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Anyone running bigger tires without the calibration done? Experience?

jfhull71

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Looking to go for bigger tires, probably going to recall, but want to know if it would run ok a week or two until I have time. I work a lot. Lol
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kevman65

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Short period, yes.

Your speedo will be off and the transmission shift points will be off.
You'll probably be very happy when you re-calibrate.
 

irishcoffee64

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Short period, yes.

Your speedo will be off and the transmission shift points will be off.
You'll probably be very happy when you re-calibrate.
I'm running Duratrac 35's on a stock Rubi.....is there enough of a difference that I'd need to recalibrate? I figured the 4:10 gears would make it irrelevant, but maybe the shift points would change....I'm on the fence....
 
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jfhull71

jfhull71

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Short period, yes.

Your speedo will be off and the transmission shift points will be off.
You'll probably be very happy when you re-calibrate.
Thanks, my trans seem to be dumb on stock tires, anything would be better, lol
 

kevman65

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I'm running Duratrac 35's on a stock Rubi.....is there enough of a difference that I'd need to recalibrate? I figured the 4:10 gears would make it irrelevant, but maybe the shift points would change....I'm on the fence....

My Toyo 35's measure 34.8" at inflation that I run, before I ran the Tazer I was about 7 MPH off and transmission shifts were all the over the place. Early, late, double shift a couple of times.
 

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jfhull71

jfhull71

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My Toyo 35's measure 34.8" at inflation that I run, before I ran the Tazer I was about 7 MPH off and transmission shifts were all the over the place. Early, late, double shift a couple of times.
Thanks, after is was good? Mine on stock tires seems to hold gears uphill, to were I have to lift slightly to get it to upshift.
 
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jfhull71

jfhull71

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If you're still low on miles, your JT is still "learning" your driving habits. The onboard "brainbox" is adaptable to a point.
3250 miles. Ten months old
 
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jfhull71

jfhull71

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Yeah sat
Your miles on the truck is the biggest thing
Sat In garage for four months, solving an 8 year old license issue, was a long four months.
 

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TrainMan

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It will be fine for a while. I ran over a month before recalibrating.
 

AmishMike

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Stock Rubicon 5,500 miles, 35's on since 3,000 miles, no calibration. No problems at all.
My math says yes Kevin is correct about 7 mph off at 65.
I have no intention of paying just to calibrate the tires.
 

MoparToYou

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I've been running mine with 37s and no recalibration since last August (8300 miles). According to my Lowrance GPS my speedometer is 11% off, so if I want to go the 80 mph speed limit on the interstate I set the cruise at 73. Shift points could be better. Shift points weren't great to begin with though
 
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jfhull71

jfhull71

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I've been running mine with 37s and no recalibration since last August (8300 miles). According to my Lowrance GPS my speedometer is 11% off, so if I want to go the 80 mph speed limit on the interstate I set the cruise at 73. Shift points could be better. Shift points weren't great to begin with though
IKR on stock tires my trans, I swear never shifts the same place twice on my way home from work
 

Kevin_D

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I have no intention of paying just to calibrate the tires.
Really?
Why not?
A JScan setup runs less than a set of TPMS sensors, and then your speedometer and AT (assuming AT) will be happier.

Kevin
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