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Old 12-24-2013, 09:24 AM   #1
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Stock TJ - 265/75/R16 - New Owner

Greetings!

I am new to the forum (and forums in general) and TJ ownership. I just bought a stock 2004 TJ and am trying to make a few initial modification decisions.

- Can I run 265/75/R16's (31.6/10.43/R16) on my stock setup?
- If not will a 1.25 JKS body lift solve any issues I might have?

Thanks, Happy Holidays!!!

Metalcolt

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Old 12-24-2013, 09:33 AM   #2
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A big welcome to WF and Merry Christmas to you!

You can safely run 31" tires on an unlifted TJ, about the most you might need to do is to add a washer under the steering stop bolts as described at Jeep Steer Stop Adjustment to stop possible minor inside sidewall rub when the steering wheel is turned all the way to the left or right.

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Old 12-24-2013, 10:22 AM   #3
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I bought an 05 Rubi this summer and it had that size tires on it. I have not any issues. Jeep is not lifted.
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Old 12-24-2013, 10:54 AM   #4
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I just bought a 2000 tj and put 31x10.5x15 MT Baja ATZ P3's on it and have zero issues with clearance and rubbing, you'll be alright. Jeep is stock height and all
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Old 01-04-2014, 07:18 PM   #5
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Well, I think I will probably 2.5in suspension lift and tire size of 32-33 x 10.5 x 16 or 17. Since the Jeep will spend most of its life on pavement I am thinking a 17in wheel with the larger tires will be better for handling.

I will need to re-gear the diffs. when I up the tire size and because I do intend to do a little towing. I have used the formula below to figure out proper gearing.

Current Gear Ratio x New Tire Size / Stock Tire Size = New Gear Ratio.

3.07 x 32 / 28.3 = 3.47137 so, 3.56 gear ratio.

Do you think I would be better off doing 3.73 gears? Is there anything else I should consider are the stock drive shafts/u-joints strong enough, and should I do a diff overhaul at the same time? I am thinking yes on the complete diff overhaul.

My TJ is a 2004 Wrangler X Columbia Edition.

Thanks!
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Old 01-04-2014, 07:23 PM   #6
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Quote:
Originally Posted by Metalcolt View Post
Greetings!

I am new to the forum (and forums in general) and TJ ownership. I just bought a stock 2004 TJ and am trying to make a few initial modification decisions.

- Can I run 265/75/R16's (31.6/10.43/R16) on my stock setup?
- If not will a 1.25 JKS body lift solve any issues I might have?

Thanks, Happy Holidays!!!

Metalcolt
I'm sure you may have bought the new tires by now but my TJ has the BF Goodrich 265/75 r16's TA KO tires and as far as I can tell the PO's didn't modify anything. I haven't heard and grinding or rubbing so I think it can be done. What did you go with? That is if you did buy another set up!
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Old 01-04-2014, 07:28 PM   #7
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For 33s you will want to go with deeper gearing than 3.73, 3.73 wont be much of an upgrade over stock.
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Old 01-04-2014, 07:32 PM   #8
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You want 4.56 if you have the 5 speed.
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Old 01-04-2014, 08:52 PM   #9
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You want 4.56 if you have the 5 speed.
I do have the 5-speed, you don't think that 4.56 will be too short? I was thinking 4.11 max?
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Old 01-04-2014, 08:54 PM   #10
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My rig still needs to be very driveable at highway speeds.
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Old 01-04-2014, 08:57 PM   #11
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Cool air intake and throttle body spacers. Look into a lift kit and add bilstein 5100 series shocks to it )
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Old 01-04-2014, 11:03 PM   #12
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Cool air intake and throttle body spacers. ... )
Nope.
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Old 01-05-2014, 06:42 AM   #13
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For reference, Rubicons came from the factory with 31s and 4.10 gears. I have run 33s with both 4.10s and 4.56s. I prefer the 4.56s; however, my rigs are simply toys that are only driven for recreational purposes.

