Do You Really Need Grade 8, 9/16", Fine Thread, Partially Threaded Replacement Bolts? - Page 2 - Jeep Wrangler Forum

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Old 05-25-2015, 11:49 PM   #31
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What about the upper control arms? Are they not the same set up?
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Old 05-26-2015, 07:59 PM   #32
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Quote:
Originally Posted by foolproof View Post
What about the upper control arms? Are they not the same set up?
The front uppers don't experience the same forces as the lowers. Stock, they are smaller diameter bolts, with a 75 ft lbs torque spec.

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Old 05-28-2015, 04:08 AM   #33
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Thanks good stuff! Do you know if the kit comes with instructions as to what and which bolts are suppose to get replace?
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Old 05-28-2015, 11:04 PM   #34
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Originally Posted by Jcx310jk2011 View Post
Thanks good stuff! Do you know if the kit comes with instructions as to what and which bolts are suppose to get replace?
I don't believe there are instructions with the Northridge4x4 kit.

Basically, you replace one bolt at a time, with the vehicle on the ground.

You can use ratchet straps to pull things together, but it's easier if you have a helper.

The helper can grab a tire and roll it forward or back to line up holes. They can turn your steering wheel right or left to help line up the front trackbar holes.

They can push the rear of the vehicle side to side to help line up the rear trackbar holes.

Tighten bolts with a ratchet and then torque with a torque wrench.

The control arm bolts are longer than the trackbar bolts.
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Old 05-29-2015, 02:58 AM   #35
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Copy that, thank you for the reply Sir!
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Old 05-29-2015, 09:19 AM   #36
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Only reason I'm doing this is peace of mind, and I had the foresight to buy everything before getting my lift put on. So this weekend when I do the lifr I'm installing all the new hardware. Otherwise I don't think I would do it.
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Old 09-07-2015, 08:20 PM   #37
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This is an excellent write up. Im a "rather have it and not need it" type of guy so when the lift goes on, the bolt switch will be taking place.
One question though, the price difference between the 2 kits (Synergy vs NR) is pretty significant. Is one better than the other? Why the big difference?
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Old 09-08-2015, 11:36 AM   #38
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It looks like the difference is the SAE grade 8 versus grade 9 hardware.

Choosing the Right Fastener | Hillco Fastener Warehouse, Inc.

Grade 9 vs Grade 8 fasteners - FFCars.com : Factory Five Racing Discussion Forum

I saw some concern about grade 9 breaking instead of bending due to the it being more brittle (it's harder).

Boltdepot prices:

G8 yellow zinc 9/16"-18, 4" long
Box of 10: $23.00
G8 yellow zinc 9/16"-18, 3" long
EA: $2.17x4
yellow zinc grade c prevailing torque lock nuts 9/16"-18
EA: $0.37x12
SAE flat washers, yellow zinc, grade 8 9/16", extra thick
EA: $0.56x24
90mm metric 14x2.0 90mm grade 10.9 zinc plated
EA: $2.71
zinc plated grade 10.9 prevailing torque lock nut 14x2.0
EA: $1.17

