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Old 10-08-2012, 10:41 AM   #1
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Question 2.5" BB lift vs 2.5" coil lift

I do apologize if there is an in-depth comparison of these two kits but I cannot seem to find one that compares the real world differences of the two kits. I am looking to lift my 2012 JK but having a hard time deciding between the two. From what I've learned talking to a Teraflex rep, if I get the 2.5" BB I should upgrade my shocks whereas the 2.5" coil lift will do with just the adapters since my JK shocks are new. He also stated the 2.5" coil kit will give a better ride (less side to side motion) and be better long term performance.

My question is what are the real world difference between the two, and will I see a big difference for the extra money? My Jeep is a DD but trying to take trails on weekends when I can. Also concerned by someones comment in a lift thread about the coil lift possibly voiding a warranty where as the BB will not since its just a spacer and nothing being bolted on.

He also recommended I should purchase the exhaust spacer and steering damper (I assume for both kits)... any other recommendations to purchase as well?

Thanks for the help guys... new to this stuff so any help is appreciated

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Old 10-08-2012, 10:44 AM   #2
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**Also, what size wheel spacers will I need since I plan on using my stock rims with 35" tires? thanks!

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Old 10-08-2012, 11:22 AM   #3
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You can upgrade the shocks with either the BB or spring lift. Both kits offer adapters.
If you have the money I always would rec the spring lift, Esp with 35's.
Are you going to be adding weight ie, bumpers/winch? The softer stock springs won't handle the weight and sag. Not good with 35's.


Spacers are needed to help bigger tires clear suspension parts.
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Old 10-08-2012, 11:39 AM   #4
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Thanks KJEEPER! Yes, I just bought the Rampage recovery bumper, no winch yet...
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Old 10-08-2012, 11:44 AM   #5
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Quote:
Originally Posted by DozerJK
Thanks KJEEPER! Yes, I just bought the Rampage recovery bumper, no winch yet...
NP

Then yes, you are better off with the coil lift.
TF offers adapters but I would def save up for some nice shocks.

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Old 10-08-2012, 11:52 AM   #6
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Yes definitely going to eventually replace them with the Bilstein 5100s eventually, but hoping to get by with the stock for now (or pick up some used Rubicons on CList/forum)...

Thanks again for helping with the decision, always easier swallowing the wallet hit with other people making the decision for some reason ha...
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Old 10-08-2012, 12:05 PM   #7
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Quote:
Originally Posted by DozerJK View Post
From what I've learned talking to a Teraflex rep, if I get the 2.5" BB I should upgrade my shocks whereas the 2.5" coil lift will do with just the adapters since my JK shocks are new.
False.

2.5" of lift is 2.5" of lift regardless of whether it's achieved by spacers or longer coils. The resting position of your shocks will be 2.5" taller either way, and when you flex an axle, the shock will have 2.5" less space to stretch than it would have otherwise.

Whether in a BB or a coil lift, you can use adaptors or replacement shocks to make up for the lost 2.5".

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Originally Posted by DozerJK View Post
He also stated the 2.5" coil kit will give a better ride (less side to side motion) and be better long term performance.
Depends. He seems to be referring to "body roll," in which case I agree with him. The BB will be closer to the stock ride, whereas the coil lift is giving you new stiffer springs.

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Originally Posted by DozerJK View Post
My question is what are the real world difference between the two, and will I see a big difference for the extra money?
They both give the same appearance, and they both raise your undercarriage 2.5" higher. So if it's looks and some extra underbody clearance is what you're looking for, then a BB is the cheapest way to get there.

The coil lift has the added benefits of being better able to handle added weight (i.e., bumpers, winch, etc.), providing a better ride (i.e., less body roll), and being better suited to flexing offroad.

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Also concerned by someones comment in a lift thread about the coil lift possibly voiding a warranty where as the BB will not since its just a spacer and nothing being bolted on.
False. Your warranty does not cover what's replaced or what's damaged by what's replaced. That's it.

