4.56 vs 4.88 in 2dr 6 speed JK - Page 2 - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Wrangler Forums > JK Wrangler Technical Forum > 4.56 vs 4.88 in 2dr 6 speed JK

Rough Country Lift Kits and Parts!1999-2004 Jeep Grand Cherokee Limited Headlight Pair1997 - 2001 Jeep Cherokee Header Panel

Reply
Unread 05-16-2011, 12:50 AM   #16
burr_83
Registered User
2010 JK Wrangler 
 
Join Date: Nov 2010
Location: Chinle, AZ
Posts: 49
Quote:
Originally Posted by river2c View Post
Definitely go with the 4.88s. I have a 6 speed manual and it's the perfect ratio for 35s. For highway driving, you are in overdrive so the RPMs are fine. An AEV Procal will adjust your speedometer.
ok cool thanks for the tip!

burr_83 is offline   Reply With Quote
Unread 05-16-2011, 02:42 AM   #17
jeeperjk
Web Wheeler
2009 JK Wrangler 
 
Join Date: May 2008
Location: Browns Mills, New Jersey
Posts: 1,494
Quote:
Originally Posted by PanthersFan View Post
You have a manual transmission, so you can test that. Just stay in 5th gear for a while on the interstate and see if the higher RPMs bother you.

Sent from my iPhone using JeepForum
His 5th gear would be closer to the rpms in 6th with 4.56's if he's on 225/75-16's and 3.21's.

4th gear with 225 tires would give you a good idea of what 5.13's would feel like.

OP, what tires are you runnin'?
jeeperjk is offline   Reply With Quote
Unread 03-22-2013, 03:38 PM   #18
burr_83
Registered User
2010 JK Wrangler 
 
Join Date: Nov 2010
Location: Chinle, AZ
Posts: 49
Quote:
Originally Posted by jeeperjk View Post
His 5th gear would be closer to the rpms in 6th with 4.56's if he's on 225/75-16's and 3.21's.

4th gear with 225 tires would give you a good idea of what 5.13's would feel like.

OP, what tires are you runnin'?
Holy Crap it's been a long time ya'll! Almost two years. It's just the inherent nature of forums... posts are pulled from the dust after years of neglect!

Ok, update. I have 3.5" rock krawler mid arm kit gonna put on soon. I have decided to go with 4.88's after viewing the posts in this thread. By the way anyone have a particular brand in mind for gears? Does it matter much? yukon, spice, etc?

Next thing is wheels and tires. I'm going with 35's. Not sure which brands/styles yet I'm searching for that as we speak. I do know they want me to get 4.5 inch backspacing so that's what i'm looking for. After i get the tires/wheels thrown on I may look at getting select lockers put in like ARB air lockers.

Now I have another question will 3.5 inch lift and 35 inch tires change the yoke/drive shaft angles... will i need to get a reangle on these drive line components at all?

Thanks for any advice! Good to see you all again too haha
__________________
I shop:

www.northridge4x4.com
www.KrawlOff-Road.com
burr_83 is offline   Reply With Quote
Unread 03-22-2013, 06:12 PM   #19
Blake2986
Registered User
2003 WJ 
 
Join Date: Jun 2012
Location: Vancouver, British Columbia
Posts: 62
What do a set of 4.88 gears usually run you? I am looking at purchasing a 2010 JK, 2dr 6 spd sport. Lift and at least 35's for the future. Sorry not trying to hijack the post.

It also currently has the 3.21 axle ratio...
__________________
~VanCityCrawler~

"pain is temporary, results are forever"
Blake2986 is offline   Reply With Quote
Unread 03-22-2013, 11:39 PM   #20
Filthy-Beast
Web Wheeler
 
Filthy-Beast's Avatar
2006 LJ Wrangler 
 
Join Date: Aug 2009
Location: Palatine, IL
Posts: 2,334
around Chicago labor is 2/3 of the total cost of getting gears done. You can pick up a good set gears with rebuild kits for around 600 US. If you're thinking about lockers do them at the same time so you don't double pay labor.
__________________
13 JKUR Build thread

