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-   -   4.56 gears (http://www.wranglerforum.com/f210/4-56-gears-176271.html)

KevinNJ 07-26-2012 07:16 AM

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.

TnDz TJ 07-26-2012 07:39 AM

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....

lindel 07-26-2012 08:48 AM

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.

530ktm 07-26-2012 10:01 AM

33 inch tires = 4.56 / 35 inch tires = 4.88

Jerry Bransford 07-26-2012 10:03 AM

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.

KevinNJ 07-26-2012 10:44 AM

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.

MrStuky 07-26-2012 10:46 AM

Quote:

Originally Posted by Jerry Bransford (Post 2623715)
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?

Jerry Bransford 07-26-2012 12:47 PM

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.

MrStuky 07-27-2012 01:40 AM

Quote:

Originally Posted by Jerry Bransford (Post 2624313)
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

Derp 07-27-2012 02:00 AM

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

Mattsn002 07-27-2012 10:31 AM

Quote:

Originally Posted by 530ktm (Post 2623705)
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.

Jerry Bransford 07-27-2012 12:50 PM

Quote:

Originally Posted by Mattsn002 (Post 2627633)
... 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. :)

Mattsn002 07-27-2012 01:21 PM

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.

Retltwrangler 07-27-2012 02:07 PM

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....

MrStuky 07-27-2012 02:19 PM

Quote:

Originally Posted by Derp (Post 2626779)
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

kshaws21 07-27-2012 02:34 PM

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.

Derp 07-27-2012 02:52 PM

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.

Jerry Bransford 07-27-2012 03:06 PM

Quote:

Originally Posted by Mattsn002 (Post 2628148)
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. :)

MrStuky 07-27-2012 03:24 PM

Quote:

Originally Posted by kshaws21 (Post 2628369)
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.

Jcole231 07-27-2012 03:43 PM

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

jeeptester 07-27-2012 05:08 PM

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?

freeskier 07-27-2012 06:24 PM

Quote:

Originally Posted by MrStuky (Post 2628508)
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?

IndyJeepMan 07-27-2012 06:30 PM

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.

MrStuky 07-30-2012 11:41 AM

Quote:

Originally Posted by freeskier (Post 2628958)
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.

http://img109.imageshack.us/img109/8...0713124745.jpg

Quote:

Originally Posted by IndyJeepMan (Post 2628981)
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!

Jerry Bransford 07-30-2012 12:10 PM

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.

kshaws21 07-30-2012 01:02 PM

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.

IndyJeepMan 07-30-2012 01:37 PM

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.

Rubicon1968 11-05-2012 07:28 PM

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..

freeskier 11-05-2012 11:10 PM

Quote:

Originally Posted by Rubicon1968 (Post 2963671)
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.

Rubicon1968 11-06-2012 11:48 AM

Quote:

Originally Posted by freeskier (Post 2964548)
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


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