4.56 gears - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ Tech Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 07-26-2012, 07:16 AM   #1
Jeeper
 
KevinNJ's Avatar
 
Join Date: Jul 2012
Location: Morris County NJ
Posts: 318
4.56 gears

I've only had the jeep for a month, but why did I wait so long. Just picked it up last night after the regear and what a difference from 3.73 to 4.56, running 35 inch tires on a 5 speed manual. Never knew I had 5th gear. And no more downshifting! If anyone is on the fence it is worth the coin.

KevinNJ is offline   Quote Quick Reply
Old 07-26-2012, 07:39 AM   #2
Jeeper
 
TnDz TJ's Avatar
 
Join Date: Apr 2011
Location: Reno, NV
Posts: 2,925
Images: 220
It does make a world of difference... I have 4.56's with my 33's ( I had 3.07's ) and when the time comes for 35's I will be going to the recommended 4.88's for the 4.0 with a 5 speed.... but that is a little later down the road...

You would have been better off with the 4.88's... you would have notice even more....

__________________
~Todd~ 2004 X 4.0 5 speed---SOLD
4" Lift, 4.56's, 33" Duratracs on M/T Classics
RR SYE, Tatton CV, MML, BL, TT, Dynomax Exhaust
Hella Lighting: Driving, Fogs and H4 E-Codes
NOPE! ... and NEVER will be...
TnDz TJ is offline   Quote Quick Reply
Old 07-26-2012, 08:48 AM   #3
Full Size Jeep Dr.

WF Supporting Member
 
lindel's Avatar
 
Join Date: Nov 2011
Location: The land of Salted Iron
Posts: 2,024
I can tell you that 35s with 4.10s is not optimal. You'll still have downshift on a steep hill or with a stiff headwind. 33s with 4.10s is better, but I still need to downshift on steep hills or against a headwind, just not as quickly or as often.
__________________
His: 1999 Flame Red TJ, With a few mods...

Hers: 1987 Grand Wagoneer, stock w/Falken Wildpeak ATs
lindel is offline   Quote Quick Reply
Old 07-26-2012, 10:01 AM   #4
Jeeper
 
530ktm's Avatar
 
Join Date: May 2010
Location: Southern California
Posts: 3,733
Images: 3
33 inch tires = 4.56 / 35 inch tires = 4.88
530ktm is offline   Quote Quick Reply
Old 07-26-2012, 10:03 AM   #5
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 32,018
Images: 2
4.56 was an improvement but it's too bad you didn't ask for an opinion before you regeared, we would have done our best to talk you into 4.88 which is really the optimal ratio for 35" tires and the 5-speed. I ran that combo for years and it was sweet.
__________________
Remember that having a different opinion doesn't also require one to be a jerk when expressing it.

When you have a choice, buy American.

Jerry Bransford is offline   Quote Quick Reply
Old 07-26-2012, 10:44 AM   #6
Jeeper
 
KevinNJ's Avatar
 
Join Date: Jul 2012
Location: Morris County NJ
Posts: 318
Thanks for the buzzkill...
I looked through all old threads on here, tire size/gear ratio charts out there and discussed with the good folks who were doing my regear my jeep use. 4.56 is the perfect all around gear for what I use it for.
KevinNJ is offline   Quote Quick Reply
Old 07-26-2012, 10:46 AM   #7
Jeeper
 
MrStuky's Avatar
 
Join Date: Jul 2012
Location: Lynwood, CA
Posts: 170
Quote:
Originally Posted by Jerry Bransford View Post
4.56 was an improvement but it's too bad you didn't ask for an opinion before you regeared, we would have done our best to talk you into 4.88 which is really the optimal ratio for 35" tires and the 5-speed. I ran that combo for years and it was sweet.
4.88 Setup/35" Tires would go the same for a 4 Cyl, 6-speed correct? Think the jeep would have any issues running this as it's a 4 Cyl?
MrStuky is offline   Quote Quick Reply
Old 07-26-2012, 12:47 PM   #8
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 32,018
Images: 2
Unless you have upgraded the factory rear Dana 35 axle that comes with the 2.4 and 2.5 engines, it's not a good idea to run 35" tires. The axle shafts in a Dana 35 just aren't strong enough for that big of a tire and will eventually snap when you're off road.
__________________
Remember that having a different opinion doesn't also require one to be a jerk when expressing it.

