Going to 40's :) - JKowners.com : Jeep Wrangler JK Forum
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post #1 of 26 Old 10-11-2013, 03:32 PM Thread Starter
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Going to 40's :)

I've been running 37 13;50 nittos for over a year now and they are getting low on tread (bought used). So I decided to step up to some 40's. Getting the Good Year Mtrs on Monday.

I'm sitting on the TF 4"lcg with flat fenders and have already trimmed some pinch seam. Hoping not to need to do too much extra. If I have to run some adjustable coilspacers or something I will.

Front end is inner and outer sleaved, Cs have been boxed in and I have the upgraded synergy ball joints.

I know I"m pushing it with 40's, but they are the same weights as my 37s, actually a couple pounds lighter. I plan on D60's in the next 6 months to a year and using this 44's under a hemi tj that I'm going to build for my boy.
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post #2 of 26 Old 10-11-2013, 03:44 PM
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Awesome! I wish I could do that, but Im stuck with 37"s since I cant go any taller at the house because of the garage.

You getting new tires this time?

-Hank
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post #3 of 26 Old 10-11-2013, 03:46 PM
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I sometimes wish I had stayed at 37s. The sacrifice in bump stop does not make me happy. Having the axles (mostly diffs) up higher has helped noticably in some spots. Not sure if I would go to 40s from 37s knowing what I know now. You will have to do significant cutting on the rear unless you are going to go extreme on the bump stop.

I have jeeps. I do shit to them.
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post #4 of 26 Old 10-11-2013, 06:27 PM
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Good luck, 40's are a whole different ball game vs 37's. Steering is likely going to be a problem unless you have 3" bs wheels and spacers.

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post #5 of 26 Old 10-11-2013, 08:44 PM
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post #6 of 26 Old 10-11-2013, 08:51 PM Thread Starter
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Well, I decided might as well go all in I'm upgrading shocks and coils for a 6" lift.
I hear ya on the garage issue, I was building my old home when I had a TJ with a 6 inch lift and 36's. I verified the height of the garage probably no less then 20 times. Yup, 7 foot. I informed them that "should" work since my jeep stood 6'11". Well they forgot about the 2" trim, so it didn't fit. Good thing I rolled it before the house was done

Yes, new tires this time, now that I have some more cash then before

Steering we may have to limit, but we were flexing it out as is and I still have a fair amount of room with my current setup and the mudgrapplers I have are a 13.5, but have heard they measure more like a 14.50.

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post #7 of 26 Old 10-11-2013, 09:08 PM
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Quote:
Originally Posted by ShizNizy View Post
I'm sitting on the TF 4"lcg with flat fenders and have already trimmed some pinch seam. Hoping not to need to do too much extra. If I have to run some adjustable coilspacers or something I will.
Quote:
Originally Posted by ShizNizy View Post
Well, I decided might as well go all in I'm upgrading shocks and coils for a 6" lift.
That didn't take you long!! haha. You could probably get away with 40's on 4" of lift depending on how much you're willing to trim.

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post #8 of 26 Old 10-12-2013, 08:10 AM Thread Starter
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That didn't take you long!! haha. You could probably get away with 40's on 4" of lift depending on how much you're willing to trim.
Yeah, but I had a real hard time deciding between the 4inch and 6inch when I first got my lift and going to 40's will make it so I can't fit in the automated car wash already so might as well go another 2inches.

It's not too much money to go from the 4 to 6 inch. The coils are only $300 and the shocks are $400. I have the stock teraflex shocks so I'm upgrading fox shocks.

I'll probably be able to get a little bit out of the 4inch coils and shocks, or at least that's what I told the wife And I was even able to sleep in the bed last night after telling her how much.

In my defense if it weren't for my Jeep in high school we would have never met.
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post #9 of 26 Old 10-12-2013, 08:48 AM
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You main issues is going to be the 6" coils. Running them is going to make your caster/pinion angle horrible. Years back I tried to run 6" springs, to keep the front pinion angle decent (read: no vibes) and caster was right around 2 degrees. Running that low of caster makes it have horrible road manners so just keep that in mind. My advise would be to run 4" coils, 2.5" of bump stop, a set of wheel spacers and trim what ever is left in your way... That's what I did. Now I'm running even lower, right around 2.5-3" of lift and 40's with plenty of up-travel, you just can't be afraid of cutting.

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post #10 of 26 Old 10-12-2013, 08:59 AM
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You can run the 40's on 4" of lift but you got to push the wheels out there pretty far or limit your steering. Stretching the front would be a big plus as well.

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post #11 of 26 Old 10-12-2013, 11:56 AM Thread Starter
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Quote:
Originally Posted by JK Vick View Post
You main issues is going to be the 6" coils. Running them is going to make your caster/pinion angle horrible. Years back I tried to run 6" springs, to keep the front pinion angle decent (read: no vibes) and caster was right around 2 degrees. Running that low of caster makes it have horrible road manners so just keep that in mind. My advise would be to run 4" coils, 2.5" of bump stop, a set of wheel spacers and trim what ever is left in your way... That's what I did. Now I'm running even lower, right around 2.5-3" of lift and 40's with plenty of up-travel, you just can't be afraid of cutting.



