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  #16  
Old October 1st, 2017, 07:58
trippled trippled is offline
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Re: 4.10 versus 4.56

Having run both on 33s with an auto, I'd go 4.56. not much difference in highway rpm but pulling hills was way easier. Not sure how steep the hills are around there but there's a few good passes here where it helps.
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  #17  
Old October 1st, 2017, 08:02
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dan1977p dan1977p is offline
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Re: 4.10 versus 4.56

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Originally Posted by Heavyopp View Post
Is anyone taking into account that OP is in Virginia, wheels in Pennsylvania -- Gotta be a 4 hour drive

Is 33's geared at 4.56 comfortable at highway speeds of 75 - 80 MPH -- how about fuel economy with the higher RPMs?

I'm thinking 4.10 would be better for the daily driver/highway driving of everyday use -- sure 4.56 in the trails would be better but you have to get there 1st

I'm purely speculation -- I have my 1st XJ, want to run 33's but I like to travel north from NJ to NH -- About a 5 hour drive, most at highway speeds of 70+ MPH -- I'd love to hear some thoughts on this
Not a problem, honestly. I ran 4.88ís on 33ís running 80 down the interstate for hours with no issues and around 14mpg. Same mpg I got stock.
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  #18  
Old October 1st, 2017, 12:32
RCP Phx RCP Phx is offline
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Re: 4.10 versus 4.56

Don't let some these guys scare you! I've got 17 yrs on my LP D30 and Tera-flex 4:1 case with no issues(none). I've been thru the Rubicon, Moab, Ouray, and the Black Hills, but I "rock crawl" and do not "rock race".
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  #19  
Old October 2nd, 2017, 12:32
burntkat burntkat is offline
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Re: 4.10 versus 4.56

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Originally Posted by srb531 View Post
the teralow 4.1 kit is well known to have problems, just hope you are aware. otherwise if a 4.1 is in the tc i would go 4.10 s . but i would still use the hp 30 & the 44
What are the problems with the Teralow kit?
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-90 XJ 4.0, AW4, 231J: Clayton's longarms, RE 5.5" coils, hybrid 6" leaf pack, 33/12.50/15" MTs, Rancho 99012s and 99624s, Tera HD SYE, custom sliders, BW flares. Rehabbing with D44s, RE spring packs, RE 4.5" coils, and ACOS.
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  #20  
Old October 2nd, 2017, 13:09
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Re: 4.10 versus 4.56

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Originally Posted by burntkat View Post
What are the problems with the Teralow kit?
The planetary gear set will sometimes self destruct. There is a bronze bushing in there which does not like high RPMs. Terra recommends not exceeding 2800 RPM in any gear so as to keep the bronze bushing from self destructing. I ran one for a while, never had an issue. Ran Redline synthetic ATF fluid in it. Sold the case to someone else, that person still runs it.
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  #21  
Old October 2nd, 2017, 13:24
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ehall ehall is offline
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Re: 4.10 versus 4.56

Friend of mine here had the bronze bushings blow up, he's buying an Atlas
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  #22  
Old October 2nd, 2017, 13:34
Faz95XJ Faz95XJ is offline
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4.10 versus 4.56

Thanks for the feedback. I trailer it to the events that I go to.... well as long as I am able to borrow a truck and trailer. Been lucky in that front over the last year and 4 events.
I've heard about the Tera issues but came across this one and figured I'd give it a shot.


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  #23  
Old October 2nd, 2017, 14:39
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Rod Knee Rod Knee is offline
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Re: 4.10 versus 4.56

On my 33's, 65 mph is about as fast as I need to go. I have a vehicle built for going slow. Usually when the question comes up as to use 4.10 or 4.56, the tire size in question is 32 inch. My vote is for the 4.56 ratio.
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  #24  
Old October 3rd, 2017, 07:10
burntkat burntkat is offline
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Re: 4.10 versus 4.56

Quote:
Originally Posted by #S194 View Post
The planetary gear set will sometimes self destruct. There is a bronze bushing in there which does not like high RPMs. Terra recommends not exceeding 2800 RPM in any gear so as to keep the bronze bushing from self destructing. I ran one for a while, never had an issue. Ran Redline synthetic ATF fluid in it. Sold the case to someone else, that person still runs it.
Interesting.
Shouldn't be hard to spec out a better bushing.
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-89 S-10: SAS, D44s front/rear. 5.7L V8. 700R4 with 4L60E upgrades. Built in my driveway.
-90 XJ 4.0, AW4, 231J: Clayton's longarms, RE 5.5" coils, hybrid 6" leaf pack, 33/12.50/15" MTs, Rancho 99012s and 99624s, Tera HD SYE, custom sliders, BW flares. Rehabbing with D44s, RE spring packs, RE 4.5" coils, and ACOS.
-94 ZJ: Budget boost, 31s. The wife's DD.
-97 XJ: Son's DD. 4" lift, ACOS, 4" spring pack, Upcountry coils, 31s
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  #25  
Old October 3rd, 2017, 07:26
VAhasnoWAVES VAhasnoWAVES is offline
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Re: 4.10 versus 4.56

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Originally Posted by burntkat View Post
Interesting.
Shouldn't be hard to spec out a better bushing.
the bushing is only have the issue. the other half is oiling.

at high RPMs it suffers from oil starvation. this is why tera does not recommend it for high RPM applications. if you like mud, hill climbs, sand, or going fast and doing so in low range... the tera kit is not the kit for you.
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  #26  
Old October 3rd, 2017, 11:07
srb531 srb531 is offline
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Re: 4.10 versus 4.56

you can always go w/ a np241 from a 03-06 tj/ lj rubicon 4.1 , super strong case, easy swap to a xj.
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  #27  
Old October 11th, 2017, 16:17
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Re: 4.10 versus 4.56

Since you operate your rig in sub-2500ft elevation, 4:56's with an auto is my suggestion.
Ive run this combo at my elevation (4300 street -10,000ft trails) and 4:56's suck on the freeway. I've run 4:88's with 33's /auto trans for 9 years and never regretted this gearing choice. 75mph =2850 RPM =16mpg on a 215k mile engine.
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  #28  
Old October 12th, 2017, 12:06
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ArBrnSnpr ArBrnSnpr is offline
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Re: 4.10 versus 4.56

I run 33's (Well, 285/75/16's actually, but close enough) A HP30 with a Detroit TrueTrac and a D44 with a factory Trac Lok.

I run 4.5" of lift and have a WJ brake and OTK conversion up front.

I have 4.56 gears installed and I have zero complaints with driveability.

On the freeway at 60 mph I'm at 2,100 rpm. There's sufficient power for passing and the fuel economy is reasonable for what the vehicle is intended for.

I did a lot of research before choosing 4.56's and I would go with them again if I were to build another XJ.
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  #29  
Old October 15th, 2017, 12:16
Bourne Bourne is offline
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Re: 4.10 versus 4.56

Quote:
Originally Posted by Rod Knee View Post
On my 33's, 65 mph is about as fast as I need to go. I have a vehicle built for going slow. Usually when the question comes up as to use 4.10 or 4.56, the tire size in question is 32 inch. My vote is for the 4.56 ratio.
I have 4.56 gears and 32" (31.5" actual). It runs about 300 rpm over stock, which helps on hills.
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