When you have a choice, buy American.

Jerry Bransford is offline   Quote Quick Reply
Old 07-27-2012, 01:40 AM   #9
Jeeper
 
MrStuky's Avatar
 
Join Date: Jul 2012
Location: Lynwood, CA
Posts: 170
Quote:
Originally Posted by Jerry Bransford View Post
Unless you have upgraded the factory rear Dana 35 axle that comes with the 2.4 and 2.5 engines, it's not a good idea to run 35" tires. The axle shafts in a Dana 35 just aren't strong enough for that big of a tire and will eventually snap when you're off road.
From the looks of it, I have a ford 8.8 so I'm capable of running the gears. Where would you recommend me getting them? I see them at 250$ to 650$ not sure which to get. Also, for the front? Do I need to regear aswell? Does this mean I have to get a better axle for the front?

Thanks
MrStuky is offline   Quote Quick Reply
Old 07-27-2012, 02:00 AM   #10
Jeeper
 
Derp's Avatar
 
Join Date: Jul 2012
Location: Huntington Beach CA
Posts: 583
Quote:
Originally Posted by MrStuky

From the looks of it, I have a ford 8.8 so I'm capable of running the gears. Where would you recommend me getting them? I see them at 250$ to 650$ not sure which to get. Also, for the front? Do I need to regear aswell? Does this mean I have to get a better axle for the front?

Thanks
D30 would suffice. I'd go HP30

For gears ECGS
Derp is offline   Quote Quick Reply
Old 07-27-2012, 10:31 AM   #11
Jeeper
 
Mattsn002's Avatar
 
Join Date: Jul 2012
Location: Oakland County
Posts: 18
Quote:
Originally Posted by 530ktm View Post
33 inch tires = 4.56 / 35 inch tires = 4.88
Thanks for this thread I was just thinking about this. I have a 97 tj 4.0l 5 speed by the spec chart I keep finding on Google It looks like I have 3.07's

1997-2007 Jeep Wrangler specifications

So what If I went 4.88's on 33's would I be even better off ? I don't have much experience wheeling with a manual transmission. And dealing with gear ratio's even as a light duty mechanic for 5 years I never had to do this. Originally my plan for next spring called for a thorough 4" lift, 33's, and 4.56's so If I over geared would I get more performance?

Also contemplating the much debated Cold air, Cat Back exhaust and 62mm intake for a lil more horsepower when winding out the gears.
__________________
Life Priorities :
Jeep
Garage w/ House
Harley Davidson
Cant decide on wife or more toys next..
Mattsn002 is offline   Quote Quick Reply
Old 07-27-2012, 12:50 PM   #12
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 32,018
Images: 2
Quote:
Originally Posted by Mattsn002 View Post
... So what If I went 4.88's on 33's would I be even better off ?
No not at all, your highway rpms would be excessive with that combination. 4.56 is really the optimal all-around street/trail ratio for 33" tires. Only go with 4.88 if you know 35" tires are in your near term future.
__________________
Remember that having a different opinion doesn't also require one to be a jerk when expressing it.

When you have a choice, buy American.

