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Topic Review (Newest First)
11-12-2012 06:26 PM
Rubicon1968 I have a 6 speed LJ---I just regeared to 456 and can walk like a zombie faster than my jeep moves in 4l & 1st gear with 35" tires. 488 or 513 is probably better in 4 high or 2wd but I can't imagine my I6 needing a better gear ratio in low range which is where my 4x4 with 35" tires gets a workout and I don't want an easy break with 488 or 513 especially after I replaced the U's, and shafts already....
11-06-2012 08:23 PM
DevilDogDoc If you have a rubicon then you can go deeper than 4.88, I think you can go to 5.13 if you want to run 35's....
11-06-2012 08:21 PM
Jerry Bransford
Quote:
Originally Posted by Jacqui View Post
If we would need to regear anyway, we might as well make it capable of handling a set of 33"s...
Then regear to 4.88, 4.56 would not be enough gear for 33" tires with the 42RLE automatic transmission.
11-06-2012 08:14 PM
Jacqui Thank you. Looks like we should plan on regearing before we get new tires then. We have 4.10 stock Rubi gears. If we opt for 32" tires with the 42RLE, would we need to regear to 4.59? If we would need to regear anyway, we might as well make it capable of handling a set of 33"s...
11-06-2012 07:58 PM
Jerry Bransford
Quote:
Originally Posted by Jacqui View Post
I have a few questions here. Still have tons to learn about our LJ. Are recommended gears different between manual and auto? Would 4.10 gears be great when paired with 32" tires? Is there a major difference between running 4.10 with 33"s vs 4.56 with 33"s? How much of a difference in mileage?

Thanks.
Yes, there are major differences in what gear ratios are the best choices between transmissions... ESPECIALLY when the transmission in question is the 42RLE 4-speed automatic that is on 2003 and newer Wranglers and Unlimiteds. If that's the transmission you have, you absolutely need 4.88 gearing to make it work properly/well with 33" tires. Yes I know 4.88 sounds awfully deep for 33" tires, it would be for other transmissions, but the 42RLE automatic has a .69 Overdrive gear ratio which drops the RPMs too much for a normal gear ratio like 4.10 or 4.56. You need 4.88 gearing to get the RPMs up enough so the engine isn't lugging with 33" tires. With the 42RLE and 33" tires, you'd get better mpg with 4.88 than you woud with 4.10 or 4.56 that would make the engine lug.
11-06-2012 07:19 PM
DevilDogDoc There are lots of differences between auto and manual, for yours you want as low a set of gears as you can get, the OD on the late model jeeps suck. 4.88 is what you want and even that is lacking. Mileage wise, it's a brick with a tent strapped to its ass, if I get 15 mpg I feel good!!
11-06-2012 05:52 PM
Jacqui I have a few questions here. Still have tons to learn about our LJ. Are recommended gears different between manual and auto? Would 4.10 gears be great when paired with 32" tires? Is there a major difference between running 4.10 with 33"s vs 4.56 with 33"s? How much of a difference in mileage?

Thanks.
11-06-2012 05:33 PM
freeskier
Quote:
Originally Posted by DevilDogDoc View Post
I got mine geared and locked at the same time and I think the gearing has made a bigger impact on my wheeling than the lockers do, I flip the rear locker on and off all the time as I figure if I don't need it why keep it on right? The crawl in 4lo, 1st gear is amazing I can go down the steepest loose rock hills at just idle and in perfect control compared to before sliding down because I had to keep on the brakes....now on the street well I am driving like an ass again with my newfound power!!
I haven't tried it, but according to my dad who drove the jeep a couple times to work while I'm at school, he was able to do a pretty decent burnout in the parking lot at his office.
11-06-2012 03:09 PM
Rubicon1968 Just got my jeep back and holy crap gears are worth the cash and sixth gear isn't a Myth.. lol..

