Lift kit questions from a newbie - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 18 Old 02-15-2009, 06:33 PM Thread Starter
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Lift kit questions from a newbie

Greetings all. I'm new to this forum and a proud owner 09 JK x 4dr. I've been a jeeper for most of my life. Started out with a completely trashed cj2 that I dearly loved until it literally fell apart (frame broke in half on a trail ride). After the 2a, I had 3 cj3b's only one ran, the other two were for parts. Then a 75 cj5. Then an 81 cj8 scrambler. While I still had the cj8, I bought a brand new 86 cj7. Sold both of them in 2003 and bought a new tj. Last week I sold the tj and got the jk 4 door.

Looking forward to the customization phase. I have a lift question. I've got a set of 35/12.50/r15 Trxus MT tires that I want to put on the JK. Can I accomplish this with a TF 2.5 BB. This will be primarily a daily drive with light duty weekend wheeling. Wondering about potential rub areas. Also any problems with 15x10" steel wheels, back spacing is 4". Will they rub the calipers? Thanks in advance for your replies.
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post #2 of 18 Old 02-15-2009, 06:42 PM
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you can do 35's with 2.5"

I run 15's but they are 8". I have 4.75" BS and they rub slighty on the calipers. They are steel wheels. I imagine you should have no issue at all with 4" even if they are thicker wheels. What kind of wheels are they?

If you end up running them and they fit fine will you post the info in this thread for others?
https://www.jkowners.com/forum/showthread.php?t=510

BTW, welcome to the forum!
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post #3 of 18 Old 02-15-2009, 06:59 PM Thread Starter
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Thanks for the reply. I've got the tires now, but haven't yet bought the wheels. I can get a good deal on a lightly used set of Unique Wheels. Heres thier website http://www.uniquewheel.com/catalog_pg2.html . It may be a month or so b4 I can get the lift. Will I be able to put the tires on for light street driving or do I need to wait for the lift kit. I'm really itching and twitching to get these 35's out of my garage and back under a jeep where they belong.
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post #4 of 18 Old 02-15-2009, 07:03 PM
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have seen pictures where people put 35's on with no lift. YOu should be able to do it but I do not know if it will rub while cornering or going over bumps.

YOu will probably have to remove or trim the air damn deal (the plastic below the bumper)
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post #5 of 18 Old 02-17-2009, 01:08 AM Thread Starter
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One thing I 4got 2 mention is my new jk has 3.73:1 gears. I'm thinking the stock meshers are too tall for 35's. Plan is to ultimately move up to 4.56:1's or 4.88:1's. Tranny is auto. Whaddauthunk, 95% dd in a very small town of 4k souls, 5% fun runs on class 1/2/3 trails. I don't wanna break it anytime soon. If I had my rathers, I'd go with 33's but I already have the 35's sitting in my gargae taking up valuable space and I really want them like an 18 y/o wants a porn star. How bout a 1: body lift for a hundy, will that keep me moving.
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post #6 of 18 Old 02-17-2009, 01:24 AM Thread Starter
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Thanks for the reply. I'll check out the pictures. How's things in Killeen, I used to live in Beaumont (way East) but my uncle lived in Copperas Cove, Awesome turkey and deer hunting. His ranch backed upto Ft Hood. Many good times down that way. Best pawn shops in the world.
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post #7 of 18 Old 02-17-2009, 09:53 AM
 
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personally the least expensive way out of this and still having some quality is do what alot of people do and go w/ the TEREFLEX 2.5BB Now with the wheels. Kinda rule of thumb is anything with a higher than 4.25 backspacing is gonna rub w.o running some spacers. I would go at least 1.25" SPIDERTRAX. Other than that regear so your JK will be able to move w/o having to overwork itself. BUT thats just me
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post #8 of 18 Old 02-17-2009, 10:13 AM
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The Teraflex budget boost works great with 35's. The bump stop extensions the kit comes with keep the rubbing to a minimum. I ran it with 35's myself.

As far as wheels, some 15" wheels are known to rub the calipers but most of them work fine. If you do have a little rubbing some guys have just taken a little meat off the caliper for clearance.

You wont need any type of a spacer as long as the wheels you get have at least 5" of backspacing.

Jason
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post #9 of 18 Old 02-17-2009, 10:18 AM
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Quote:
Originally Posted by SDMF View Post
You wont need any type of a spacer as long as the wheels you get have at least 5" of backspacing.
Just to clarify what SDMF said...if you do end up with 15's, you would need a minimum of 4.5"-4.75".

