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Old 06-10-2012, 10:20 AM   #1
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Does everyone jack from the center of the differentials?

Hi, I wanted to jack up my jeep for tire rotation and was wondering if it is ok to use the differentials? The book says outer axle tubes but this does not work well because of the jeeps articulation to get all four tires off the ground. I have jacked up other vehicles this way for years. I just want to make sure the diffs are strong enough to handle this. The books tell us nothing as they do t want us working on them and taking money from the dealers.

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Old 06-10-2012, 10:26 AM   #2
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No-don't use the diff. for lifting the entire jeep--


Quote:
Originally Posted by JKUCRUSHMIKE View Post
Hi, I wanted to jack up my jeep for tire rotation and was wondering if it is ok to use the differentials? The book says outer axle tubes but this does not work well because of the jeeps articulation to get all four tires off the ground. I have jacked up other vehicles this way for years. I just want to make sure the diffs are strong enough to handle this. The books tell us nothing as they do t want us working on them and taking money from the dealers.
The jeep manual tells you where to place jacks and you should use the stock shock mounts/w block of wood and place jack stands for steady security-

If you have "Sliders" even better-thats what I use-

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Old 06-10-2012, 02:19 PM   #3
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Bah. There is nothing wrong with jacking on the differential with a floor jack. I do it all the time. If you are use the deadly stock scissor jack, then by all means follow the manual.
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Old 06-10-2012, 02:22 PM   #4
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I'm using a big floor trolley jack. I can't find in the manual where it says not to jack under the differentials. I just want to know what everyone her does.
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Old 06-10-2012, 02:24 PM   #5
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Heh Heh, it's your jeep-


Quote:
Originally Posted by JKUCRUSHMIKE View Post
I'm using a big floor trolley jack. I can't find in the manual where it says not to jack under the differentials. I just want to know what everyone her does.
Do exactly as Daggo says, never mind the Owners manual-

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Old 06-10-2012, 02:32 PM   #6
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Deadly scissor jack is right. MTH and I had his fly out from under the jeep while we were sitting beside it. I'm not sure it could actually support my 170 lb frame much less a JKU.
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Old 06-10-2012, 02:39 PM   #7
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Quote:
Originally Posted by daggo66 View Post
Bah. There is nothing wrong with jacking on the differential with a floor jack. I do it all the time. If you are use the deadly stock scissor jack, then by all means follow the manual.
Same here. Have used a floor jack for years to lift rear of vehicle with the jack under the diff. I always place a block of wood between the jack head and diff as a cushion. The diff housing is a big chunk of metal and more than solid enough.
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Old 06-10-2012, 02:42 PM   #8
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Quote:
Originally Posted by JKUCRUSHMIKE View Post
I'm using a big floor trolley jack. I can't find in the manual where it says not to jack under the differentials. I just want to know what everyone her does.
Trolley jack? I had to google it. I would prefer a hydraulic jack to one that uses springs.
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Old 06-10-2012, 02:43 PM   #9
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When using a floor jack no worries jacking it up by the diff IMO. That's how I do my tire rotations and how we installed my buddies budget boost. Floor jack + 6ton jack stands
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Old 06-10-2012, 02:50 PM   #10
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All you experts know that a JKU can weigh from 400 to 800 lbs more than the same JK-but

For some reason the Chrysler Owners manual specifies where to "lift" jeep from

Instruction manuals and suspension procedures--especially for yhe JKU, specify two points for complete jeep lifting--frame/directly underneath coils-(shock mounts)

Now since you all so sure the diff is the best lift point--

Carry on !

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Old 06-10-2012, 02:53 PM   #11
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Quote:
Originally Posted by JIMBOX
All you experts know that a JKU can weigh from 400 to 800 lbs more than the same JK-but

For some reason the Chrysler Owners manual specifies where to "lift" jeep from

Instruction manuals and suspension procedures--especially for yhe JKU, specify two points for complete jeep lifting--frame/directly underneath coils-(shock mounts)

Now since you all so sure the diff is the best lift point--

Carry on !

JIMBO
I completely agree with that when using a bottle jack or the scissor jack that JKs apparently come with and also the placement of Jack stands. But to get the jeep high enough to place jack stands, what issues do you perceive using a 6 ton floor jack (a JKU is what, 2 tons?) and lifting from the diff?
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Old 06-10-2012, 02:55 PM   #12
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Quote:
Originally Posted by JIMBOX View Post
All you experts know that a JKU can weigh from 400 to 800 lbs more than the same JK-but

For some reason the Chrysler Owners manual specifies where to "lift" jeep from

Instruction manuals and suspension procedures--especially for yhe JKU, specify two points for complete jeep lifting--frame/directly underneath coils-(shock mounts)

Now since you all so sure the diff is the best lift point--

Carry on !