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Thanks for the heads up. I think I should be fine as when I had gears, sleeves, truss etc. My guy rotated the knuckles so hopefully the extra 2 inches shouldn't affect anything.

If I hate it, put my old stuff in and pull out the sawsall
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post #12 of 26 Old 10-12-2013, 03:15 PM
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VKS thats a lot of good info! Especially on stance for on road driving!

-Marc
2010 JKU -- 3.5" RE Lift -- EVO LCAs -- ARTEC Truss and TB mount -- 17" Procomp 7069 -- 37" Maxxis Treps -- Heated Trucklite Headlights -- Synergy Drag flip -- Synergy TR -- Synergy bj's-- EVO 1/4 Pounder -- EVO Tire Carrier -- 4 gal rotopax -- TF Third Row -- China AEV Snorkel

Coming up:
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post #13 of 26 Old 10-12-2013, 06:15 PM
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Quote:
Originally Posted by Homeless Hank View Post
Awesome! I wish I could do that, but Im stuck with 37"s since I cant go any taller at the house because of the garage.

You getting new tires this time?

-Hank
Give the garage a lift kit!
There! Problem solved!

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post #14 of 26 Old 10-12-2013, 08:39 PM Thread Starter
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Give the garage a lift kit!
There! Problem solved!
Or a winch front and rear hooked to the axels and just suck it down to pull into the garage
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post #15 of 26 Old 10-13-2013, 10:44 AM
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I went from 37's to 40's but I was planning on going to 40's when I started my build. I am running tge terafkex 6" Lcg kit. My jeep still fit in tge garage with about 1" clearance. You will need to trim the hell out of the the pinch welds. I am running 4"bs wheels and 1 1/2" wheel spacers. I still rub tge frame at full lock but not very hard just my side lugs rub. I have also pushed the front forward 1" and rear back 2" to min the cutting need to clear these beast. Also you will need to do hydro if you want to turn on the trails. I am running the rubicon d44's still but they are fully built. I pick my line wisely and stay out of the skinny peddle. Be prepared to go through front end parts especially ball joints. I am buikding a 60/70 the begining of the year. These tires will find a weak link. If I was to do it over I would of build 1 tons first.
Oh and my garage is standard height
I have 4.8 degrees of caster and converted the d44 to manual hubs. Drives and handles better than stock.


This was before trimming and redoing my bump stops with 40's





This after trimming and redoing my bump stops and pushing the front forwad 1" and the rear back 2"



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post #16 of 26 Old 10-14-2013, 12:10 PM
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I went to 40's about 2 weeks ago. This weekend I had to notch out the frame to make the tires clear when turned. Not a fun project, but necessary unless you stretch the front or run big spacers.

07 JKU, 14 bolt rear/ Teraflex 60 front, Tera Long Arm, King Coilovers, 40" MT/R-Ks, Antirock etc. 430HP LS3 engine swap. Cage and 14 bolt swap thread-
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post #17 of 26 Old 10-14-2013, 01:04 PM Thread Starter
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I went to 40's about 2 weeks ago. This weekend I had to notch out the frame to make the tires clear when turned. Not a fun project, but necessary unless you stretch the front or run big spacers.
Pics?

I'm just sitting at home waiting for the call that's its ready to pick up

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post #18 of 26 Old 10-14-2013, 04:31 PM
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I did something very similar to this.

https://www.jkowners.com/forum/showthread.php?t=35808

Theirs was prettier than mine though.

07 JKU, 14 bolt rear/ Teraflex 60 front, Tera Long Arm, King Coilovers, 40" MT/R-Ks, Antirock etc. 430HP LS3 engine swap. Cage and 14 bolt swap thread-
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post #19 of 26 Old 10-14-2013, 07:04 PM Thread Starter
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Well bad news....

My tires broke their tire mounting machine so they had to out source that along with the balancing so it wasn't able to get done today.

I should be able to pick it up during lunch tomorrow.
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post #20 of 26 Old 10-14-2013, 09:30 PM
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37" vs 42"
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stock rubi vs 42"
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post #21 of 26 Old 10-15-2013, 07:50 AM
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^ Lo2ay's rig right?


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post #22 of 26 Old 10-15-2013, 08:35 AM
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^ Lo2ay's rig right?
Sure looks like it.


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post #23 of 26 Old 10-15-2013, 08:59 AM
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Originally Posted by ShizNizy View Post
Well bad news....

My tires broke their tire mounting machine so they had to out source that along with the balancing so it wasn't able to get done today.

I should be able to pick it up during lunch tomorrow.
We call that foreshadowing...


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post #24 of 26 Old 10-15-2013, 11:56 AM
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^ Lo2ay's rig right?
Quote:
Originally Posted by LeftHandRubi View Post
Sure looks like it.
Yes

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post #25 of 26 Old 10-15-2013, 03:18 PM Thread Starter
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We call that foreshadowing...

If I break my axles I just get bigger ones sooner

I don't think they will be any harder on my axles then my heavy 37's were.
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