If I wanted to do a grade 8 kit with a similar parts list to the grade 9 synergy offers, it would cost me $53.44 plus shipping. I've used aircraft stuff on buggy suspension, but it sounds like grade 8 and the northridge stuff would work well.
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Old 09-08-2015, 12:57 PM   #40
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Thanks for the replies. Looks like NR will be getting an order from me soon!
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Old 11-14-2015, 10:15 PM   #41
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Note that the northridge shoulder bolts will not fit in the superlift rear trackbar bushings. I had to use the stock fully threaded hardware when replacing the rear trackbar with the superlift piece.
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Old 12-09-2015, 09:14 PM   #42
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OK, kind of a dumb question but do you have to use fine thread? Or could you use course thread? Still grade 8 bolts by the way.
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Old 12-12-2015, 08:17 PM   #43
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Quote:
Originally Posted by microdevil45 View Post
OK, kind of a dumb question but do you have to use fine thread? Or could you use course thread? Still grade 8 bolts by the way.
Fine thread bolts hold torque specs better than course thread bolts.
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Old 12-13-2015, 08:42 PM   #44
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Quote:
Originally Posted by microdevil45 View Post
OK, kind of a dumb question but do you have to use fine thread? Or could you use course thread? Still grade 8 bolts by the way.
I have run coarse thread grade 8s for five years now, no issues. Put together my own set via ACE Hardware.
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Old 12-17-2015, 04:15 AM   #45
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Quote:
Originally Posted by SoK66 View Post
I have run coarse thread grade 8s for five years now, no issues. Put together my own set via ACE Hardware.
the Synergy upper frame brace comes with a course thread bolt, no issues,
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Old 12-21-2015, 05:13 AM   #46
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Quote:
Originally Posted by SoK66 View Post
I have run coarse thread grade 8s for five years now, no issues. Put together my own set via ACE Hardware.
That was along the same lines I was thinking.
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Old 12-22-2015, 06:01 AM   #47
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I guess I jumped the bandwagon on this upgrade. I started my biuild in summer '09 and noticed the stock bolts were chewing up the track bar bracket holes. Switched to some grade 8 9/16" 'ers with keps nuts & hardened washers from the local Ace Hardware store and there were no furher issues. Over time I just swapped them all out. The available kits from Synergy & Northridge are probably less expensive than doing it the way I did.
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Old 12-31-2015, 11:11 AM   #48
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I ordered the front hardware from BoltDepot ( thanks wjfawb0), but noticed when I downloaded the installation instructions, Synergy also has a kit for the rear. Is anyone installing rear bolts as well?
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Old 12-31-2015, 11:35 AM   #49
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I believe the northridge set came with front and rear lower control arm bolts, nuts, washers (x8) as well as front and rear trackbar bolts, nuts, washers (x4). There also x2 14 mm bolts , nuts, washers for 2011-2012 front trackbar frame side mounts. I'm still not sure what these were supposed to be for. I have a 2015.
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Old 12-31-2015, 12:31 PM   #50
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You are correct. I saw the separate kit with tabbed nuts for the rear upper CAs and thought it was required in addition to the first kit referenced.

I suppose I can live without my nuts tabbed!
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Old 12-31-2015, 03:21 PM   #51
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Grade 8 or butter Bolts, make sure you are getting bolts made in the US and not the counterfeit Bolts (mostly from China) check Head stamps. Hey I it's my life and my kids lives I will defer to the best I can get. Same goes for brakes....
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Old 01-10-2016, 08:32 AM   #52
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Had the same issue on my 99 Cobra IRS. But my question is was the bolts changed in he 2015 models? Thanks and great write up.
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Old 01-14-2016, 09:08 AM   #53
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Is the axle side front track bar nut easy to get a wrench on? The factory one has that welded tab which eliminates the need to hold when tightening the bolt.
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Old 01-14-2016, 09:14 AM   #54
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Quote:
Originally Posted by Papabiker View Post
You are correct. I saw the separate kit with tabbed nuts for the rear upper CAs and thought it was required in addition to the first kit referenced. I suppose I can live without my nuts tabbed!
The uppers are a complete waste of money imo.
I did change all my lowers and track bars but because of mods i have a mix of stock and grade 8
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Old 01-14-2016, 09:16 AM   #55
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Is the axle side front track bar nut easy to get a wrench on? The factory one has that welded tab which eliminates the need to hold when tightening the bolt.
Harder to do with one person. You can wedge a wrench in there. The problem is getting it off after torquing to 125.
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Old 01-14-2016, 08:12 PM   #56
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A few weeks back I had the front axle universal joints replaced. A side of effect of this was no more bump steer, tighter steering, and much improved ride and drive quality. Why I thought? Because they tightened everything up during the process. I bought the north ride kit 2 years ago, and am lazy and have yet to put them on. I recently purchased a home and not only have a driveway, but a garage now. I can't wait to get under that thing and get these bolts on. Thanks for making this thread a sticky and in my conscience. Will be back with questions I'm sure!
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Old 01-16-2016, 11:14 PM   #57
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Is this install difficult?

I purchased the kit and don't even have a Jeep yet.
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Old 01-20-2016, 05:34 AM   #58
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Is this install difficult? I purchased the kit and don't even have a Jeep yet.
Ha NICE. No its not just do one arm/TB at a time. Dont torque the bolts until all are swapped out.
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Old 01-23-2016, 09:31 AM   #60
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Quote:
Originally Posted by SoK66 View Post
I have run coarse thread grade 8s for five years now, no issues. Put together my own set via ACE Hardware.
Same here...no issues.

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