JIMBO
The owners manual specifies where to jack up the jeep when using the factory scissor jack. Anyone with common sense wouldn't place a scissor jack under the diff, but a floor jack is fine. And the manual says nothing about NOT using a floor jack under the diff.

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Old 06-10-2012, 03:07 PM   #13
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Mine was simple-I used my KOBALT 3 ton floor jack and lifted each corner of my JKUR-put my 12-ton HL flootr jack under each frame locationright behind the LCA mount bracket--then the whole jeep was over 2-1/2 feet off the
garage floor-

The stock JKU weighs over 4400lbs/w gas and mine is a leightweight--5200lbs, before load-usually close to 3 tons, when camping, pulling trailer !

Quote:
Originally Posted by InvertChaos View Post
I completely agree with that when using a bottle jack or the scissor jack that JKs apparently come with and also the placement of Jack stands. But to get the jeep high enough to place jack stands, what issues do you perceive using a 6 ton floor jack (a JKU is what, 2 tons?) and lifting from the diff?

Then it was OK to put the KOBALT jack underneath each diff,. because it was only lifting the --"AXLE", not the weight of the jeep-

Chrysler is explicit on not trying to support the entire JKU weight on the outer ends of the axles, by lifting from the center, (diff.) they even draw pictures on the jack support underneath each "COIL"--which is kinds logical--don'tyathink ?

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Old 06-10-2012, 03:07 PM   #14
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Old 06-10-2012, 03:08 PM   #15
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Quote:
Originally Posted by InvertChaos View Post
I completely agree with that when using a bottle jack or the scissor jack that JKs apparently come with and also the placement of Jack stands. But to get the jeep high enough to place jack stands, what issues do you perceive using a 6 ton floor jack (a JKU is what, 2 tons?) and lifting from the diff?
I am with Jimbox on this one. The issue is stress on the axel. Have you ever seen when weight lifters pick up the bar with a lot of weight on each side? the bar is bent. That would be my theory on lifting by the diff.. Weight on each side of the axel with the pressure in the middle. Seems like a lot of unneeded stress. But like Jimbox said , it's your Jeep.
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Old 06-10-2012, 03:17 PM   #16
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Quote:
Originally Posted by chucky cheese
I am with Jimbox on this one. The issue is stress on the axel. Have you ever seen when weight lifters pick up the bar with a lot of weight on each side? the bar is bent. That would be my theory on lifting by the diff.. Weight on each side of the axel with the pressure in the middle. Seems like a lot of unneeded stress. But like Jimbox said , it's your Jeep.
Alrighty I see what you mean there.
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Old 06-10-2012, 03:25 PM   #17
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I think your TJs were in the 3500lb range and the JKs are close to 4000lbs

Quote:
Originally Posted by InvertChaos View Post
Alrighty I see what you mean there.
But when you start getting up above 2 tons/w the same axle housings--it's quite a strain on the axle tubes, by lifting from the center (diff)--

Mine is heavy, like I've said, but even if I hadda JK/modified--I wouldn't lift from the diff., not only is the weight/fulcrum ratio high, but it could lead to outer axle seal failure !

We should be out in the boonies, not arguing about jeep lifting !

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Old 06-10-2012, 03:47 PM   #18
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The owners manual lifting points are shown for using the welfare jack provided to change a flat tire in a emergency situation. Does anyone have access to a service manual to see what it states for lifting the jeep without the need to change one flat tire.
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Old 06-10-2012, 03:59 PM   #19
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Quote:
Originally Posted by JIMBOX
I think your TJs were in the 3500lb range and the JKs are close to 4000lbs

But when you start getting up above 2 tons/w the same axle housings--it's quite a strain on the axle tubes, by lifting from the center (diff)--

Mine is heavy, like I've said, but even if I hadda JK/modified--I wouldn't lift from the diff., not only is the weight/fulcrum ratio high, but it could lead to outer axle seal failure !

We should be out in the boonies, not arguing about jeep lifting !

