makes a lot of sense guys. And to answer JKeeper my engines got about 230,000 miles on it.
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Old 11-18-2013, 11:14 PM   #9
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Nice looking Jeep! Probably gears, but I'd check the motor over real good, might be good to put it on a diagnostic to see if there are other problems. As for the Prius's, one of them passes me and shows the finger I'll make him a speed bump, I think my bumper is about as high as their roof.
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Old 11-18-2013, 11:28 PM   #10
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Originally Posted by reno92 View Post
Nice looking Jeep! Probably gears, but I'd check the motor over real good, might be good to put it on a diagnostic to see if there are other problems. As for the Prius's, one of them passes me and shows the finger I'll make him a speed bump, I think my bumper is about as high as their roof.
Thanks, and oh man I would give anything to see that. ;D
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Old 11-19-2013, 06:16 AM   #11
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I agree with everyone else. If the engine sounds healthy. Sounds healthy when revving, your problem is most likely gearing.

Although the engine you have didn't come in your year. There is always the possibility it wasn't swapped correctly. If you know someone with a Jeep and they have smaller tires. Might be a nice troubleshooting step to swap his tires on for a test drive.
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Old 11-19-2013, 11:39 AM   #12
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Quote:
Originally Posted by Thomas S View Post
I agree with everyone else. If the engine sounds healthy. Sounds healthy when revving, your problem is most likely gearing.

Although the engine you have didn't come in your year. There is always the possibility it wasn't swapped correctly. If you know someone with a Jeep and they have smaller tires. Might be a nice troubleshooting step to swap his tires on for a test drive.
That's a good idea actually. Thanks.

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