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Old 09-06-2013, 12:12 AM   #1
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3.21 manual with Duratrac 285/75r16?

Just got a 13 2d base model 6 speed with hard top. I knew I wanted to replace the 225/75/16 tires and wheels. The salesman said I'd have no problem up grading to 35's without getting into regearing or needing a lift. I asked about getting a 3.73, but he said I wouldn't need it based on wanting to put on 33's. Now after reading several posts I'm kicking myself and second guessing my plans.
Anyways I already ordered duratrac 285/75/16 on fuel 16x8 wheels with 4.5 backspace. They haven't been installed yet, so I can cancel or change my order. Should I go with a smaller tire so the 3.21 gears work better? It looks like the tires weight 54 plus 28 for the wheels. Is this too heavy for a manual 3.21 2door?

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Old 09-06-2013, 03:45 AM   #2
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I have 2013 4dr with 33"...I also run manual transmission and 3:21 gears..it runs fine..the power the new motors are making helps with that issue..also AEV makes an item called procal for about $160 it plugs into ur obd port and you can correct the addition of bigger tire to make engine trans etc run more efficiently

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Old 09-06-2013, 04:05 AM   #3
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I run 285/75-16's on 16x8 with 4.5" backspacing with 3.21's on my 2013 jku and have no issues what so ever. I am running Toyo open country at2's and Raceline wheels so similar weight as yours.
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Old 09-06-2013, 10:50 PM   #4
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My order arrived today..but I can't get them installed till tomorrow...so thanks for the reassurance.
Another question..should I order aev procal or take it to the dealer to calibrate the new tires? Is it needed on a 6 speed? If so, does it need to be done sooner than later?
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Old 09-07-2013, 05:54 AM   #5
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You can try dealer but this module you can reuse if you go bigger /smaller in future.simple to use..it should be done soon to maximize benefits of computer working with your engine
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Old 09-07-2013, 12:33 PM   #6
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Some dealers will tell you they can't/won't recalibrate the speedo for larger tires. If it does not bug you to have a speedo/odometer that is off then with the manual tranny it will be no big deal. With an auto it is because the shift points get out of wack. I can tell you that your speedo will be off by a far amount going from stock steelies and 225's to 285's. Mine was off 6 or 7 mph. I can not remember for sure but it was too much for me.
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Old 09-07-2013, 08:23 PM   #7
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Thanks! I'll look into buying a Procal. It seems like its idleing higher with the new tires. Is that normal or would the procal help with that too? I love the way it turned out.
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Old 09-07-2013, 09:39 PM   #8
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Quote:
Originally Posted by azsun3 View Post
Thanks! I'll look into buying a Procal. It seems like its idleing higher with the new tires. Is that normal or would the procal help with that too? I love the way it turned out.
tires size won't effect idle.

looks good tho. White with black just looks good.
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Old 09-08-2013, 12:09 AM   #9
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Won't help like last post tires won't effect idle

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