Quadradrive II Transfer Case / Tire Size Question - Jeep Commander Forums: Jeep Commander Forum
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post #1 of 65 (permalink) Old 04-16-2009, 07:23 AM Thread Starter
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Quadradrive II Transfer Case / Tire Size Question

I have MT ATZ 245/70/17 on my vehicle, and at a jeep event on the weekend here in Australia I damaged the side wall and could not get a new tyre (this is not a common size over here). I had the option of getting an original 245/65/17 but someone said if you have different tyres on with QD II you will stuff the diffs in no time at all, so much so that you have to have similar tread wear on both sides. If it is that sensitive it would mean you have to buy 2 tyres if you damage one that is over half worn. Does anyone know if this correct?

2007 Midnight Blue, 3.0L CRD, 2" Lift, Bullbar, Mickey Thompson ATZs (30.5").
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post #2 of 65 (permalink) Old 04-16-2009, 07:58 AM
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I'm not sure about the difference in circumference, but I wouldn't run just one. I would recommend getting at least two and keeping them on the same axle, but I'm sure others will have more insight.

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post #3 of 65 (permalink) Old 04-16-2009, 08:16 AM
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I don't think it will make damage in short time as the difference is not that big.. but if I were you I wont put a different size tire permanently !

Other option is possible to put 265/65/17 which very very close to 245/70/17 in circumference (only 0.19" difference) and the difference in height is negligible too (only 0.3") .. but its wider !

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post #4 of 65 (permalink) Old 04-17-2009, 07:37 AM
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I had a nail in my side wall. I knew not to change just one tire. I wasn't sure about only putting on two. So I got 4 new ones. I was going to need all four tires with in 12 months anyway.

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post #5 of 65 (permalink) Old 04-17-2009, 03:39 PM
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is the spare the same size? if not then it shouldnt be a problem.

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post #6 of 65 (permalink) Old 04-17-2009, 07:23 PM
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Quote:
Originally Posted by keef_7 View Post
I have MT ATZ 245/70/17 on my vehicle, and at a jeep event on the weekend here in Australia I damaged the side wall and could not get a new tyre (this is not a common size over here). I had the option of getting an original 245/65/17 but someone said if you have different tyres on with QD II you will stuff the diffs in no time at all, so much so that you have to have similar tread wear on both sides. If it is that sensitive it would mean you have to buy 2 tyres if you damage one that is over half worn. Does anyone know if this correct?
From the Owner's Manual (note: QDII uses the QTII transfer case):

Quadra-Trac II Operating
Instructions/Precautions — If Equipped
The Quadra-Trac II transfer case is fully automatic in the
normal driving 4 HI mode. The Quadra-Trac II transfer
case provides three mode positions — four wheel drive
high range, neutral, and four wheel drive low range.

This transfer case is fully automatic in the 4 HI mode.
This transfer case divides engine torque almost evenly
with 48 percent of engine torque to the front axle and 52
percent of engine torque to the rear axle. When speed
differences are increased between the front and rear drive
shafts, the transfer case can transmit up to 100 percent of
available engine torque to the front or rear drive shafts.

When additional traction is required, the 4 LOW position
can be used to lock the front and rear driveshafts together
and force the front and rear wheels to rotate at the same
speed. The 4 LOW position is intended for loose, slippery
road surfaces only. Driving in the 4 LOW position on dry
hard surfaced roads may cause increased tire wear and
damage to driveline components.

When operating your vehicle in 4 LOW, the engine speed
is approximately three times that of the 4 HI position at a
given road speed. Take care not to overspeed the engine
and do not exceed 25 mph (40 km/h).

Proper operation of four wheel drive vehicles depends on
tires of equal size, type, and circumference on each
wheel. Any difference will adversely affect shifting and
cause damage to the transfer case.

Because four wheel drive provides improved traction,
there is a tendency to exceed safe turning and stopping
speeds. Do not go faster than road conditions permit.

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post #7 of 65 (permalink) Old 04-17-2009, 08:41 PM
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How do you get that info 5253? Are you typeing all that from the manual?

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post #8 of 65 (permalink) Old 04-18-2009, 08:39 AM
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Quote:
Originally Posted by Ranger6882 View Post
How do you get that info 5253? Are you typeing all that from the manual?
I assume he did a copy and past out of the PDF version of the manual. There is a link to it somewhere and I guarantee he will find it for you!!!!

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post #9 of 65 (permalink) Old 04-20-2009, 03:54 AM Thread Starter
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Thanks for that 5253. It would be interesting to know how much leeway there is in the circumference requirement, at what point of tread wear do you need to buy more than one tyre due to ruining one. ie. after 10% wear, 30%, 50%?

2007 Midnight Blue, 3.0L CRD, 2" Lift, Bullbar, Mickey Thompson ATZs (30.5").
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post #10 of 65 (permalink) Old 04-20-2009, 01:34 PM
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I'm not the most knowledgeable on this, but in the QDII there are clutches in the transfer case and both axles that drag all the time. That is why we need those additives in the fluid to prevent the strange noises and premature wear. I doubt there will be a published spec, but the less the difference in tire size, the less difference rotational speed of the drive train, the longer everything will last.

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Rocky Road 2.25" Lift,
Spidertrax 1.5" Wheel Spacers,
265/70R17 Bridgestone Dueler A/T RH-S
Gibson 3" SS Exhaust
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