Jerry Bransford is offline   Quote Quick Reply
Old 07-27-2012, 01:21 PM   #13
Jeeper
 
Mattsn002's Avatar
 
Join Date: Jul 2012
Location: Oakland County
Posts: 18
Thanks Jerry I am trying to make this make sense. My old man first exposed me to wheeling with an 81 Cj-7 with a 350 and he swears I should consider 4:10 or 3:73's at most.
__________________
Life Priorities :
Jeep
Garage w/ House
Harley Davidson
Cant decide on wife or more toys next..
Mattsn002 is offline   Quote Quick Reply
Old 07-27-2012, 02:07 PM   #14
Newb
 
Retltwrangler's Avatar
 
Join Date: Jul 2012
Location: New Smyrna Beach FL
Posts: 1
Hi: Just purchased a 2001 Wrangler Sport w/ 4 in lift, 33 tires and a 5 sp manual trans , I have no 5th gear to speak of, what gears are in this Wrangler now and what should I be running with this set up. Also, what is the cost of regearing if I do go that direction? Is this something I can do my self? And, what is the main advantage to regearing?

Thanks in advance....
Retltwrangler is offline   Quote Quick Reply
Old 07-27-2012, 02:19 PM   #15
Jeeper
 
MrStuky's Avatar
 
Join Date: Jul 2012
Location: Lynwood, CA
Posts: 170
Quote:
Originally Posted by Derp View Post
D30 would suffice. I'd go HP30

For gears ECGS
Do I need to regear the front axle too? If so Wouldn't I need a different case to fit the 4.88? Or is the front/back different gears?

Thanks
MrStuky is offline   Quote Quick Reply
Old 07-27-2012, 02:34 PM   #16
Jeeper
 
kshaws21's Avatar
 
Join Date: Jun 2011
Location: Northeast Ga. Mountains
Posts: 1,100
Quote:
Originally Posted by MrStuky

Do I need to regear the front axle too? If so Wouldn't I need a different case to fit the 4.88? Or is the front/back different gears?

Thanks
Yes you have to regear the front as well. You can get by without it as long as you never engage 4wd. 4.88 will fit in the stock carrier, that's what I have.
kshaws21 is offline   Quote Quick Reply
Old 07-27-2012, 02:52 PM   #17
Jeeper
 
Derp's Avatar
 
Join Date: Jul 2012
Location: Huntington Beach CA
Posts: 583
Quote:
Originally Posted by Retltwrangler
Hi: Just purchased a 2001 Wrangler Sport w/ 4 in lift, 33 tires and a 5 sp manual trans , I have no 5th gear to speak of, what gears are in this Wrangler now and what should I be running with this set up. Also, what is the cost of regearing if I do go that direction? Is this something I can do my self? And, what is the main advantage to regearing?

Thanks in advance....
It's not cheap. If you have a shop do it maybe a little more than 1k.

Advantages are mileage increase and more power.
Derp is offline   Quote Quick Reply
Old 07-27-2012, 03:06 PM   #18
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 32,018
Images: 2
Quote:
Originally Posted by Mattsn002 View Post
Thanks Jerry I am trying to make this make sense. My old man first exposed me to wheeling with an 81 Cj-7 with a 350 and he swears I should consider 4:10 or 3:73's at most.
The gearing needs of a 350 V8 equipped CJ with who knows what transmission are not the same as your TJ. His torquey V8 didn't need the same rpms your I6 does to work well. Various engine and transmission combinations will change the ratio recommendation for any given tire size. As well intentioned as your dad is, he's not basing his recommendation on what you have, only what he had.
__________________
Remember that having a different opinion doesn't also require one to be a jerk when expressing it.

When you have a choice, buy American.

Jerry Bransford is offline   Quote Quick Reply
Old 07-27-2012, 03:24 PM   #19
Jeeper
 
MrStuky's Avatar
 
Join Date: Jul 2012
Location: Lynwood, CA
Posts: 170
Quote:
Originally Posted by kshaws21 View Post
Yes you have to regear the front as well. You can get by without it as long as you never engage 4wd. 4.88 will fit in the stock carrier, that's what I have.
Since I have a Ford 8.8, I have to look in that section correct? And what brand would you guys recommend Nitro, Precision, Yukon? Would I need to modify anything to get the 4.88 into the rear axle? And whats the difference between the ford 8.8 and ford 8.8 reverse?

Sorry for all the questions!

