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Old 07-24-2009, 03:20 PM   #1
Join Date: Jul 2009
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new 1990 wrangler

just purchased 1990 wrangler a week ago-today running strange: have to upshift almost immediately; in 4th gear by 30mph <?> any ideas? thanx
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Old 07-24-2009, 03:24 PM   #2
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i dont really understand what u mean

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Old 07-24-2009, 03:37 PM   #3
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difficult to explain-never happend to me before. gonna go out and mess with it and see if i can come up with anything
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Old 07-24-2009, 04:59 PM   #4
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It's not that it has done this since you purchased it, but more that it's doing it now. I'll assume you have a stock differential. A lot of problems occur when it seems the engine doesn't have as much power as it used to, which would cause you to shift too early. When the cat on my 89 rotted and was pretty much clogged it caused the same problem. Replaced the cat and the power increased to normal. I also replaced the muffler a few days later just to have the best flow, but the problem was the cat. Prior to replacing the cat it ran fine just lacked full power. I think you should disconnect and rule it out.
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Old 07-24-2009, 09:34 PM   #5
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I`m not quite sure what you mean either, but normally when a cat goes flat (goes out) it results in a moderate to severe lack of power, no matter what gear you`re in.
From what I make of it, it almost sounds like the transfer case is stuck in the low range.
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Old 07-24-2009, 10:33 PM   #6
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Originally Posted by Rainycity View Post
From what I make of it, it almost sounds like the transfer case is stuck in the low range.

Easy fix, take the short shift lever near your right leg & shove it forward. After it stops, it will be in "4wd High Range". Now pull it to the left & shove it all the way forward. You will now be in "2wd High Range".

90YJ 98XJ
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