Point taken! 488s will be installed Monday. Still gonna try to run 80 plus on my road trips!
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Regear to 5.13, RPMs at 80/85/90mph??
- Thread starter RUBEERCON
- Start date
A 35" tall tire with 5.13 final and a 1-1 transmission gear will be turning 4200rpm at 85mph
check it out your self on the Speed calculator http://www.public.asu.edu/~grover/willys/speed.html
You can input your own values in the column on the right which I did for your gear ratio as its not a listed choice.
check it out your self on the Speed calculator http://www.public.asu.edu/~grover/willys/speed.html
You can input your own values in the column on the right which I did for your gear ratio as its not a listed choice.
Sorry to bump the thread...
I was running 90 in the fast lane in my truck and a Sahara was staying out in front of me. Guess I'm not the only speed Jeeper. I'm sure he had the 321? Gear.
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I was running 90 in the fast lane in my truck and a Sahara was staying out in front of me. Guess I'm not the only speed Jeeper. I'm sure he had the 321? Gear.
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chuck79
New member
I have 5.38 and 35 km2. 75 at 2750. 80 2900. It's an 08 auto. I like how it drives.
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notnalc68
That dude from Mississippi
OP has a 2015, with automatic transmission. It's totally different. Optimum gears for his Jeep, are 4.88 for 35, and 5.13 for 37.
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TrainWreck618
Caught the Bug
tgoss
New member
Andy5160
Hooked
90mph is not fun at all i tried it one don't want to try again.
Thanks for the photos! Too late now they are installing the 488s as we speak but that's ok cause I'll be on 35's now and possibly forever.
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notnalc68
That dude from Mississippi
Your revs will mirror those, very closely, with 4.88 and 35's.
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I second this. I have a '15 auto 37's 5:13, perfect for road with hills and with load in it., I had 35's for a couple month's before the 37's and I felt it revved high on the highway if you want to travel between 70 and 80 mph. Never been offroading before so I can't comment there, but I have been told that the 5:13's with 35's would be a better choice.
BANSHEE13
New member
I am looking at changing gears on my JK and ran across this thread and your post got my attention. Do you have a manual? I am regearing to gain some power and MPG hopefully. My JK is looking at mostly road and trails on the weekends, maybe 2-3 times a month. Thoughts.
Bontemp
New member
I geared my 2014 JKUR with 5:13 and ran 35" KM2's for 3 years. It had lots of power but almost 3k at 70, just a little too low on the 35's. I just put 37's on and it is perfect, really made a difference.
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OverlanderJK
Resident Smartass
OverlanderJK
Resident Smartass
Last edited:
:cheesy: Just saw this and was thinking the same thing :crazyeyes:
JKbrick
Active Member
Maybe he meant his gears were too low not his rpm I would hope
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