Thanks.
MrStuky is offline   Quote Quick Reply
Old 07-27-2012, 03:43 PM   #20
Jeeper
 
Jcole231's Avatar
 
Join Date: Jul 2011
Location: Slidell
Posts: 273
I just bought a front and back gears from summit racing for my 8.8 and Dana 30. Search by axle model. I ended up going with motive gear. If u think ur gonna get a locker anytime soon I would wait and do them together
Jcole231 is offline   Quote Quick Reply
Old 07-27-2012, 05:08 PM   #21
Jeeper
 
jeeptester's Avatar
 
Join Date: Aug 2010
Location: Nankipoo, Tn
Posts: 332
I have a 4.8 vortec with overdrive trans.
Im building a 8.8 axle now and it has 4.10 that match my front now, so Im inclined to go with the 4.10. I recently changed from 31" tires to 35" I like the way it ran with the 31". Looking at the gear table it looks like 31" with 4.10 will run almost the same as 35" with 4.56. Its running 1700 rpm at 78 mph with the 35" 4.10

So its getting 16 mpg right now (if I keep foot out of it) but I liked the way the power was with the 31" but I guessing the mpg will go down if I change to 4.56 and worse for the 4.88

Agree?
__________________
My V8 Build page
http://www.wranglerforum.com/f5/2-5-...wap-91628.html
jeeptester is offline   Quote Quick Reply
Old 07-27-2012, 06:24 PM   #22
Jeeper
 
freeskier's Avatar
 
Join Date: Mar 2011
Location: Longmont, CO
Posts: 2,542
Quote:
Originally Posted by MrStuky View Post
Since I have a Ford 8.8, I have to look in that section correct? And what brand would you guys recommend Nitro, Precision, Yukon? Would I need to modify anything to get the 4.88 into the rear axle? And whats the difference between the ford 8.8 and ford 8.8 reverse?

Sorry for all the questions!

Thanks.
It's obvious you do not have the adequate knowledge to install your own gears. Take it to a professional. Also are you absolutely positive you have an 8.8? Are you a second owner? Did you swap it in?
freeskier is offline   Quote Quick Reply
Old 07-27-2012, 06:30 PM   #23
Jeeper
 
IndyJeepMan's Avatar
 
Join Date: Dec 2009
Location: Indianapolis
Posts: 3,387
The reverse 8.8 I believe is the IFS version of the 8.8, you will have the standard 8.8.

I have a set of superior 4.88's with the master install kit, id might be interested in selling. Never ran, just set up and taken back out.
__________________
1980 CJ7
3.9L Cummins POWER!
Follow my build, its cool and stuff: http://www.wranglerforum.com/f118/project-shake-n-bake-a-cummins-cj-188515.html]
IndyJeepMan is offline   Quote Quick Reply
Old 07-30-2012, 11:41 AM   #24
Jeeper
 
MrStuky's Avatar
 
Join Date: Jul 2012
Location: Lynwood, CA
Posts: 170
Quote:
Originally Posted by freeskier View Post
It's obvious you do not have the adequate knowledge to install your own gears. Take it to a professional. Also are you absolutely positive you have an 8.8? Are you a second owner? Did you swap it in?
One of my relatives is a mechanic, so we will be doing the regearing. And yes, it is a Ford 8.8 we already verified.



Quote:
Originally Posted by IndyJeepMan View Post
The reverse 8.8 I believe is the IFS version of the 8.8, you will have the standard 8.8.

I have a set of superior 4.88's with the master install kit, id might be interested in selling. Never ran, just set up and taken back out.
Send me a PM with the price mate.

Thanks!
MrStuky is offline   Quote Quick Reply
Old 07-30-2012, 12:10 PM   #25
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 32,018
Images: 2
Caution that not many mechanics, even experienced mechanics, are competent with r&p installations. My two local 4x4 shops only have 1-2 mechanics each out of 8-10 total they let do r&p installations.
__________________
Remember that having a different opinion doesn't also require one to be a jerk when expressing it.

When you have a choice, buy American.