For Sale: 2013 4dr JK Painted black Hard Top JKUR 18/59 springs and shocks

97 TJ: daughter 1 - 2.5L, Auto, 2" BB, 31" GY Duratrac
98 TJ: Daugher 2 - 4.0L, 5spd, D44 rear
06 LJ Rubicon: mine - Rokmen full up-armor, 8 adjustable CAs, front bumper, sliders, corners, Shrockworks rear bumper, 3" AEV/BDS lift, Currie HD stearing and Antirock, MT/r - k 35x12.5, SuperWinch, MC Overlines, York OBA
13 JKU Rubicon: Wife's for now, Ace Rock rails & rear bumper tire carrier, Truck Lites, MC Game changer 3.5 lift, RR skids, PSC Brawler front bumper, Warn 9.5cti-s, 35" GY MTRs
Filthy-Beast is offline   Reply With Quote
Unread 03-25-2013, 10:33 PM   #21
J33PNSL33P
Registered User
2007 JK Wrangler 
 
Join Date: Jan 2012
Location: Red Deer, Alberta
Posts: 181
I am looking at getting my jeep re-geared at a local shop. I told hem I was thinking 4.88 (2007 6 spd manual sport on 35's) but they are pushing 4.56 as it is mostly daily driver use. I am out close to the mountains and am constantly down shifting from 5th( no use of 6th) up hills and while trying to pass. Should I stick with my original choice of 4.88?
J33PNSL33P is offline   Reply With Quote
Unread 03-25-2013, 10:41 PM   #22
Filthy-Beast
Web Wheeler
 
Filthy-Beast's Avatar
2006 LJ Wrangler 
 
Join Date: Aug 2009
Location: Palatine, IL
Posts: 2,334
Quote:
Originally Posted by J33PNSL33P View Post
I am looking at getting my jeep re-geared at a local shop. I told hem I was thinking 4.88 (2007 6 spd manual sport on 35's) but they are pushing 4.56 as it is mostly daily driver use. I am out close to the mountains and am constantly down shifting from 5th( no use of 6th) up hills and while trying to pass. Should I stick with my original choice of 4.88?
your call, the rpm chart might help you decide, I think 4.56 gears cost a little more. If you've currently got 3.21 gears them your at 1800 RPM going 70 and 4.88 would almost be 2800 RPM at 70.
jk_ratio-chart.jpg  
__________________
13 JKUR Build thread

For Sale: 2013 4dr JK Painted black Hard Top JKUR 18/59 springs and shocks

97 TJ: daughter 1 - 2.5L, Auto, 2" BB, 31" GY Duratrac
98 TJ: Daugher 2 - 4.0L, 5spd, D44 rear
06 LJ Rubicon: mine - Rokmen full up-armor, 8 adjustable CAs, front bumper, sliders, corners, Shrockworks rear bumper, 3" AEV/BDS lift, Currie HD stearing and Antirock, MT/r - k 35x12.5, SuperWinch, MC Overlines, York OBA
13 JKU Rubicon: Wife's for now, Ace Rock rails & rear bumper tire carrier, Truck Lites, MC Game changer 3.5 lift, RR skids, PSC Brawler front bumper, Warn 9.5cti-s, 35" GY MTRs
Filthy-Beast is offline   Reply With Quote
Unread 03-25-2013, 10:59 PM   #23
J33PNSL33P
Registered User
2007 JK Wrangler 
 
Join Date: Jan 2012
Location: Red Deer, Alberta
Posts: 181
Quote:
Originally Posted by Filthy-Beast

your call, the rpm chart might help you decide, I think 4.56 gears cost a little more. If you've currently got 3.21 gears them your at 1800 RPM going 70 and 4.88 would almost be 2800 RPM at 70.
Correct I am just under 2000 rpm at 70mph, very sluggish. I just want to get it right the first time. I don't see a big enough difference between the two to warrant paying more for the 4.56.
J33PNSL33P is offline   Reply With Quote
Unread 03-25-2013, 11:16 PM   #24
Filthy-Beast
Web Wheeler
 
Filthy-Beast's Avatar
2006 LJ Wrangler 
 
Join Date: Aug 2009
Location: Palatine, IL
Posts: 2,334
I don't have a 3.8l, I've got 2.5l, 4.0l and 3.6l based jeeps, so I don't have personal experience with that engine. The 4.88 will give you more power and be quicker, you'll like it better if you rock crawl, you'll need them if you go to 37" tires. they will get worse gas mileage.

