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Unread 09-02-2012, 05:11 PM   #1
MAC57
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Rubi front springs,which side does the stiffer one go on?

Swapping the stock springs in my 08 Sahara for take offs from a 4 door Rubi to help with sagging when I'm towing.Rears are the same part number, fronts though have two different numbers, one ends in 15 and one in 16. On my Sahara they are both 14's. I know the 16 is the stiffer of the two, but which side does it go on, passenger or driver? And why?

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Unread 09-02-2012, 05:20 PM   #2
RockyClymer
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If I had to guess....which is what it is (not sure why two part numbers, the stock on my 08 JK were the same) it would be passenger, because the gas tank is on the right side...
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Unread 09-02-2012, 05:35 PM   #3
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Unread 09-02-2012, 05:39 PM   #4
MAC57
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I thought of that, but then thought that the weight varies depending on how full the tank is, so why build it stiiffer on that side when it isn't constant? And my tank always seems to be closer to empty anyway !! My guess was the drivers side would be the stiffer one since the front drive shaft and most of the t case are on that side, Anyone know for sure?
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Unread 09-02-2012, 05:42 PM   #5
BadTrainDriver
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Going from 14's to a 15 and a 16 isn't even worth the effort...

Wait and pick up at least 18's.
On the rear, don't change unless at least 58's.
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Unread 09-02-2012, 06:22 PM   #6
MAC57
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Got 59's for the rear,they are on already,gave me a good 1/1/2" of lift, guess my old ones were also sagging after 90,000 kms. Got a bit too much rake to the front now so a little tweek up a level or two should do the trick. So, anyone know for sure which side the stiffer one goes on?
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Unread 09-03-2012, 10:41 AM   #7
MKWrangler
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It sounds to me like whoever built that Jeep at the factory screwed up. They should both be the same number.
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Unread 09-03-2012, 10:47 AM   #8
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My 2009 unlimited Rubicon had the higher number front spring on the right (passenger) side. Some JKs have matching fronts and some have the higher spring rate on the right front side.
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Unread 09-03-2012, 12:22 PM   #9
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the higher rated spring is not necessarily for static weight. The auto trans Rubi has the stiffer right spring.

Ever noticed when you put it in 4lo when you shift into drive it torques and the body leans a bit to the right? The Rubis lower transfer makes it worse so a stiffer spring helps absorb and even out the torque. A stick doesn't load when clutched so the standards have equal springs. the right front for an auto Sahara is rated just under the Rubi auto right. The diff is so small that it is conceivable that when marrying chassis to builds they can use one for another in some cases and stay within a wide tolerance - as well as dealer replace some with another in maintenance and repairs...
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Unread 09-03-2012, 03:43 PM   #10
MAC57
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Thanks J Wm for explaining. Mine is a standard so I should use matching springs then. I'll do what BadTrainDriver suggested and look for a pair of 18's
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Unread 09-03-2012, 04:36 PM   #11
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My standard had a 17/18 front combo.
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Unread 09-03-2012, 05:16 PM   #12
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I'd put the stiffer one on the passenger side as the torque of the motor puts more load on the right side.
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Unread 09-05-2012, 09:00 PM   #13
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Quote:
Originally Posted by jcgribks View Post
I'd put the stiffer one on the passenger side as the torque of the motor puts more load on the right side.
This is correct, and also the way my 08 Rubi stick came from the factory. Higher number to passenger side.
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Unread 09-06-2012, 12:29 PM   #14
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Interesting stuff. I would've guessed left (drivers) side should be stiffer to offset the weight of the driver.
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