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Old 08-08-2014, 11:23 PM   #1
St1ngray's Avatar
Join Date: Jul 2014
Location: Seattle, WA
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RPM's in 4th

Hi all. I have an 03 TJ with the 4.0L and manual. Dana 44 on the rear diff with 373's. I'm just wondering how many rpm's most people run in 4th gear when going up hills (or even slight hills) on the highway. 5th gear seems to loose power almost instantly when going up hill so I have been using 4th quite a bit to keep my speed up. I've been going up hills in 4th at about 2500 rpms. Is that bad or too much??

On a separate note, I also notice that after driving for about an hour or so, the clutch starts making a clicking noise (and I can feel it when depressing the clutch pedal). Sometimes, it even seems to rub on something. I think there are other threads on this topic, but just thought I'd throw it out there again. I've only been a jeep owner for about 2 months now.
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Old 08-11-2014, 10:24 AM   #2
Join Date: Nov 2008
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Going up hills in 4th at 2500 sounds perfectly reasonable to me.

There are a lot of variations in what a driver likes. Personally, if there is no one behind me, I don't mind scrubbing several MPHs going up a hill for the sake of fuel economy. I always gain them back on the downhill side, and save a few sips of gas in the process.

A lot of folks put larger tires on their Jeeps, leaving the overdrive gear anemic and causing extra downshifting. It's all in what the driver wants. The Jeep comes with a number of transmission gears, so why not use them as you like. That's what you are doing by shifting to 4th on hills. No problems with that.

About the clutch, I don't have an opinion. Mine is an automatic.

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Old 08-11-2014, 07:02 PM   #3
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Close to 3000 uo hills sane set up 03 5spd 32" tires
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Old 08-11-2014, 10:58 PM   #4
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No matter the gear I try to keep the limit at 3100 rpm. I have a 6 spd and rarely get into 6th, though I did tonight coming back from Cape Cod. The wife's opinion is you have to shift. I tried explaining the RPM's to her, but she has a set gear for a set speed. Not necessarily. Depends on terrain and what you are trying to accomplish. Rule of thumb.....no gear over 3,000 RPM and you'll be fine. Red Line on the 05 LJ is 5200. Never been close and not going to be. On the other side, too little RPM is not good either. You get a feel what the tranny needs. Lugging and sluggish....downshift....starting to whine.....shift up....after a while it becomes feel.
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Old 08-14-2014, 09:33 AM   #5
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The reason I ask is because I use to have a 98 Sierra 1500 manual. When going up hills in 4th, it use to smell hot. I guess I've been a little paranoid.
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Old 08-14-2014, 01:15 PM   #6
Mostly old school..!

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The 4.0L engine is perfectly happy at 3000 rpm.

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