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Old 08-26-2008, 09:21 AM   #1
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5th gear = no balls?

So I drove down from northern ohio to north carolina last week and took I-77. One I hit southern Ohio and for the rest of the drive it was very hilly and twisty speialy in west virginia if you haven't drive thru that area. Every time I was headed up hill cruising in 5th gear my TJ would start losing speed even with the gas pedal on the floor. So I downshifted to 4th gear. Is something wrong or is that normal? I have the 4.0L.

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Old 08-26-2008, 09:26 AM   #2
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What size tires? and what gears?

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Old 08-26-2008, 09:40 AM   #3
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stok size tires , rims, and gears for a '03 TJ X pkg 6cyl 5spd. 71k miles.
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Old 08-26-2008, 09:49 AM   #4
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I drive that route very often since I live in NC and have family in OH.

1. WV sucks to drive through!!!
2. I have the same issue going up some of the hills in my stock '04 Rubicon.
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Old 08-26-2008, 10:10 AM   #5
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I agree it is probably just the terrain. Sounds like all vehicles will struggle. Similar to SW Missouri. Tons of hills that makes you grab another gear regardless of what you are driving.
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Old 08-26-2008, 10:45 AM   #6
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So then the issue is just not enough low end power/torque in 5th gear on the incline?
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Old 08-26-2008, 10:47 AM   #7
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the problem is you do not have enough gearing in your axles to carry your weight up the incline. This is very common in the hills.
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Old 08-26-2008, 10:58 AM   #8
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Ok, that makes sense.
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Old 08-26-2008, 11:11 AM   #9
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Look on your front or rear axle where the differential cover is bolted on. At the 9 o'clock position will be a steel tag held to the cover by two of the differential cover bolts and on that tag, your axle's ratio will be embossed into it. It'll either say 3.73 (or 3.74 depending on which axle you look at) or 3.07. That's your axle ratio and if it's 3.07, that ratio keeps the engine rpms so low that the engine struggles to produce much power. 3.73 is a pretty peppy ratio for stock size tires.

But regardless of if you have 3.07 or 3.73, remember that 5th gear is strictly an overdrive ratio so it's not going to have much power no matter what axle ratio you have. If you had an automatic, it would be automatically downshifting out of its overdrive ratio when it needed a little more power so you need to do the same thing by downshifting from 5th to 4th at those 'lacking power' times.
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Old 08-26-2008, 11:34 AM   #10
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If you pay attention to semi trucks in that area even they have trouble getting up those hills. They have to go very slow in thier lower gears to get up the hills too.
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Old 08-26-2008, 11:35 AM   #11
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Yeah, I just thought I'd ask because before my wrangler I was used to my turbo Toyota Supra which had a 4.10 LS diff. In that on those hills in 5th gear it wouldn't slow down and if i hit the gass the turbo would spool and it wouldn't have a problem accelerating. Thats why I was asking if it was a lack of power.
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Old 08-26-2008, 11:51 AM   #12
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Just remember it's a stick shift, it has no brains telling it to downshift to a more appropriate ratio like an automatic has.
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Old 08-26-2008, 01:18 PM   #13
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I have a 04 4cyl 5spd 30x9.5's and it came with 4:10's. If I have more than myself in the vehicle I need to get in the truck lane if I want to stay in 5th.
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Old 08-26-2008, 03:25 PM   #14
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I live in WV and know what you mean. My Jeep has 3.07 gears so it rarely ever gets put into 5th gear. It is geared way to high.

I am going to put 4.56's in when I get my lift and 33's on it.
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Old 08-26-2008, 05:01 PM   #15
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Originally Posted by XNeoJesterX View Post
So I drove down from northern ohio to north carolina last week and took I-77. One I hit southern Ohio and for the rest of the drive it was very hilly and twisty speialy in west virginia if you haven't drive thru that area. Every time I was headed up hill cruising in 5th gear my TJ would start losing speed even with the gas pedal on the floor. So I downshifted to 4th gear. Is something wrong or is that normal? I have the 4.0L.
at first I was thinking you added taller tires(33's)plus without regearing, but then I see where you state your Jeep is stock. Losing speed in 5th going up seems normal to me. Downshifting is typical. How was 4th gear then??
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Old 08-26-2008, 05:06 PM   #16
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wv

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I live in WV and know what you mean. My Jeep has 3.07 gears so it rarely ever gets put into 5th gear. It is geared way to high.

