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Faz95XJ
September 30th, 2017, 12:55
Which do you think is better?

1. High pinion Dana 30 and Chrysler 27 spline 8.25 geared at 4:10.

Or

2. Low pinion Dana 30 and Dana 44 geared at 4:56.

Both sets will be locked front and rear. The 8.25 may get converted to 29 spline.

Also swapping in a Tera 4:1 with 2low if that affects any ones thoughts.

Will most likely be running about 6" of lift.


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RCP Phx
September 30th, 2017, 12:59
The LP D30 and the D44, hands down!

Serious Offroad
September 30th, 2017, 13:25
Too many variables.
Tire size
Type of wheeling planned
Mods need to install the D44 (perches, shock mounts, etc.)
And the biggie...BUDGET.

jeeptec
September 30th, 2017, 13:26
The one thing you did not state tire size. But anyway a high pinion 30 with 4.56 and Dana 44 with 4.56 is the best. But being the. Choice you have to pick from do the lp 30 and 44


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jeeptec
September 30th, 2017, 13:29
Oh by the way the 8 1/4 with 29 spline axles is a pretty strong axle. But limited aftermarket support.


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Jeep Driver
September 30th, 2017, 15:42
What lack of aftermarket support??

Gears, bearings, R&P, axles, and discs.........what are you lacking?

Serious Offroad
September 30th, 2017, 16:22
Oh by the way the 8 1/4 with 29 spline axles is a pretty strong axle. But limited aftermarket support.


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What?
I've gears up to 4.88, ARB and Detroit Lockers. AlloyUSA and Revolution Axleshafts.....


There's plenty of aftermarket parts for the 8.25" axle.

Sadly there aren't any Elockers or C-Clip Eliminators, maybe someday though.

jeeptec
September 30th, 2017, 16:40
Exactly no electric lockers or c clip eliminator kits.


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ehall
September 30th, 2017, 17:40
30-spline D44 is marginally better 29-spline 8.25, but the HP30 is significantly better than the LP30. Probably break the 30 more often.

Faz95XJ
September 30th, 2017, 17:57
Too many variables.
Tire size
Type of wheeling planned
Mods need to install the D44 (perches, shock mounts, etc.)
And the biggie...BUDGET.



Currently 33s
3 to 4 Times a year. Blue black trails at Rauch creek or equivalent.
Dana 44 is totally clean now. I have removed all previous bracket tree. Need to weld on U-bolt illuminators.
I currently own both sets of axles. Trying to do install on minimal additional dollars


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kcox506
September 30th, 2017, 18:28
Great thing about LP is you can tuck it up nicely at full compression if you're going for that lower center of gravity gig. Thats just my experience though. Pros about 4.10s are that they're a pretty thick cut gear. Would be hard to blow that. But as aforementioned, its all about what you're about.

Serious Offroad
September 30th, 2017, 19:20
Currently 33s
3 to 4 Times a year. Blue black trails at Rauch creek or equivalent.
Dana 44 is totally clean now. I have removed all previous bracket tree. Need to weld on U-bolt illuminators.
I currently own both sets of axles. Trying to do install on minimal additional dollars


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Auto Tranny - 4.56
Manual Tranny 4.10

Regear the HP to match the D44.
Sell the other two axles to offset the cost.

Heavyopp
September 30th, 2017, 21:52
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

techno1154
October 1st, 2017, 05:07
Which do you think is better?

1. High pinion Dana 30 and Chrysler 27 spline 8.25 geared at 4:10.

Or

2. Low pinion Dana 30 and Dana 44 geared at 4:56.

Both sets will be locked front and rear. The 8.25 may get converted to 29 spline.

Also swapping in a Tera 4:1 with 2low if that affects any ones thoughts.

Will most likely be running about 6" of lift.


Sent from my iPhone using Tapatalk

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

With a 4:1 transfer case it will be a very capable rig on the trail. 4:1 in the differential may be a good choice for highway runs.

srb531
October 1st, 2017, 06:13
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

trippled
October 1st, 2017, 07:58
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.

dan1977p
October 1st, 2017, 08:02
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.

RCP Phx
October 1st, 2017, 12:32
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".

burntkat
October 2nd, 2017, 12:32
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?

#S194
October 2nd, 2017, 13:09
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.

ehall
October 2nd, 2017, 13:24
Friend of mine here had the bronze bushings blow up, he's buying an Atlas

Faz95XJ
October 2nd, 2017, 13:34
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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Rod Knee
October 2nd, 2017, 14:39
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.

burntkat
October 3rd, 2017, 07:10
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.

VAhasnoWAVES
October 3rd, 2017, 07:26
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.

srb531
October 3rd, 2017, 11:07
you can always go w/ a np241 from a 03-06 tj/ lj rubicon 4.1 , super strong case, easy swap to a xj.

XJEEPER
October 11th, 2017, 16:17
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.

ArBrnSnpr
October 12th, 2017, 12:06
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.

Bourne
October 15th, 2017, 12:16
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.