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Old 02-12-2010, 08:36 PM   #1
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Question JK 09 Automatic Wrangler Gear Ratio Question

at what tire and wheel size do you need to adjust your gear ratio on an automatic,i switched from a 225/75r16 to a 305/60r18 and have noticed a significant rise in my rpms

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Old 02-13-2010, 03:16 AM   #2
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Are the 18's somehow shorter than the 16's? Don't know 60's!
If you went to a taller tire, your rpm's should decrease, along with your power, and your speedometer would be slower.

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Old 02-13-2010, 08:20 PM   #3
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Tire Conversion Chart

According to this you are running 36's. You definatly need to regear! Don't know what model you have but I'm running my factory 32's on 4.10's and I wouldn't want to go above 33's with my factory gears.
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Old 02-13-2010, 08:23 PM   #4
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Quote:
Originally Posted by GEM1N1 View Post
Tire Conversion Chart

According to this you are running 36's. You definatly need to regear! Don't know what model you have but I'm running my factory 32's on 4.10's and I wouldn't want to go above 33's with my factory gears.
Sorry. I plugged in 305/75/18. Your only running 32's. You should be fine since that is what JK's come with from the factory you just went with a wider tire. Most people don't regear until they go with 35" or bigger.
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Old 02-14-2010, 09:33 AM   #5
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lift kits&tire size

im switching from a 2 inch lift to a 4 inch i was worried that it would make my 32's on 18's look too small .it's hard to find a decent tire for that size wheel without blowing the bank or my transmission.should i go bigger with the tires or just break the bank and buy new wheels and tires and if thats the case how big can i go without damage to the trans or torque converter.(it's an automatic trans)
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