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Old 06-16-2009, 12:23 PM   #1 (permalink)
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Rear Coil Spring mounting location?

I am putting coils in the back of my MJ truggy, with a 14 bolt....
Should I mount my coils UNDER the frame? Or OUTBOARD?

I'm thinking with the added leverage of a wider axle... the coil springs
will be too soft under the frame rails. I am using STOCK XJ coils in back.

I am building a 8" center stud for the rear upper coil mounts, similar to the front end, with a bumpstop in the center. The bottom of the coils will be trapped, should the TOP be trapped too?

I will be running 3 limiting straps to keep things in check.
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Old 06-17-2009, 09:51 AM   #2 (permalink)
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I trapped both ends on mine (YJ w/ no straps) and mounted it under the frame. I am fixing to go in about an inch (I think it is a little tight in the rear) and sink the coil into the frame so I can run a stock XJ coil and lower it more. I also have 2" spacers on my full width 9" so I have ALOT of leverage. I am sure your XJ is heavier though so I dont know if this helps any
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Old 06-17-2009, 07:42 PM   #3 (permalink)
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It's an MJ with back half tube... so, I'm not sure the weight issue compared to your Jeep.

Ballistic Fab has these adjustable upper coil buckets, where you can fine tune the placement of the bucket up to 5" of up/down adjustment. Im getting these so I can adjust my ride height without having to redo anything
and adjust my stance exactly the way I want it.

I just can't decide whether to put them inside the stock MJ frame rail or
on the outside. I don't have my rear 14 bolt axle yet, I'm just trying to get ideas and plan. I wasn't sure about the leverage factor... I obviously want flex... but I don't want super floppy coils that are too soft and give me crazy body roll.
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Old 01-18-2010, 05:56 AM   #4 (permalink)
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In the same boat. You have a tubed backhalf? So no wheel tubs or body? My problem is room outside the frame, it is flush with the wheel tub. Gotta make sure tire and wheel tub do not interfere. Could you mount them to the inside of the frame???
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Old 01-18-2010, 06:56 AM   #5 (permalink)
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Slightly diffrent rig. Same idea.

TONS of the XJ guys go straight under the rails with stock XJ coils. Me as well. Even the aftermarket bolt up rear 4-links, like Clayton, go straight under. I dont think outboarding them will have any firm advantages however, I dont think it would cause any problems if you did it either.

As for mounting, do exactly as you've planned. Capture the bottom side only. If you capture the top, you will stretch out the coil and its life span will quickly diminish. Duplicating the front design is fine. 1 3/4" tube works perfect with a stock isolator. Make it however long you desire for your rig, stuff your choice of bump in there and call it done.

As for bumpstops, no idea what your plan is BUT....seriously, seriously look into 06' and new Chevy 1500 rear bump stops. I paid 15 a piece for mine from the dealer and I cant tell you how much I love them. Will some very minor mods, the stuff right into the tube and they are progressive bumps. They measure roughly 4 1/2" long. The really to work tits though.

I would like to note that an XJ spring may not be ideal. If you find yourself with no other options that a sway bar will likely be needed.
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Old 01-18-2010, 07:05 AM   #6 (permalink)
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Id also like to note that outboarding them may not be an option at all. On the short side of my 14 bolt, after the coil mount, I have about 3" before the end of the tube/ begining of the spindle. My shock sits in that area, and its tight as hell at full stuff. Tire is about 1" from hitting the shock cylinder. Seeing how you have and MJ backhalfed, I can accruratly say what the diffrences would be.

Also, perhaps the rear rails are at diffrent heights, but a stock XJ coil usually nets around 8" of lift in the back of an XJ. I would check ride heights before you order a coil mount with 5" of adjustment.

Also, I have done an overwhelmingly vast amount of research on coils, rates, frequencies, etc.... so if you need a hand selecting a better spring let me know.
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