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Old 03-20-2017, 06:57 AM   #1 (permalink)
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TJ Gear change

I am sure I am going to get grief over this but here we go!
I have want to do a gear change and the charts on the net are a bit deceiving so I though I would ask here.
1998 TJ Hard Top 4.0 3.07 gears AX15 with 33.5" tires,
What gears should I have to bring the engine back into it correct operating RPM?
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Old 03-20-2017, 08:32 AM   #2 (permalink)
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6:17's
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Old 03-20-2017, 09:12 AM   #3 (permalink)
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6:17's
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Old 03-20-2017, 11:06 AM   #4 (permalink)
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Noobs. 9.43 minimum. Max performance I would go with a 12.82
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Old 03-20-2017, 11:07 AM   #5 (permalink)
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Seriously though... this is the Cherokee hardcore forum, I would post this question in the jeep non-hardcore section and maybe in the general 4x4 section as well. Or maybe search google. The tj has been around a long time and I'm pretty sure you would find the answer you want with a two minute google search on any jeep forum
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Old 03-20-2017, 11:22 AM   #6 (permalink)
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Gears

The header says Jeep-Cherokee so I though it covered both in the non hared core section. I do not see a section for the Jeep-Wrangler and as to searching the question I did and that is why I am here looking for first had info.
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Old 03-21-2017, 06:11 AM   #7 (permalink)
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Jeep - Non Hardcore - Pirate4x4.Com : 4x4 and Off-Road Forum
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Old 03-21-2017, 07:13 AM   #8 (permalink)
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Moved... to non hardcore...

2K posts and the jeep owner could not find the Jeep section
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Old 03-21-2017, 11:53 AM   #9 (permalink)
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I have 4.10s in my 2000. 4.0, 5 speed, 33" BFG KM2s. It's geared pretty good for the road, it'll go 75+mph comfortably (2600-ish rpm?) with 5th gear still being fine for lower speeds like 55-60. If you think you will go to 35s in the future, go lower now. 4.10s with 35s is no good in 5th gear unless everywhere you go is perfectly flat or downhill.
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Old 03-21-2017, 01:58 PM   #10 (permalink)
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diff

is that 2600 in 5th gear?
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Old 03-21-2017, 03:28 PM   #11 (permalink)
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I ran 4.56's in my 98 TJ with 33's. But I did start with 3.73's. I was much happier with the 4.56's when I upgraded to 35's.
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Old 03-21-2017, 04:39 PM   #12 (permalink)
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gears

My 35" tires truly measure 33.5"
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Old 03-21-2017, 05:28 PM   #13 (permalink)
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4.88's if your doing a good bit of wheeling or around town driving. You wont like them at 70mph

4.10's if your mostly on road.

4.56 if your not sure and you might go with bigger tires later.

Just my opinion. I have had the all....
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Old 03-21-2017, 05:37 PM   #14 (permalink)
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Rubicon came with 4.11s and 30.5 tires. The overdrive between the two is a .01 difference, so negligible.

There is no magical "correct operating RPM"

Minimum 4.56s on a regear.
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Old 03-21-2017, 06:00 PM   #15 (permalink)
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4.88 are perfect for 35s. A little too much for 33s on the highway
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Old 03-22-2017, 11:41 AM   #16 (permalink)
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4.88 are perfect for 35s. A little too much for 33s on the highway


X eleventy billion .


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Old 03-22-2017, 12:29 PM   #17 (permalink)
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I've been running 4.56 gears in my TJ since '99 with both 33" and 35" tires and it works great both on the trail and on the street. With 4.0:1 low range they got me up Sledge Hammer twice once on 33's and again on 35's



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Old 03-22-2017, 03:56 PM   #18 (permalink)
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gears

Driver jc how did you get 4:01 low atlas
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Old 03-22-2017, 10:09 PM   #19 (permalink)
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Wouldn't 4.0:1 be factory rubicon tcase
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Old 03-23-2017, 12:59 AM   #20 (permalink)
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Wouldn't 4.0:1 be factory rubicon tcase
Or a Tera low.
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