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Unread 12-01-2009, 08:13 PM   #1
john_casmir
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1990 YJ Wrangler 
 
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No power in 5th Gear!! Is this normal??

Hey i just recently made the switch to the jeep family, and bought a 1990 yj with a 4.2 and only 100,000 miles on it. It runs pretty good now that ive done some work to her, but my question is, i have 31" tires on it, and it seems like if there is a slight wind, os a slight incline, that i lose speed when im in 5th gear! Is this a normal thing?? Ive never owned a stick before, nor a brick with wheels! =) But the thoughts of no doors or top in summer, with girls riding in the back was too much of a temptation not to buy one!
Any info or input would be greatly appreciated!

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Unread 12-02-2009, 06:11 AM   #2
rulppa
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Quote:
Originally Posted by john_casmir View Post
Hey i just recently made the switch to the jeep family, and bought a 1990 yj with a 4.2 and only 100,000 miles on it. It runs pretty good now that ive done some work to her, but my question is, i have 31" tires on it, and it seems like if there is a slight wind, os a slight incline, that i lose speed when im in 5th gear! Is this a normal thing?? Ive never owned a stick before, nor a brick with wheels! =) But the thoughts of no doors or top in summer, with girls riding in the back was too much of a temptation not to buy one!
Any info or input would be greatly appreciated!
31x10.5 are somewhat equal to 33x12.5. I have 35x13.5 mudzillas what are also somewhat equal to 33" (some 33x12.5" measures taller actually) .. my car is 4.0 so it has more power I guess, 5th gear is totally useless for me. You need to change gears, buy smaller tires or get used to it
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Unread 12-02-2009, 06:21 AM   #3
Savasa
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John,
Hmmm.....Girls in the back, no top, temptation...Keep her low and slow young man. I think the ladies will appreciate this as opposed to a racing around rice rocket. They will be more impressed by your big rubber than "bling" and whaddya mean BRICK????
Peter
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Unread 12-02-2009, 06:24 AM   #4
1998zj
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The 4.2 makes less horsepower than the 2.5. I had an 89 with the 4.2 and it didn't go any faster than my 95 with the 2.5. It did have more power below 2500 rpm but after that it was gutless.
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Unread 12-02-2009, 07:02 AM   #5
Rohdawg
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^^^I guess I really lucked out. I have an 89 with the 4.2, I'm running 33x12.5's (automatic) and I have NO problem with power. I've read all the slams against my motor and I am just not experiencing any of the typical problems. Guess I'm fortunate but I'm sure the Jeep gods will slam me eventually....
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Unread 12-02-2009, 08:17 AM   #6
jeepman95yj
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Gears, Gears Gears.
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Unread 12-02-2009, 08:28 AM   #7
Meiacanthus
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Oh gear! LOL
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Unread 12-02-2009, 08:29 AM   #8
pasinbuy
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Quote:
Originally Posted by Rohdawg View Post
^^^I guess I really lucked out. I have an 89 with the 4.2, I'm running 33x12.5's (automatic) and I have NO problem with power. I've read all the slams against my motor and I am just not experiencing any of the typical problems. Guess I'm fortunate but I'm sure the Jeep gods will slam me eventually....

You have a automatic and what is being talked about is a stick.
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Unread 12-02-2009, 09:40 AM   #9
penknife
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I just bought my YJ a month ago, and I loose speed in 5th most of the time too unless I'm going downhill. Hell, I can only get like 60mph out of my Jeep in 4th, but I don't even know how accurate that speed is (I'm probably going to get the wife to ride behind me today). Bad thing is I don't have huge tires or anything, however I do run without top and wind resistance may be a problem.
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Unread 12-02-2009, 09:44 AM   #10
lancer27
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i have the same problem, but when i upgraded to the mc2100 with the team rush i was able to run around 75 in 5th and could hold that pretty decently for the first time ever. but recently i have lost the power it seems, so im back where i started lol
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Unread 12-02-2009, 10:22 AM   #11
vmann7
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Its all in the gearing. My 87 4.2 even with the stock tires couldn't make it up a hill in 5th, when I went to 33's 5th became completely useless. I swapped in a set of 4.10 axles and while it still won't get out of its own way I can do 70 in 5th as long as I wind the motor out getting there.
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Unread 12-02-2009, 10:27 AM   #12
Bowfin
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Yep, that's typical. Even my 4.0 is sluggish in 5th. I don't use it unless I'm over 60 on a hwy.
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Unread 12-02-2009, 10:43 AM   #13
OSYJ93
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Quote:
Is this a normal thing??

Unfortunately yes...it's normal. Welcome to the family.
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Unread 12-02-2009, 11:16 AM   #14
giggityjeeper
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HEY what is 5th gear.....






/runs out to look at the diagram on his shifter....







WELL **** ME.....I got 2 gears past 3rd....






LOL running 33x12.5 TSL....lol 5th gear what is that
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Unread 12-02-2009, 11:51 AM   #15
ZeroGravity
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Quote:
Originally Posted by rulppa View Post
31x10.5 are somewhat equal to 33x12.5. I have 35x13.5 mudzillas what are also somewhat equal to 33" (some 33x12.5" measures taller actually) .. my car is 4.0 so it has more power I guess, 5th gear is totally useless for me. You need to change gears, buy smaller tires or get used to it
Every Jeep is different, but I wouldn't go as far to say that 31x10.5 is the same as 33x12.5. I switched from 33s to 31s last march and there was a very noticeable power gain. I can hold 65 MPH going up a slight incline at 2000 RPM on the highway very well and can even accelerate in 5th.

From what I know it has stock gearing. The diff tags were too rusty to read anything on.
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