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Old 07-19-2012, 11:25 AM   #1
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Bumpy bumpy

Hello All,

I am a rookie and just bought a 09 JK 2 dr. It has 2" lift and procomp M/T tyres on it. I feel the ride on highways very nice. But on local roads if i hit a bump or a bad road the jeep shakes. It seems as the shocks are too bad. Is it common for jeeps. I know it cannot be a smooth ride on bumpy roads like the regular sedans but it is too shaky. This is my first jeep and i have never drove a jeep before.

I have learnt many new things from this forum as i am very new to jeeps. )

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Old 07-19-2012, 11:29 AM   #2
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Tire pressure #1
Shocks #2

What tire/size/pressure and brand shock?

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Old 07-19-2012, 12:12 PM   #3
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Quote:
Originally Posted by kjeeper10 View Post
Tire pressure #1
Shocks #2

What tire/size/pressure and brand shock?
^^This

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Old 07-19-2012, 12:24 PM   #4
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Old 07-19-2012, 01:36 PM   #5
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To elaborate a bit - lower the tire pressure. My guess is your well above 35psi. As you read around here, you will find most of the people routinely keep 28-32 psi at the most in offroad class tires.

I know the tires I have - Nitto Trail Grapplers - are very heavy; they have more ply's than standard road tires - and even many offroad tires. They are also designed for light trucks, so, if you fill the air in according to manufacturer specs, the assumption is you have a full size pickup with a load weighing it down. This is not the case. I have a fairly small, light jeep - relatively speaking - and never increase the load on it. So I run my tires around 30psi. Smoothed my ride down considerably from the almost 60psi that the tire shop put in when I bought it! I also did the chalk tread test, where you determine the optimal psi by whether or not the full width of the tread is making contact with the pavement (you don't want the outer edges, or only the inner lugs making contact - you want it full/smooth across the width of the tire).
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Old 07-19-2012, 01:41 PM   #6
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Quote:
Originally Posted by sknyfats
To elaborate a bit - lower the tire pressure. My guess is your well above 35psi. As you read around here, you will find most of the people routinely keep 28-32 psi at the most in offroad class tires.

I know the tires I have - Nitto Trail Grapplers - are very heavy; they have more ply's than standard road tires - and even many offroad tires. They are also designed for light trucks, so, if you fill the air in according to manufacturer specs, the assumption is you have a full size pickup with a load weighing it down. This is not the case. I have a fairly small, light jeep - relatively speaking - and never increase the load on it. So I run my tires around 30psi. Smoothed my ride down considerably from the almost 60psi that the tire shop put in when I bought it! I also did the chalk tread test, where you determine the optimal psi by whether or not the full width of the tread is making contact with the pavement (you don't want the outer edges, or only the inner lugs making contact - you want it full/smooth across the width of the tire).


I chalked mine at 28/26 cold 35x12.5x15
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Old 07-19-2012, 08:48 PM   #7
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Glad we could help
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Old 07-19-2012, 08:54 PM   #8
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Nittos?!?
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Old 07-19-2012, 09:24 PM   #9
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Quote:
Originally Posted by Addy View Post
Hello All,

I am a rookie and just bought a 09 JK 2 dr. It has 2" lift and procomp M/T tyres on it. I feel the ride on highways very nice. But on local roads if i hit a bump or a bad road the jeep shakes. It seems as the shocks are too bad. Is it common for jeeps. I know it cannot be a smooth ride on bumpy roads like the regular sedans but it is too shaky. This is my first jeep and i have never drove a jeep before.

I have learnt many new things from this forum as i am very new to jeeps. )
Regular sedans? I hope you realize that a Wrangler is a truck and not a car.
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Old 07-19-2012, 09:27 PM   #10
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Quote:
Originally Posted by kjeeper10



I chalked mine at 28/26 cold 35x12.5x15
Sorry guys, berated by noobs. Could you spell this process out for me? What is optimal?
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Old 07-19-2012, 09:36 PM   #11
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Quote:
Originally Posted by RubiWhite

Sorry guys, berated by noobs. Could you spell this process out for me? What is optimal?
Chalking your tires ?

-Grab chalk
- draw a heavy line across tire
- drive back and forth a few times
- look at your chalk line

You want the chalk line evenly worn off.
Center only and you have too much air.
Outsides only not enough air.
One side, alignment is prob ef'd

Adjust until you have an even wear pattern
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Old 07-20-2012, 02:35 AM   #12
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Quote:
Originally Posted by kjeeper10

Chalking your tires ?

-Grab chalk
- draw a heavy line across tire
- drive back and forth a few times
- look at your chalk line

You want the chalk line evenly worn off.
Center only and you have too much air.
Outsides only not enough air.
One side, alignment is prob ef'd

Adjust until you have an even wear pattern
Ah! You da best.
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Old 07-20-2012, 06:57 AM   #13
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Also make sure your tires are round! I bought a set of tires once that were "out-around". Take you Jeep to a tire dealer who does "tire-truing". They can spin them and slightly shave them if they are out.
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Old 07-20-2012, 08:04 AM   #14
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Quote:
Originally Posted by unionjewel
Also make sure your tires are round! I bought a set of tires once that were "out-around". Take you Jeep to a tire dealer who does "tire-truing". They can spin them and slightly shave them if they are out.
I looked into this is and from what I gathered.
#1 nobody really does this no more
#2 would not touch a used tire anyways
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Old 07-20-2012, 12:46 PM   #15
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Thank u guys for ur suggestionsd
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Old 07-20-2012, 08:44 PM   #16
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Just have to do it once more...


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Old 07-20-2012, 08:50 PM   #17
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if its your shocks replace them with the bilstein 5100 I can't say enough good things about these shocks they are awesome.

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