Jerry Bransford is offline   Quote Quick Reply
Old 07-30-2012, 01:02 PM   #26
Jeeper
 
kshaws21's Avatar
 
Join Date: Jun 2011
Location: Northeast Ga. Mountains
Posts: 1,100
Quote:
Originally Posted by Jerry Bransford
Caution that not many mechanics, even experienced mechanics, are competent with r&p installations. My two local 4x4 shops only have 1-2 mechanics each out of 8-10 total they let do r&p installations.
Yep. I went to one of our counties most popular and respected shops about doing mine and the guy that owns it said no way. He said they are just too finicky and not enough people want it done around here for the mechanics to gain enough experience on them for him to feel comfortable letting them do it.
kshaws21 is offline   Quote Quick Reply
Old 07-30-2012, 01:37 PM   #27
Jeeper
 
IndyJeepMan's Avatar
 
Join Date: Dec 2009
Location: Indianapolis
Posts: 3,387
I did it with the guidance of a master tech. Its not hard as long as you cross your t's and dot your I's and use the proper tools and work smart not hard, using manuals guides and common sense. It all works out, just do your studying and check, check and check again.
__________________
1980 CJ7
3.9L Cummins POWER!
Follow my build, its cool and stuff: http://www.wranglerforum.com/f118/project-shake-n-bake-a-cummins-cj-188515.html]
IndyJeepMan is offline   Quote Quick Reply
Old 11-05-2012, 07:28 PM   #28
Jeeper
 
Rubicon1968's Avatar
 
Join Date: Oct 2012
Posts: 70
My understanding was 488 gear in a d30 is to small and creates a weaker axle on 35" tires after u joints. the R&P seems to become the weak link after you upgrade everything else IE:like adding chromo shafts with CTM u-joints, with a case locker.

I have been wrong many times though..
__________________
Donate to Wounded warrior Project if you can spare the money-Please pass this message on..
Rubicon1968 is offline   Quote Quick Reply
Old 11-05-2012, 11:10 PM   #29
Jeeper
 
freeskier's Avatar
 
Join Date: Mar 2011
Location: Longmont, CO
Posts: 2,542
Quote:
Originally Posted by Rubicon1968 View Post
My understanding was 488 gear in a d30 is to small and creates a weaker axle on 35" tires after u joints. the R&P seems to become the weak link after you upgrade everything else IE:like adding chromo shafts with CTM u-joints, with a case locker.

I have been wrong many times though..
It's debatable with a low pinion 30, but with a high pinion 30 I wouldn't worry about it at all.

Most likely though, even with a LP30, the shaft ears will give. Even with chromo shafts, the ears are not always treated (depends on the method of heat treating).

The 4.0L just doesn't put out a lot of torque to be shearing gear teeth. Not saying it's impossible, just not very likely. In the years I've been on these forums I've seen sheared D30 gears maybe once.
__________________
CU Boulder Aerospace Engineering
freeskier is offline   Quote Quick Reply
Old 11-06-2012, 11:48 AM   #30
Jeeper
 
Rubicon1968's Avatar
 
Join Date: Oct 2012
Posts: 70
Quote:
Originally Posted by freeskier View Post
It's debatable with a low pinion 30, but with a high pinion 30 I wouldn't worry about it at all.

Most likely though, even with a LP30, the shaft ears will give. Even with chromo shafts, the ears are not always treated (depends on the method of heat treating).

The 4.0L just doesn't put out a lot of torque to be shearing gear teeth. Not saying it's impossible, just not very likely. In the years I've been on these forums I've seen sheared D30 gears maybe once.
Thats good to hear thanks for your experience. What do you think about changing the pumpkin oil again after (like 500 miles) a gear change? Is it worth it?

Thanks I get my jeep back today 456 gears rear locker D44, front LSD D30 35" MTZ tires six speed

__________________
Donate to Wounded warrior Project if you can spare the money-Please pass this message on..
Rubicon1968 is offline   Quote Quick Reply
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Jeep Wrangler Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off




» Featured Product

All times are GMT -5. The time now is 11:08 AM.



Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC