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Topic Review (Newest First)
02-22-2013 04:12 PM
TrueNorth Even at 3" of lift in my 2 door I needed adjustable track bars to re-center the axles.

Adjustable lower control arms corrected the twitchy steering and wandering all over the road at highway speeds.

On my second set of stock driveshafts at 50K miles.
02-22-2013 01:14 PM
Dj Captain
Quote:
Originally Posted by rics1997 View Post

No it isn't. Now I say this based on the OP's original post. Of course you can go any height you want if you have the money and replace more then just suspension. But he states; what is the biggest lift ONLY doing suspension parts. Any lift on a 2dr more then 2.5" is acceptable to fatal driveshaft failure. Now that is mainly when you disconnect. If you don't disconnect then you can go to 3" and probably no issues but even then you are not guaranteed to get by without replacing the driveshaft.

Will everyone that does a 3.5" lift have failure? No, but it is irresponsible to say the next person won't because different lifts give either more then they say in lift and some cheaper ones will sag and not give what they state. Not to mention the way you drive or whether you off road or not. It is very common though for people with 3.5" lifts to have fatal angle CV boot failure do to rubbing. Now on a 4dr, you can get by with an extra 1/2" more then a 2dr do to the length of the drive shaft. It takes a little more height to get to the fatal angle.

Good read

Fatal Angle Tom Woods JK Wrangler Driveshafts - Jp Magazine
Missed the "suspension only" part, my miss
02-22-2013 01:13 PM
rfortune
Quote:
Originally Posted by JeeK View Post
Ok, so I went 70 to see where I'd be at. I was at 2600 rpm at 70. What does that mean?

My guess is 3.73s with little tires. Bigger tires will also lower your engine RPM necessary to travel a particular speed.

I was running ~2500-2600 with 4.10s and stock 255/75s at 70MPH

Switched to 315/70s and the RPM are now in the ~2200-2300 range at 70MPH
02-22-2013 12:53 PM
rics1997
Quote:
Originally Posted by Dj Captain View Post
3.5" lift is totally fine on a 2 door.
No it isn't. Now I say this based on the OP's original post. Of course you can go any height you want if you have the money and replace more then just suspension. But he states; what is the biggest lift ONLY doing suspension parts. Any lift on a 2dr more then 2.5" is acceptable to fatal driveshaft failure. Now that is mainly when you disconnect. If you don't disconnect then you can go to 3" and probably no issues but even then you are not guaranteed to get by without replacing the driveshaft.

Will everyone that does a 3.5" lift have failure? No, but it is irresponsible to say the next person won't because different lifts give either more then they say in lift and some cheaper ones will sag and not give what they state. Not to mention the way you drive or whether you off road or not. It is very common though for people with 3.5" lifts to have fatal angle CV boot failure do to rubbing. Now on a 4dr, you can get by with an extra 1/2" more then a 2dr do to the length of the drive shaft. It takes a little more height to get to the fatal angle.

Good read

Fatal Angle Tom Woods JK Wrangler Driveshafts - Jp Magazine
02-22-2013 11:55 AM
Raiderfan001
Quote:
Originally Posted by Dj Captain View Post
3.5" lift is totally fine on a 2 door.
Only if you're willing to replace the drive shafts a lot sooner than you would with a 2.5" lift...
02-22-2013 11:36 AM
Dj Captain
Quote:
Originally Posted by rics1997 View Post
A 4 door can get up to a 3.5" usually without issues but a 2dr....no.

3" max and even some have had issues with 3". I have a 3" on mine with no issue. The reason is the 4 dr has a longer driveshaft so it can go a little more before it hits the critical angle.

3.5" lift is totally fine on a 2 door.
02-21-2013 10:56 PM
JeeK Ok, so I went 70 to see where I'd be at. I was at 2600 rpm at 70. What does that mean?
02-21-2013 10:04 PM
JeeK
Quote:
Originally Posted by jkjeeper06

At 70 mph it's the difference between ~2000rpm and ~2300rpm. You'd be fine on 33's, although you'd lose some power, and depending on how light of a tire you get and how much you can deal with power loss, you might be able to go for 35's but you might end up regearing($1500)
I probably won't go bigger than 33's. Thinking about just going 32's at the moment so. And the jeep is already slower than all hell so I don't think I want to go any bigger/ heavier on the tires and lose more power.
02-21-2013 08:27 PM
rics1997 A 4 door can get up to a 3.5" usually without issues but a 2dr....no.

3" max and even some have had issues with 3". I have a 3" on mine with no issue. The reason is the 4 dr has a longer driveshaft so it can go a little more before it hits the critical angle.
02-21-2013 08:21 PM
jkjeeper06
Quote:
Originally Posted by JeeK

Thank you for the info.
Now what are the major differences in those gear ratios?
At 70 mph it's the difference between ~2000rpm and ~2300rpm. You'd be fine on 33's, although you'd lose some power, and depending on how light of a tire you get and how much you can deal with power loss, you might be able to go for 35's but you might end up regearing($1500)
02-21-2013 07:55 PM
JeeK
Quote:
Originally Posted by jkjeeper06
Most likely you have 3.21 gear ratios. Thats what most came with from the factory if they were a 6speed X or Sahara. That said could be 3.73.

Like said you have about 3" of lift before you replace driveline components. You can do up to, but not over, 1.25" body lift too without having to modify the shift console.

If you throw flat fenders on or chop yours you could easily have enough room for 40's with 4.25" of lift and flatties. I wouldn't recommend that tho cuz then you will also start breaking things
Thank you for the info.
Now what are the major differences in those gear ratios?
02-21-2013 03:28 PM
jkjeeper06 Most likely you have 3.21 gear ratios. Thats what most came with from the factory if they were a 6speed X or Sahara. That said could be 3.73.

Like said you have about 3" of lift before you replace driveline components. You can do up to, but not over, 1.25" body lift too without having to modify the shift console.

If you throw flat fenders on or chop yours you could easily have enough room for 40's with 4.25" of lift and flatties. I wouldn't recommend that tho cuz then you will also start breaking things
02-21-2013 03:18 PM
JeeK
Quote:
Originally Posted by Raiderfan001
You can also sign up and logon to the Owners section of Jeep.com and enter your VIN and be able to look up the build sheet that way.

I believe the general rule of thumb for lifting 2 doors is that anything over about 3" you will probably need to replace driveshafts sooner or later. A pretty common lift size is 2.5"
Sweet, I'll try that.
02-21-2013 04:14 AM
Raiderfan001 You can also sign up and logon to the Owners section of Jeep.com and enter your VIN and be able to look up the build sheet that way.

I believe the general rule of thumb for lifting 2 doors is that anything over about 3" you will probably need to replace driveshafts sooner or later. A pretty common lift size is 2.5"
02-21-2013 04:01 AM
JeeK Thanks for the info. Thankfully there's a dealership right next to mine. I'll run over and ask.

Thank you.
02-20-2013 11:13 PM
Bullrider3711 You may be lucky and still have the tag on top of the diff. cover which will tell you. Or give your VIN to the dealer and they can check
02-20-2013 11:11 PM
Bullrider3711 Someone may have better info than me but as far as I know the highest you can go is 3.5 or maybe 4" without having to mess with the driveshaft and other parts. You will have either 3.21 or 3.73 gears were also and option that could have been added.
02-20-2013 11:07 PM
JeeK
How high can i go?

I have an 08 X 2dr

How high could I go with out having to replace parts that aren't related to the lift/ suspension?

also what is the gear ratio on this car (6speed man)

Thanks in advance.

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