If you drive thousands of freeway miles every year at 75+ mph then maybe 4.10s will work better for you.
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Old 01-05-2014, 01:19 PM   #14
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For reference, Rubicons came from the factory with 31s and 4.10 gears. I have run 33s with both 4.10s and 4.56s. I prefer the 4.56s; however, my rigs are simply toys that are only driven for recreational purposes. If you drive thousands of freeway miles every year at 75+ mph then maybe 4.10s will work better for you.
Thank you for your opinion. I think I am going to settle with 32s so I think I will go with the 4.10.
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Old 01-05-2014, 01:36 PM   #15
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If you know you'll never go bigger than a 32" tire, 4.10 will be fine. If you think 33's are in your future, go with 4.56 now.
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Old 01-05-2014, 02:50 PM   #16
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Nope.
why nope?
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Old 01-05-2014, 03:20 PM   #17
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If you know you'll never go bigger than a 32" tire, 4.10 will be fine. If you think 33's are in your future, go with 4.56 now.
I think 32in is where I am going to settle. Mostly pavement driving with some off-road (not rock crawling), some towing but nothing crazy. I think that 32s with a 17in wheels will give me the right look and handling I am looking for.

Does anyone have objections to Michelin LTX AT/2s? I will be getting them in 265/70/17. I ran BFGs for years on my 7.3L F-250 and really liked them but I think for this car I would like something a little quieter with some more rubber on the ground.

Do you know if going from stock tire size and stock 3.07 gears to the new tires above and 4.11 gears is going to have a huge negative impact on my MPG? Or will it stay roughly the same?

Thanks!
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Old 01-05-2014, 04:16 PM   #18
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So, after doing some reading it looks like I have a Dana 30 in the front which can be changed from 3.07 to 4.10 gears. And a Dana 35c in the rear which can be changed to 4.11.

Is it a problem to be running 4.10 in the front and 4.11 in the rear? Also, if I am going to make a change to 4.11 in the back should I use 75w-140 instead of 75w-90?

Thanks, everyone you are helping to make this process of getting to know my new vehicle much easier!
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Old 01-05-2014, 04:28 PM   #19
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4.10/4.11 is normal for that ratio. A .01 ratio difference between the front and rear is normal for when the front/rear axles are different. 3.73/3.74, 4.55/4.56, 3.87/3.88 etc. and is due to the difference in ring gear diameter differences. It doesn't matter on the street because you're in 2wd and the front axle isn't driven. In 4x4, you're on loose traction surfaces so the front/rear tires slip against each other.

And even if they were exactly the same it wouldn't matter because simply turning the steering wheel left/right makes the front tires rotate faster than the rear tires anyway.

No need to change lube viscosity when going to a different ratio. Proper axle lube viscosity depends on the type of loads the axles will see and to a lesser extent, ambient temperature conditions. For most conditions, a 75W-90 is fine. A heavier viscosity like 80W-120, 85W-140, etc. is recommended for extreme wheeling conditions or if you tow a trailer a lot.
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Old 01-05-2014, 04:34 PM   #20
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I also have the D30/D35 with 307. Can you provide a link to what you were reading on this? Anyone do a write up for dummies on this? Regearing may be in my near future, but each time I search for this topic I seem to find conflicting info.
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Old 01-05-2014, 04:41 PM   #21
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4.10/4.11 is normal for that ratio. A .01 ratio difference between the front and rear is normal for when the front/rear axles are different. 3.73/3.74, 4.55/4.56, 3.87/3.88 etc. and is due to the difference in ring gear diameter differences. It doesn't matter on the street because you're in 2wd and the front axle isn't driven. In 4x4, you're on loose traction surfaces so the front/rear tires slip against each other. And even if they were exactly the same it wouldn't matter because simply turning the steering wheel left/right makes the front tires rotate faster than the rear tires anyway. No need to change lube viscosity when going to a different ratio. Proper axle lube viscosity depends on the type of loads the axles will see and to a lesser extent, ambient temperature conditions. For most conditions, a 75W-90 is fine. A heavier viscosity like 80W-120, 85W-140, etc. is recommended for extreme wheeling conditions or if you tow a trailer a lot.
Thank you Jerry for the info. I thought that may be the case.
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Old 01-05-2014, 04:43 PM   #22
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I also have the D30/D35 with 307. Can you provide a link to what you were reading on this? Anyone do a write up for dummies on this? Regearing may be in my near future, but each time I search for this topic I seem to find conflicting info.
Ryan - Here is some TJ Spec. info.

http://www.jeepforum.com/forum/f9/st...ations-452871/
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Old 01-05-2014, 05:00 PM   #23
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That's a good start, thanks.

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