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Mopar spring specs, where do you get them?

19K views 63 replies 6 participants last post by  d_rick 
#1 ·
Hi,

I need to get the specifications for this spring:

Mopar part # - 5212-6317AC

I'm trying to get the correct coils for my lift kit, and the company wants to know what came on the rig stock.

Already tried Google, where i can find all kinds for sale - with no specs.

Tried local dealership, they had no idea (and lectured me for actually ASSUMING they would).

On Jeep chat now, but they are stating they don't have them either??
 
#2 ·
Wtf???



So Jeep chat followed up, and they stated they don't have them either?

Someone explain this to me...

Jeep has a catalog of parts for their vehicles, which i can order this spring from. BUT, neither their dealership parts counter or Jeep themselves can explain what the part actually is?

Does that seem odd to anyone else?

:atomic:
 
#3 ·
First off why do they need to know your spring #?

FWIW #17 (last 2 numbers in the PN) front spring is run of the mill front for 4dr usually but not always dual top Sahara unlimited. There are no definitive # that Match specific builds. All we know is that there is roughly 1/8" height difference between PN .

#19 is the heaviest/tallest front spring
#60 is the heaviest/tallest rear spring
 
#4 ·
But now the 10a is numbered different and is a tad longer than 19/60 coils. I posted a photo at one time comparing them.
 
#5 ·
Also if you are going to order them I would get aftermarket coils as you will get a better ride with many of them and rock krawler triple rates are only $125 a pair from northridge4x4
 
#8 ·
that is exactly what i'm trying to do.

oem's are on the rig now, they will be replaced by whatever BDS includes in their lift kit (which should be a bit stiffer), then everyone seems to think i need to stiffer yet due to the weight.

the last part is where it falls apart
 
#11 · (Edited)
Here... not sure this will help. One member here gathered OE front spring specs.. see his attachment in post #60. I also attached it below. Its incomplete and only covers front springs, but you may be able to make some assumptions based on the incremental changes in spring height.

You also may want to review the entire thread to get a better read on what's available.

http://www.wranglerforum.com/f274/prepping-for-006aa-009aa-spring-swap-1051385-2.html#post18174041

Not sure why he indicated 77070091 is a front spring... According to Mopar America that's a rear spring.

http://www.moparamerica.com/oe-mopar/77070091

.
 

Attachments

#12 ·
Here... not sure this will help. One member here gathered OE front spring specs.. see his attachment in post #60. I also attached it below. Its incomplete and only covers front springs, but you may be able to make some assumptions based on the incremental changes in spring height.

You also may want to review the entire thread to get a better read on what's available.

http://www.wranglerforum.com/f274/prepping-for-006aa-009aa-spring-swap-1051385-2.html#post18174041

Not sure why he indicated 77070091 is a front spring... According to Mopar America that's a rear spring.

COIL SPRI-REAR | Genuine Mopar | 77070091

.
wow, i'm on page 2 and my head is swimming.

honestly the reason i'm paying a shit ton of $ for all this work is so i don't have to engineer all this on my own. i was thinking that since literally everything i've thought of so far has been done my about 100 guys, this might fall into the same category.

it sounds like this however is somewhat of a "black box" as neither Jeep, lift mfr, or the spring guy know the answer.

maybe i should just run the BDS's and HOPE they actually did the work to get it "right"?

:hide:
 
#20 · (Edited)
This whole thread has me perplexed... Who cares which stock spring I had? Unless I am leaving 100% of everything else completely stock, like no bumpers or anything, it's completely irrelevant.

BDS is a low end lift with linear rate springs... If you are building a Jeep with aftermarket bumpers, etc consider multi rate spring like RK's, MC's or JKS's.

I think you're overthinking it with almost no impact on the results... I mean no disrespect, but if you're that in to it and the results, move up to a more premium lift.

Edit to add... Looking at that JS chart, a 4" lift spring with only a 20" free length isn't all that great. That would limit droop too much for me. My 2.5 RK's have more droop than that. The ability to droop, directly effects the amount of flex you can generate "safely".
 
#26 ·
no disrepect taken @Pressurized (your post came in after i had replied before, sorry.)

so let me ask you this, if i went to multi rate spring like RK's, MC's or JKS's is it safe to assume that they would be able to tell me what spring i need, or at least discuss it more intelligently without sending me back down the rabbit hole?

thanks for the information
 
#28 ·
The coils that BDS come with stock will be no match for a coil like rock krawler triple rates. Lots of good companies out there. If you want the best riding loaded down wrangler I would sell your BDS kit and go full aev or rock krawler.there are others too that will ride better
 
#30 ·
Yes and thru northridge4x4 with forum discount 125 shipped
 
#34 ·
Long arms are control arms
 
#36 ·
I am not sure why maybe I missed it that you are married to bds. Reading your intended use again you really should explore the aev 3.5" lift. I wheel with guys who have them they do great on road and in all but the most extreme off road. They breeze thru things like the rubicon trail and 7 and 8 rated Moab trails. They are complete and handle weight. I would not be so intent on piecing together a better bds lift it does not make sense to me.
 