To me just as important is shift points, I spend a lot of time driving at speeds between 35 and 40 before I re-geared, my LJ it hated it, I was either running at high RPM or lugging. I was able to find a gear calculator that showed rpm for different speeds and gears for my motor and trans. Then based on my motor's power band and the RPM it liked to shift at I picked a gear that worked for both shift points and highway speed. For my LJ that was 4.88.
__________________
13 JKUR Build thread

For Sale: 2013 4dr JK Painted black Hard Top JKUR 18/59 springs and shocks

97 TJ: daughter 1 - 2.5L, Auto, 2" BB, 31" GY Duratrac
98 TJ: Daugher 2 - 4.0L, 5spd, D44 rear
06 LJ Rubicon: mine - Rokmen full up-armor, 8 adjustable CAs, front bumper, sliders, corners, Shrockworks rear bumper, 3" AEV/BDS lift, Currie HD stearing and Antirock, MT/r - k 35x12.5, SuperWinch, MC Overlines, York OBA
13 JKU Rubicon: Wife's for now, Ace Rock rails & rear bumper tire carrier, Truck Lites, MC Game changer 3.5 lift, RR skids, PSC Brawler front bumper, Warn 9.5cti-s, 35" GY MTRs
Filthy-Beast is offline   Reply With Quote
Unread 03-27-2013, 11:33 AM   #25
burr_83
Registered User
2010 JK Wrangler 
 
Join Date: Nov 2010
Location: Chinle, AZ
Posts: 49
Yeah... man this is so hard! My mind keeps jumping from 4.56 to 4.88... one minute i will be convinced 4.88 is ok... then i will see others say 4.56 for daily drivers... i just don't know anymore!

So please hopefully someone with JK experience chime in on this one... it's sort of apples and oranges when someone chimes in without any knowledge or experience with JK's.... my jk is 2-door sport currently rolling 32 inch tires with 3.21 gears BUT let me please tell you that in May I am really really thinking about getting the 2013 model Jk 2-door sport... please let me know what you think of this as well as the gear issue as from what I have heard the 2010 or the 2013 doesn't matter because drivetrains are all the same, but what do you all think about the new engines in the '13??? I hear it's very awesome!!!

So....
I have heard some say it does start to wind up quite a bit with 4.88's going 70 mph. I think 4.56 would be best but I am just so unsure... I haven't found a good consensus among those who are daily drivers and also want to use it for an offroad beast to have fun in, all in one vehicle. I need to go probably 70 sometimes 75 without over stressing the engine and drivetrain. I think the problem lies in the fact that many people have different understandings of "rock crawling" or "off roading". So many that chime in on the boards are avid extreme offroad people and have a very biased idea of what fun and rock crawling is. So I am not talking about this definition of adventure, I am referring to pushing it hard but not like crazy... not trying to conquer every rock i see... just moderate fun/off roading/some rocks/some rugged terrain/etc. Not to go to moab and come out saying I climbed a 60 degree angle faced rock. Just to have fun and definitely take this beast places others can't go! Then I need to be able to turn around and put this son of a goat on the highway and go 400 miles at 70 mph much of the way most likely. Which gears are good for that?

Currently I live at 5,500 ft elevation but I move around the country. Is 4.88 going to really bog this beast down with 35 inch tires and added weight of bumpers, winch, possibly rock armor for panels and such?? Shouldn't be too hard to answer this question on the average. Come on no bull****/trolling.... now If I could just find someone that had 4.88's in a jeep that's about my build! I would test drive it!

Please someone just shoot us straight here. Is 4.88 gonna piss me off to no end when I want to go 70mph? Or is it just going to be slightly high rpm's in 6th that i have to worry about? To me that is not a big deal in the later case. For the offroad enthusiast/fanatic the main factor for me is that my jeep gets me places without me wishing i had a 7th gear all the dang time!