So Chrysler will not cover your new spacers (or new coils), your new shocks (or adapters), or anything else that's added with the lift (brake line extensions, etc.). Chrysler will also not cover anything damaged by the lift. A 2.5" lift shouldn't damage anything you're not already replacing (i.e., shocks), so that's a non-issue.

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Originally Posted by DozerJK View Post
He also recommended I should purchase the exhaust spacer and steering damper (I assume for both kits)... any other recommendations to purchase as well?
A new steering damper is pretty but absolutely unecessary. Most folks running 2.5" lifts (like myself) have not replaced their factory steering damper.

An exhaust spacer is recommended for either kit for the 2012+ model years. I forget what the magic number is, but there's a certain length of shock that most folks with 2.5" of lift have that allows for a certain amount of flex of the rear suspension, and when you flex to that point, other components will make contact with your exhaust system unless you install the spacer. I'd plan on getting that.
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Old 10-08-2012, 12:36 PM   #8
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thanks MTH... appears I should go the coil route, because its only $150 more and you have more benefits. I also already have a new Rampage stubby bumper (~100lbs) and I dont want any slumping.

Any idea on the size wheel spacer I would need for the factory 17" rims?
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Old 10-08-2012, 12:43 PM   #9
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SpiderTrax spacers come only in 1.5" widths, and that's what I'd get. Also consider just going to a smaller wheel with proper backspacing so as to moot the need for spacers altogether.
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Old 10-08-2012, 12:47 PM   #10
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So if you go the coil route, the reason you should get new shocks is that the new ones will be a couple inches longer and provide more compression in the depth. What's the difference between the shocks provided by TF in their complete 2.5 package and getting Bilstien 5100's?

For what it's worth, my JKU is a DD as well, and I plan to stick to 33" Duratracs, so I'm focused on best on road performance first, and not having problems off road second.
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Old 10-08-2012, 12:48 PM   #11
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I considered that, and eventually will, but to save some money for now I figured spacers would be cheaper...
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Old 10-08-2012, 01:06 PM   #12
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Quote:
Originally Posted by WhiskeyMike
So if you go the coil route, the reason you should get new shocks is that the new ones will be a couple inches longer and provide more compression in the depth. What's the difference between the shocks provided by TF in their complete 2.5 package and getting Bilstien 5100's?

For what it's worth, my JKU is a DD as well, and I plan to stick to 33" Duratracs, so I'm focused on best on road performance first, and not having problems off road second.
Both are a HD shock. I tried both and hated the ride. I went with adjustable Rancho 9000's and love them.
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Old 10-08-2012, 01:10 PM   #13
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Quote:
Originally Posted by WhiskeyMike
So if you go the coil route, the reason you should get new shocks is that the new ones will be a couple inches longer and provide more compression in the depth. What's the difference between the shocks provided by TF in their complete 2.5 package and getting Bilstien 5100's?
.
If he gets spacers, the shocks will still need to be a few inches longer.
The difference is more then likely quality. I just paid $300 for some 5100s alone. I'm not sure what the price is on the TF kit, but usually the shocks with kits arent the best. IMO.
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Old 10-08-2012, 01:10 PM   #14
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SpiderTrax spacers come only in 1.5" widths, and that's what I'd get.
The SpiderTrax actually come in a 1.75" now too... just an fyi
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Old 10-08-2012, 01:13 PM   #15
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Quote:
Originally Posted by 04ORX

If he gets spacers, the shocks will still need to be a few inches longer.
The difference is more then likely quality. I just paid $300 for some 5100s alone. I'm not sure what the price is on the TF kit, but usually the shocks with kits arent the best. IMO.
Not if he uses the extensions.
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Old 10-09-2012, 01:01 AM   #16
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Not if he uses the extensions.
ah, thats right we are talking about a JK here...

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