Last edited by WTF_LOL; 02-17-2009 at 03:26 PM.
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post #10 of 18 Old 02-17-2009, 10:28 AM
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Quote:
Originally Posted by WTF_LOL View Post
Just to clarify what SDMF said...if you do end up with 15's, you would need a minimum of 4.5"-4.75". I have 4.75" with steel 15's and rubbed my calipers. Would prefer at least 4.5"
Someone correct me if I an wrong, cause I am wrong often, but backspacing doesn't have anything to do with the rubbing on the caliper.

Jason
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post #11 of 18 Old 02-17-2009, 10:35 AM
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Quote:
Originally Posted by SDMF View Post
Someone correct me if I an wrong, cause I am wrong often, but backspacing doesn't have anything to do with the rubbing on the caliper.
It does...or at least it can. There are other factors to consider as well. I have about 1/8" cleareance betweeen the face of my calipers and the back side of the wheel. If there was about a 1/4" or more BS I would have more breathing room there.

Some of the biggest concerns with BS are related to hitting the rear sway bar and rubbing arms and such in the front
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post #12 of 18 Old 02-17-2009, 10:45 AM
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This picture will help me describe wht I am saying.



Backspacing would be the distance from the mounting surface of the wheel to the peice across the top.

Sometime manufactures just build up the mounting surface which moves the wheel away from the calipers just like a spacer would do.

Sometimes though, they just move that whole surface back which then would not help your clearence based on Back spacing

That is exactly why I am surprised there is not another measurment we use. Wheel width makes since and so does Backspacing or Offset. I am surprised there is not also a spec that identifies where that rear of the wheel (where calipers would hit) is located. Would take a lot of the guessing game out of it
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post #13 of 18 Old 02-17-2009, 10:56 AM
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I was posting a very similar pic. The reason I said backspacing shouldn't matter is because it is measured to the face of mounting surface. It's the design of the mounting surface that effects the clearance to the front of the calipers. The procomp 16" steel wheels that I have only clear the front of the calipers by about a 1/16 of an inch.

Jason
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post #14 of 18 Old 02-17-2009, 11:15 AM
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Quote:
Originally Posted by SDMF View Post
It's the design of the mounting surface that effects the clearance to the front of the calipers.:
I completly agree with you! YOu certainly can not know if a wheel will work based on the BS alone. Only reason I said that earlier was because, as far as I am aware, there is not a 15" wheel out there that will fit that has less then 4.5" BS

BTW, I am going to edit my earlier post, I said 4.5 to 4.75 backwards
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post #15 of 18 Old 02-17-2009, 02:31 PM Thread Starter
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Ok, now I more confussed. You're saying that the less BS, the more likely of contact with the calipers. I.E. 3.75" of bs will rub but 5" won't. That doesn't make sense to me. A wheel with 3.75 bs sticks out further from the axle flange, thus reducing the likelyhood of the tires rubbing on control arms and sway bars during a turn. Also the inner portion of the wheel has an inward taper. Widest at the edge of the wheel and narrowest at the wheel center hub. It is because the rotor on the jk is larger than the rotor on the tj and the caliper is outside of the rotor. Therefore, if the caliper has to set deeper into the wheel, the more likely of caliper rub. On the wheel with 3.75 bs, the caliper is closer to the edge where the wheel is widest. With the 5" bs wheel, the caliper is set deeper into the wheel where the internal diameter if the wheel is narrower. Am I wrong here?
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post #16 of 18 Old 02-17-2009, 02:41 PM
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Sorry we confused you. As far as rubbing control arms/sway bars/bumpers/fenders/etc, anything with less that 5 and you will be fine (5, 4.75,4.5,4.25,4,3.75 etc). But as also discussed, some wheels mounting surface design interfere with the calipers.

Jason
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post #17 of 18 Old 02-17-2009, 02:52 PM Thread Starter
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Oh, ok now I got it. I didn't read ur reply carefully enough the first time. ["It's the design of the mounting surface that effects the clearance to the front of the calipers"]. front being the key word.
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post #18 of 18 Old 02-17-2009, 03:26 PM
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I think that was my fault. I am at work and doing to many things at once. I got it all bass akwards in which way moves the wheel farther out. sorry, lol
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