JIMBO
Should've explained that in your original post :P
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Old 06-10-2012, 04:10 PM   #20
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Been doing my own wrenching on this Jeep since DAY 1. no problems lifting from the differential. Support it after with jack stands on each side after the tires are off the ground. We do this with 37s and 4" of lift on stock axles. Np
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Old 06-10-2012, 04:20 PM   #21
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Personally I'm OK with using the pumpkin at the rear because that end is lighter but if you're rotating tires why not get 4 jackstands? That way you're safe and you don't have to worry about which way is best. You can just jack up one wheel at a time at the factory approved places, put your stand in place and move on to the next wheel. Even then, I'd use a chock.
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Old 06-10-2012, 05:00 PM   #22
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When you take your Jeep in for service, where do they put the lift pads. On the frame, and thats where you should too. Lift one side, add jack stand, repeat for other side. Lifting from the diff is never a good idea, especially since it seems like the only reason for doing that is saving 1 minute of time. But hey, it's your Jeep, lift wherever you want.
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Old 06-10-2012, 05:03 PM   #23
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Quote:
Originally Posted by Dale_K View Post
Personally I'm OK with using the pumpkin at the rear because that end is lighter but if you're rotating tires why not get 4 jackstands? That way you're safe and you don't have to worry about which way is best. You can just jack up one wheel at a time at the factory approved places, put your stand in place and move on to the next wheel. Even then, I'd use a chock.
yes, don't forget the wheel chock. We lifted the Rubi Friday, took a quick test drive, found an adjustment to be made, went to lift the back end again and guess what we had forgotten to put back in front of the tire. It came within about 1 foot of rolling right into my Gecko.
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Old 06-10-2012, 05:15 PM   #24
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Quote:
Originally Posted by chucky cheese View Post
I am with Jimbox on this one. The issue is stress on the axel. Have you ever seen when weight lifters pick up the bar with a lot of weight on each side? the bar is bent. That would be my theory on lifting by the diff.. Weight on each side of the axel with the pressure in the middle. Seems like a lot of unneeded stress. But like Jimbox said , it's your Jeep.
I know what a stock Jeep weighs. But I am only lifting a portion of that weight by lifting under the rear diff. Jacking under the rear diff doesn't raise the whole Jeep off the ground. If you or anyone else prefers to place the jack under the axle tube and raise one side at a time, I'm not hatin. Just saying there is no proof that jacking under the diff is a bad thing. And the OP asked if it was ok.

Now where's the beer?
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Old 06-10-2012, 05:18 PM   #25
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Quote:
Originally Posted by SilverSport

I know what a stock Jeep weighs. But I am only lifting a portion of that weight by lifting under the rear diff. Jacking under the rear diff doesn't raise the whole Jeep off the ground. If you or anyone else prefers to place the jack under the axle tube and raise one side at a time, I'm not hatin. Just saying there is no proof that jacking under the diff is a bad thing.

Now where's the beer?
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There is a nice flat spot behind the gasket area
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Old 06-10-2012, 06:36 PM   #26
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Quote:
Originally Posted by SilverSport View Post
And the manual says nothing about NOT using a floor jack under the diff.
... and that kind of logic is why there's 100 warning stickers on step ladders.

I doesn't say NOT to jack it from the muffler either.
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Old 06-10-2012, 07:27 PM   #27
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Does it state anywhere not to lift by the differentials? My 2011 hemi ram said in the manual not go lift a loaded truck by the rear differential. I have been a auto tech for 20 years and have lifted hundreds of vehicles by the rear diff without any known issues. I just wanted to know what you guys on here do if you work on your jeeps at home without a lift. I have a heavy duty floor jack and 8 jack stands so I'm more than equipped. I don't want to ever cause any damage and I always double up on supports for safety. We need to be able to purchase a proper service manual from Chrysler. If anyone has access to a online manual it would show the lifting points for service using a floor jack. I am not happy lifting the jeep by the axle tubes. Think of all the bent axles that would be out there if you could not lift the Jeep by the rear diff. There would also be a big warning stamped on it not to do it as to cover their butt against warranty claims for axle issues. It's a jeep that doesn't mean it's that different than every other truck out there.
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Old 06-10-2012, 07:40 PM   #28
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I replaced the scissor jack with a 6 ton (iirc) bottle jack and a hi-lift.
With an aev diff skid, there isn't a lot of room to hit the flat spot under the diff.
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Old 06-10-2012, 08:03 PM   #29
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You see that vehicle in my avatar image? If you don't know what it is, it's a Buffalo - the data plate in mine said that it weighed in at 46,000 lbs unloaded (hull number 33, "War Admiral"). Thing about it is that the hull is v-shaped...nowhere on the hull/frame to put a jack. Now...with that said, time to throw some fuel on this...

Where do you suppose we put the jacks on my 23 ton vehicle when we needed to change spring packs, wheels, tires, etc.? What's that? Under the diff? Why, yes, yes we did. =). The 20-ton jack went right underneath the front diff. Of course, that axle housing was stout enough to survive an explosion that sent the drive shaft...well, I'm not sure...last anyone saw it was 50 meters away, still airborne and moving fast.
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Old 06-10-2012, 08:09 PM   #30
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Hooah!

Incidentally, my Jeep started rolling without parking break when I was taking off wheels recently. I guess it was amateur night on my part. Wheels still on and nothing happened, but I thought for a second the Jeep was going to roll onto me. Scary as f**k. Obviously, lesson learned: always put parking brake on. Long term, want to get a floor jack or something better than the POS scissor jack. I'm open to affordable suggestions.

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