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Post by jchappy on May 14, 2015 10:00:59 GMT -8
Charts for Gear Ratio  
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Post by SidiousJK on May 14, 2015 17:39:36 GMT -8
FYI, I used this chart and went 4.88s with my 37s on the 3.6 auto, which is the first blue. Now, I kind of wish I would have went with 5.13s, as I still struggle on the freeway with steep inclines. On long inclines, the transmission needs to downshift to 4th to maintain 70. On long and pretty steep inclines, like on I-8 going to Corral Canyon, it needs to go to 3rd. This puts the RPM near redline for too long.
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Post by Bling65 on May 14, 2015 19:11:21 GMT -8
im running 4.88s with 35s and the drivability is perfect. hill climbs even pulling a double jet ski trailer are no issue. i also upgraded my thermostat to the ripp 185 as i did not like how hot it was running pulling the trailer
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redjeeplando
SDJC New Forum Member
Posts: 4 
My Jeep:: 2012 JK Sport - lots of upgrades
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Post by redjeeplando on May 14, 2015 20:59:30 GMT -8
I'm running 4.88s with my 315's, Pentastar, manual transmission. At 65mph the RPMs are closer to 3k than I would like so I keep it around 60 most of time. Does really well on hills and off road though.
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Post by jchappy on May 15, 2015 5:59:54 GMT -8
I have 4.88's with my 3.8L and 315's it runs really well down the freeway and off road. I would say its a hair better than stock was with stock tires. Sometimes I wish I went 5.13's but I don't know if the extra few hundred RPM's is worth it to me since it is my DD. Right now on the freeway I get 16-17mpg, my average is 15mpg.
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RockTrooper
Mall Crawler
Always in motion is the future....
Posts: 76
My Jeep:: 2012 Wrangler Sport Unlimited
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Post by RockTrooper on May 15, 2015 18:54:59 GMT -8
I was debating back and fourth with my gearing before I decided on the 5.13 sitting on 37s. Glad I did! I average about 17.5mpg on the highway.
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Post by arctrooper on Mar 9, 2017 8:17:50 GMT -8
Great chart thanks guys I'm going to get the 4.88s My noob question is will my jeep be ok running on my 3.73's for a month or two with 35"s I know I'll loose some top end power till I regear running on the next gen Dana 44's 2016 Rubicon want to make sure in not going to kill my jeep
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Post by jchappy on Mar 9, 2017 8:48:37 GMT -8
you will be okay, if anything you can turn off OD if you have an auto
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Post by arctrooper on Mar 9, 2017 9:28:04 GMT -8
Yeah it's an auto and thanks
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