#37 ·
you didn't miss it, allow me to explain.

all of this work is being done by a local shop. previous experience with this shop has shown me that my risk factor goes up when i push them outside their comfort zone. they are a BDS shop, and as such recommended the house brand. the 4.5" LA kit is sitting in a box on the shop floor right now, so that further complicates this whole thing.

after this mornings call with JKS and their dealer (who said pretty much the same thing you just did), i actually am feeling much better about my choices.

here is the bottom line.. I'm new to most of this, and as some of you know have spent the last 6+ months trying to learn as much as possible here and elsewhere on how to make the fewest mistakes possible on my build. so far it has worked out pretty good (well except for my brief time on 35's, but that is another story). i take feedback offered here, from my friends, and from a few Facebook groups to form my opinions which i then usually run by a few shops to get their input on.

before today 5/5 shops have recommended LA kits, 2/5 said BDS is good kit and i would be happy. however, the shocks and springs are not going to work. this then opens the door for me to reconsider my decision BEFORE it gets installed and i'm stuck with it.

having said all that, for all i know i might install the BDS kit as is and everything would be super-fantastic. for some reason, i just don't feel good about that right now.

hope this helps?
 
#38 · (Edited)
@d_rick forgive me as I had forgotten you were looking at long arms... FORGET the brackets I mentioned as your arms are fully adjustable and will correct your caster when installed properly. That 4.5 LA kit does use a drop pitman arm which I would replace with a Yeti drag link flip which is much better quality.

So lets discuss further... Are you looking to use their long arm set with a lower spring height? Maybe the BDS LA kit with the JKS 3.5 springs for example? I could see that being a nice build up with the FOX clickers...
 
#39 ·
@d rick forgive me as I had forgotten you were looking at long arms... FORGET the brackets I mentioned as your arms are fully adjustable and will correct your caster when installed properly. That 4.5 LA kit does use a drop pitman arm which I would replace with a Yeti drag link flip which is much better quality.

So lets discuss further... Are you looking to use their long arm set with a lower spring height? Maybe the BDS LA kit with the JKS 3.5 springs for example? I could see that being a nice build up with the FOX clickers...
man, you threw me for a loop @Pressurized as i usually take your comments and feedback pretty seriously.

that is exactly what the current game plan is, i just need to decide between two more things (unless you guys throw me any more curve-balls).

1. do i get the RK or the JKS springs?
2. whether or not i want to add these fancy things or not (JKS and their dealer recommended, RK did not obviously)?

Wrangler Adjustable Coil Spacer Lift Kit | Wrangler JK Coil Spacer

Wrangler Adjustable Coil Spacer Lift Kit | Wrangler JK Coil Spacer
 
#40 ·
I personally would not add the adj spacers too much money for what they do.
 
#43 ·
Like pressurized I have no experience with jks coils I do however with rk and they do well on and off road. JKS has a good reputation. If money is no object check out their control arms too.if you are not going to hardcore off road might be a better option than arms too.
 
#52 ·
Just talked to RK, looks like it is:

175 F
215 R

This compared to RE which are:
RE1372
Front4.5" JK 4 dr/ 5.5" JK 2 dr185 lbs/in
RE1377
Rear4.5" JK 4 dr/ 5.5" JK 2 dr230 lbs/in
---

This begs the question as to whether i should focus on the springs alone, the shocks alone, or both however?

Thoughts?
 
#55 ·
I had the rates in a PM, but as I recall the Rancho 3.5 progressive spring had a higher rate than most of the others I compared them to.

RS66110B-1

You could PM Matt @Rancho and see if he could get them for you.
 
#61 ·
Fun with springs - continued

So - after running my Frankenlift for a while, it appears i have some more work to do with the coils.

After re-reading this entire string to remember what I've already done & learned - and adding in my real life results here is where i find myself.

The spring / shock combination is still too soft, and as i wait for the replacement shocks to arrive in December, am seriously contemplating replacing the RK's with the RE's now to test how much this helps my problems.

This will net me three things (i think):

-remove the coil spring spacers as the RK's are made for a 3.5" lift and i have a 4.5" lift
-add +10lbs of stiffness in the F, and more importantly +15 in the rear
-add some more stiffness in before i add yet more weight with the roll cage which is going to make my problem worse

Anyone have any additional thoughts on this before i start tinkering again?

TIA
D
 
#62 ·
So - after running my Frankenlift for a while, it appears i have some more work to do with the coils.

After re-reading this entire string to remember what I've already done & learned - and adding in my real life results here is where i find myself.

The spring / shock combination is still too soft, and as i wait for the replacement shocks to arrive in December, am seriously contemplating replacing the RK's with the RE's now to test how much this helps my problems.

This will net me three things (i think):

-remove the coil spring spacers as the RK's are made for a 3.5" lift and i have a 4.5" lift
-add +10lbs of stiffness in the F, and more importantly +15 in the rear
-add some more stiffness in before i add yet more weight with the roll cage which is going to make my problem worse

Anyone have any additional thoughts on this before i start tinkering again?

TIA
D
Interesting - even thought the RE springs are made for 4.5" lifts, the coils are actually "shorter" than the RK's? I was thinking that if i went to a specific spring made for 4.5" lift, it would be longer and i could get rid of the spacers?

What am i missing here?

RK Springs
Part Lift Height Free Length
RK02001 3.5" 21.00"
RK02002 3.5" Triple Rate Rear Coil 18.575"


RE Springs
Part Lift Height Free Length
RE1372 4.5" 20.25"
RE1377 4.5" 17.4"
 
#63 · (Edited)
the beauty of triple rates is you have greater free length and the weight of your vehicle collapse the first few coils so they have no effect on ride but are longer when free so they don't pop out when fully drooped. the longer free length of the rk wont mean you have more actual lift vs the shorter free length of the RE. If you are into flexing might need coil retainers with the RE's tho
 
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