I'll change the Oil and maybe do new covers in 500 miles if I have the cash.. Thanks Freeskier and everyone else
11-06-2012 02:20 PM
Derp
Quote:
Originally Posted by DevilDogDoc
It'll be fine, I rolled for 2 years on 33's and 3.07, no fifth and passing sucked but I could go 80 in fourth just fine, so I'm sure 4.19 would be more than tolerable to me at least....And as much as it costs to get geared believe me once is enough!!
You know exactly where I'm coming from then. It's not cheap lol
11-06-2012 01:41 PM
DevilDogDoc It'll be fine, I rolled for 2 years on 33's and 3.07, no fifth and passing sucked but I could go 80 in fourth just fine, so I'm sure 4.19 would be more than tolerable to me at least....And as much as it costs to get geared believe me once is enough!!
11-06-2012 01:37 PM
Derp
Quote:
Originally Posted by DevilDogDoc
I got mine geared and locked at the same time and I think the gearing has made a bigger impact on my wheeling than the lockers do, I flip the rear locker on and off all the time as I figure if I don't need it why keep it on right? The crawl in 4lo, 1st gear is amazing I can go down the steepest loose rock hills at just idle and in perfect control compared to before sliding down because I had to keep on the brakes....now on the street well I am driving like an ass again with my newfound power!!
:laugh: I bet that power is awesome huh. That sounds about right though. I think 4.10's will be okay until I go to 35's. I only want to gear once so gearing from 4.10 to 4.88 when the time come seems like a better option.
11-06-2012 01:30 PM
DevilDogDoc I got mine geared and locked at the same time and I think the gearing has made a bigger impact on my wheeling than the lockers do, I flip the rear locker on and off all the time as I figure if I don't need it why keep it on right? The crawl in 4lo, 1st gear is amazing I can go down the steepest loose rock hills at just idle and in perfect control compared to before sliding down because I had to keep on the brakes....now on the street well I am driving like an ass again with my newfound power!!
11-06-2012 01:24 PM
Derp
Quote:
Originally Posted by DevilDogDoc
Tell ya what, the OC isn't that far from my house, you come up anytime you want and I'll let you take mine out, we can even go pound a few trails down and you can see what you have been missing both on road and off.
Sounds good to me I've got 3.07's in mine right now and an 8.8 ready to go in with 4.10's and LSD. I'll be alright on 33's when they go on and I'll probably leave it alone until I go to 4.88's and 35's I suppose.

I have to say, the crawl ratio on yours is probably fantastic. Mine is horrible.
11-06-2012 01:15 PM
DevilDogDoc Tell ya what, the OC isn't that far from my house, you come up anytime you want and I'll let you take mine out, we can even go pound a few trails down and you can see what you have been missing both on road and off.
11-06-2012 01:13 PM
Derp
Quote:
Originally Posted by DevilDogDoc
That's my point, it's like your saying this is good when it's all you've seen, therefore there can be no better right? Sure 4:10 is tits compared to 3.07 if that's all you've tried but they are both crap compared to 4:88, but since you have never had it you wouldn't know would ya?
:shrug: nope.
11-06-2012 01:12 PM
DevilDogDoc That's my point, it's like your saying this is good when it's all you've seen, therefore there can be no better right? Sure 4:10 is tits compared to 3.07 if that's all you've tried but they are both crap compared to 4:88, but since you have never had it you wouldn't know would ya?
11-06-2012 01:09 PM
Derp
Quote:
Originally Posted by DevilDogDoc
See there's the problem with my uncles cousins old college roommate said it worked argument, it all sounds good until you have some actual experience with what your trying to talk about. 4:10 may sound good but only till you've tried something better....
It's not an it said it worked. It did work. 4.10's in my gpas tj was fine, but we had never seen better with 4.56: only had 4.10's
11-06-2012 01:08 PM
freeskier
Quote:
Originally Posted by Rubicon1968 View Post
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
I would definitely change the oil out between 500 and 1000 miles on new gears. I'm pushing about 750 miles on my new gears and plan to change the oil out over fall break. Minimal cost to remove metal particulates from break in.

Regarding gear ratio, I have 4.88 and 33s with the 5 spd. It is not to much gear. I'm actually not looking forward to the step up to 35s because I like the gearing so much.
11-06-2012 01:07 PM
DevilDogDoc See there's the problem with my uncles cousins old college roommate said it worked argument, it all sounds good until you have some actual experience with what your trying to talk about. 4:10 may sound good but only till you've tried something better....
11-06-2012 12:57 PM
Derp
Quote:
Originally Posted by Jerry Bransford
That's alright, some have been satisfied with 4.10 and 35" tires... usually because they hadn't driven a Jeep that was properly geared for that size tire.

One more thing to keep in mind... Jeep engineering geared the Rubicon to 4.10 for its 31" tires. In other words, Jeep determined that 4.10 was ideal for 31" tires right out of the factory. Can 4.10 be ideal for both 31" and 33" tires?

And if a person has never eaten a steak or even ever had a really good meal, they would likely be ok with eating nothing but rice and gruel... until they find out there is something better.
When you put it that way jerry that makes sense. High five to you for spinning it around for me.

