I need some help. About one week ago I purchased a 2002 Jeep wrangler (soft top - 4 cyl engine) the jeep has 50000 miles on it what I think is about a 6 in lift and some 35 size tires. I have found the jeep to be extremely slow, it picks up ok but it will not go over 40-45 mph and after a while maybe 50-55 mph I have changed the oil on the car, spark plugs and wires, had injectors clean and changed air filter. Before I do a major investment and further change anything on the jeep I want to know if this is normal or what might my jeep have. I know it might be a heavy car for a 4 cyl but I think it is very slow. Please I need some help!!
Very Slow JEEP -- HELP!!!
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3,325 Posts
Actually Jeeps are light weight. A little over 2k lbs. What size tires does it have?
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13,636 Posts
Did you install the lift and tires? If not I'm guessing that they never regeared the axles. Regearing the axles to 4.88 gears should help out quite a bit. Expect about $1000 or a little more to get this done at a decent shop. Is it an automatic?
Its the damn heavy frame.
Actually - they are closer to 4K
Its the damn heavy frame.
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2,704 Posts
you do know that you will have to do a re-gear with the lift and tires right? X2, what size are the tires your running now
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2,704 Posts
oops my bad I thought he said that he was going thinking about putting them on there, guess thats what I get for reading too fast.
No I bought the jeep already like this and actually it's not a 6 in lift its only 4 in lift but the tires are 35" and already installed. It is manual transmission, I don't think anyone regeared the axles. Should there be any reason for me to believe that this is occuring because my fuel pump or filter is not working properly or dirty??? Thanks.
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2,704 Posts
4" with 35's, you have any pictures? I was thinking about doing that set-up with a tera-flex kit. I would really like to see a front and side view if you have some.
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50,240 Posts
You are thinking of a much older CJ with that kind of light weight. You won't find any Wrangler TJs much under 3300 lbs or so, mine weighed 4200 lbs. the last time I weighed it on a certified truck scale. His 2.5L SE will be much lighter than my 4200 lbs. but it'll still be well over 3,000 lbs.
So far as why the OP's 2.5L won't accelerate, it's due to the combination of the 2.5L engine, 35" tires, and stock 4.11 gearing.
He can't regear to 5.13 gears, the lowest ratio available for his Dana 35c and Dana 30 is 4.88 which will be MUCH better. 5.13 would be more appropriate for those 35" tires and his 4-banger but without new f/r axles, that won't happen.
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13,636 Posts
The TJ D30 wont, but the JK D30 will.
He'd need new axle in the front if he wanted 5.13's.
Yep, you've gotta bad combo of tire size, gears and the "Lo-Output" 2.5! Simple fix is new gears, might also consider selling of those 35's going w/ something a little more practical. With the lift you have, 33's on some nice light steelies would probably help w/ you issue some, but in the end, you will most likely need to regear. As it is, I'm surprised you haven't broken anything running those 35's on an otherwise stock jeep.
http://i135.photobucket.com/albums/q155/sgnellett/DSCF0651.jpg
http://i135.photobucket.com/albums/q155/sgnellett/DSCF0651.jpg
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