I am going to put 4.56's in when I get my lift and 33's on it.
Have you ever been to Ronceverte WV? It's close to lewisburg
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Old 08-26-2008, 10:48 PM   #17
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4th gear i could accelerate BUT it wasn't very rapidly.
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Old 08-27-2008, 07:44 PM   #18
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No, Ive never been there, I live over next to Kentucky and Ohio.
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Old 08-27-2008, 08:38 PM   #19
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yeah my jeep did that crap too. had to downshift for every freakin hill.

i don't have to do that with the mustang now

i think it would have been solved with lower gears though.
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Old 08-27-2008, 09:29 PM   #20
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i made the same drive only to daytona in earlie summer. i was shocked at how bad the hills were too. no i had the same problem. actually just all highway driving is a pain in the ass.
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Old 08-27-2008, 09:35 PM   #21
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Quote:
Originally Posted by XNeoJesterX View Post
Yeah, I just thought I'd ask because before my wrangler I was used to my turbo Toyota Supra which had a 4.10 LS diff. In that on those hills in 5th gear it wouldn't slow down and if i hit the gass the turbo would spool and it wouldn't have a problem accelerating. Thats why I was asking if it was a lack of power.
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Just remember it's a stick shift, it has no brains telling it to downshift to a more appropriate ratio like an automatic has.
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Old 08-28-2008, 08:32 AM   #22
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Say I were to superharge the 4.0L that I have now. Does that mean that the rear end couldn't handle the added power when there was a load on it like going up the hills.
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Old 08-28-2008, 11:20 AM   #23
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Say I were to superharge the 4.0L that I have now. Does that mean that the rear end couldn't handle the added power when there was a load on it like going up the hills.
Don't supercharge your 4.0L (yet anyway), regearing your axles to a lower gear ratio is the quickest surest and definitely cheapest (when compared a supercharger) way to get a reliable and substantial boost in power.
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Old 08-28-2008, 12:58 PM   #24
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yeah eventually id like to do a 3.5 inch lift, 33" or 35" BFG M/Ts, front and rear bumpers, rocksliders, winch, beefier front and rear ends, and a Ken Bell supercharger kit. However, for the time being I'm a "poor" college student and can't afford it.
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Old 08-30-2008, 01:43 AM   #25
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Neo, depends how you drive it. If you dont launch it of the start, if you dont snap the gears when shifting you should be alright. Simply if you dont abuse it with "jerking" the gas you should be alright however if you want power, get another vehicle instead of a box with big wheels.
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Old 08-30-2008, 01:34 PM   #26
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hahha umm my 97 4 banger went to 82 mph last night that was all she had in it! She was at a consitant 70 from rockford to Gurnee. . I drove the ever loving piss out of her and well I need to get my other ride up and running. I have never drivin something so slow! BTW 82 in the jeep was very stable surprised me a lot.
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Old 08-30-2008, 01:42 PM   #27
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110 is also stable in a TJ.
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Old 08-30-2008, 01:49 PM   #28
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110 is also stable in a TJ.
I did everything in my power to get her to go faster and well umm that was not happening! Driving the brick on wheels! haha
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Old 08-30-2008, 03:56 PM   #29
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Neo, depends how you drive it. If you dont launch it of the start, if you dont snap the gears when shifting you should be alright. Simply if you dont abuse it with "jerking" the gas you should be alright however if you want power, get another vehicle instead of a box with big wheels.
I'm not trying to make it fast and I dont abuse it or try to drive it like a race car. I would however like more torque thru the entire powerband, hence the supercharger. It's just like swapping the motor for a turbo diesel which I would like to do more then a superchrager but is WAY more expensive. They produce much higher torque at lower RPM's. The ken bell supercharger kit averages 307 ft lbs torque on the dyno.
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Old 08-30-2008, 05:45 PM   #30
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I'm not trying to make it fast and I dont abuse it or try to drive it like a race car. I would however like more torque thru the entire powerband, hence the supercharger.
You keep ignoring the gearing suggestions and bringing up the supercharger. You really need to understand that a supercharger will NOT overcome an inappropriate axle gearing ratio, you really need to regear your axles to a more appropriate axle ratio first. Simply regearing both axles will give you huge across-the-powerband boost in torque. In other words, your gearing is like you're starting off in 2nd or 3rd gear right now. A supercharger would have to fight that. Regearing to match your tire size will restore the torque/power lost by having installed larger diameter tires. A supercharger is, flat out, the wrong way to fix that issue. Gear first, then you can add your supercharger if you still want it.

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