I guess It's not really a leap of faith if this is the way It's supposed to be
11-06-2012 12:54 PM
Jerry Bransford That's alright, some have been satisfied with 4.10 and 35" tires... usually because they hadn't driven a Jeep that was properly geared for that size tire.

One more thing to keep in mind... Jeep engineering geared the Rubicon to 4.10 for its 31" tires. In other words, Jeep determined that 4.10 was ideal for 31" tires right out of the factory. Can 4.10 be ideal for both 31" and 33" tires? In other words, 4.10 may work for 33" tires but is it really ideal? Not really.

And if a person has never eaten a steak or even ever had a really good meal, they would likely be ok with eating nothing but rice and gruel... until they find out there is something better.
11-06-2012 12:36 PM
Derp
Quote:
Originally Posted by Jerry Bransford
Yep, not many Jeepers with a 5-speed/4.0L combo would consider 4.56 "too much gear" for 33" tires. When I was running 4.10 with 33" tires, I can vouch for the fact I considered 4.10 to be not enough gear and that I regretted not having gone with 4.56.

The only conceivable reason I can think of why some may not like the rpms of 4.56 with 33" tires is if they were just more used to the significantly lower rpms seen in a passenger car. Wranglers do need higher rpms with bigger tires than would be seen in any normal passenger car.
I'm a skeptical hippo on this one. 4.10 did my grand dads tj right on 33's and she still pulled plenty hard in 5th on the freeway at 65 ..... 4.56 seems a bit steep to me
11-06-2012 12:10 PM
Jerry Bransford Yep, not many Jeepers with a 5-speed/4.0L combo would consider 4.56 "too much gear" for 33" tires. When I was running 4.10 with 33" tires, I can vouch for the fact I considered 4.10 to be not enough gear and that I regretted not having gone with 4.56.

The only conceivable reason I can think of why some may not like the rpms of 4.56 with 33" tires is if they were just more used to the significantly lower rpms seen in a passenger car. Wranglers do need higher rpms with bigger tires than would be seen in any normal passenger car.
11-06-2012 12:07 PM
DevilDogDoc I run 4:88's on my 33's and there is no "too much" gear. I turn less than 3000 rpm at 65 mph, I don't see that as excessive it's right in the power band. I know when I go to 35's it will drop some and that's ok but I would be perfectly happy to run the way it is forever. Too much gear is like saying too much power!!
11-06-2012 11:58 AM
Derp
Quote:
Originally Posted by 3025826
Just thought I'd throw in my 2 cents, I have a 4.0L 5 speed and I would go 4.10s if you plan on sticking with 33s. I have 4.56 with 33s and it's simply too much gear. If i was towing it would make more sense but I burn more gas and shift quicker putting more strain on the clutch then I need to, so if you drive on road take my advice and 4.10s for 33's (idk about autos) Have had 35s, the 35s did great and are a good match I would say for 4.56 gears, I plan on upgrading back to 35s when I get new tires. Shifts at more reasonable rpms, 5th gear definitely is usable and 1-3 are much more comfortable. Offroad if you have a manual what could you possible need 4.88s for with 35s? Hope this helps some folks
I have to agree. Many claim 4.56 for 33's and 4.88 for 35's but I feel it is also too much gear. Those ratios and those tire combos make first unusable. My grandfathers tj had 4.10's and 33's and it was perfect. First was usable and so was 5th. I don't see going any lower than 4.10 on 33's unless you plan to go 35's in which case I would say go 4.56 and save for 35's.

Staying a tad higher on the ratio also puts a bit less strain on the axles and for those out their with a Dana 35 that's huge.
11-06-2012 11:53 AM
3025826 Just thought I'd throw in my 2 cents, I have a 4.0L 5 speed and I would go 4.10s if you plan on sticking with 33s. I have 4.56 with 33s and it's simply too much gear. If i was towing it would make more sense but I burn more gas and shift quicker putting more strain on the clutch then I need to, so if you drive on road take my advice and 4.10s for 33's (idk about autos) Have had 35s, the 35s did great and are a good match I would say for 4.56 gears, I plan on upgrading back to 35s when I get new tires. Shifts at more reasonable rpms, 5th gear definitely is usable and 1-3 are much more comfortable. Offroad if you have a manual what could you possible need 4.88s for with 35s? Hope this helps some folks
11-06-2012 11:48 AM
Rubicon1968
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
11-05-2012 11:10 PM
freeskier
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.
11-05-2012 07:28 PM
Rubicon1968 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..
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