Thank you for any further advice or input from you all!
__________________
I shop:

www.northridge4x4.com
www.KrawlOff-Road.com
burr_83 is offline   Reply With Quote
Unread 03-27-2013, 11:40 AM   #26
Filthy-Beast
Web Wheeler
 
Filthy-Beast's Avatar
2006 LJ Wrangler 
 
Join Date: Aug 2009
Location: Palatine, IL
Posts: 2,334
Go out and in 4th or 5th gear run at 2600 RPM for a while, that will be like 4.56 in 6th at 70. Then do the same at 2800 rpm to simulate 4.88 gears at 70. My 4.0 loves 2600 to 2800 rpm I don't shift until about 3200 hundred.
__________________
13 JKUR Build thread

For Sale: 2013 4dr JK Painted black Hard Top JKUR 18/59 springs and shocks

97 TJ: daughter 1 - 2.5L, Auto, 2" BB, 31" GY Duratrac
98 TJ: Daugher 2 - 4.0L, 5spd, D44 rear
06 LJ Rubicon: mine - Rokmen full up-armor, 8 adjustable CAs, front bumper, sliders, corners, Shrockworks rear bumper, 3" AEV/BDS lift, Currie HD stearing and Antirock, MT/r - k 35x12.5, SuperWinch, MC Overlines, York OBA
13 JKU Rubicon: Wife's for now, Ace Rock rails & rear bumper tire carrier, Truck Lites, MC Game changer 3.5 lift, RR skids, PSC Brawler front bumper, Warn 9.5cti-s, 35" GY MTRs
Filthy-Beast is offline   Reply With Quote
Unread 03-27-2013, 11:50 AM   #27
ncb
Registered User
 
Join Date: Mar 2009
Location: Your mom's house, Colorado
Posts: 4,313
I have 4.88 and 35s on my 2009 unlimited six speed. At 75 mph the RPMs are 3100. It sounds like a lot but it's perfect. 5.13 might have been better since I'm in Colorado and range from 6K-13K feet.
ncb is offline   Reply With Quote
Unread 07-08-2013, 06:52 AM   #28
softpickle
Registered User
2007 JK Wrangler 
 
Join Date: Mar 2012
Location: rural retreat, virginia
Posts: 3
Quote:
Originally Posted by burr_83 View Post

Holy Crap it's been a long time ya'll! Almost two years. It's just the inherent nature of forums... posts are pulled from the dust after years of neglect!

Ok, update. I have 3.5" rock krawler mid arm kit gonna put on soon. I have decided to go with 4.88's after viewing the posts in this thread. By the way anyone have a particular brand in mind for gears? Does it matter much? yukon, spice, etc?

Next thing is wheels and tires. I'm going with 35's. Not sure which brands/styles yet I'm searching for that as we speak. I do know they want me to get 4.5 inch backspacing so that's what i'm looking for. After i get the tires/wheels thrown on I may look at getting select lockers put in like ARB air lockers.
I am getting ready to re gear my 07 2 door as well. I already have the 35's with a 3.5in lift. Since it is a daily driver, I opted for the general general grabber at2. Does great on and off the road so far just sluggish with the 3.21.The cheapest I have found gears is at roughcountry.com. There you have your choice of 4.56, 4.88, or 5.13 for the same price complete with install kits. I am going 4.88 after seeing this thread.
The only problem I am having is deciding between Ox, yukon zip or arb locker. I don't do that much hardcore wheeling so this is where I am stuck at.
softpickle is offline   Reply With Quote
Unread 07-08-2013, 06:56 AM   #29
softpickle
Registered User
2007 JK Wrangler 
 
Join Date: Mar 2012
Location: rural retreat, virginia
Posts: 3
I would also recommend going ahead and putting axle sleeves and knuckle gussets in place if you are going 35 or bigger on stock axle housing.
softpickle is offline   Reply With Quote
Reply
Thread Tools


Suggested Threads





Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.