4.11s vs 4.71s - Defender Source
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  #1  
Old July 1st, 2013, 11:27 PM
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Jason Lavender
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4.11s vs 4.71s

Long story short, blew up my front diff wheeling this weekend at Rausch. I've been running an old-school setup of 4.70 Series gears, which has worked great off-road as it's given me some nice "crawler" gears on the trails...but admittedly running 3300+ rpms on the highway to get to the trail has not been ideal (but I've made it work). And I knew the strength of the gears was not there, so it was only a matter of time before the diff would do what it did this past weekend.

Now I'm faced with obviously re-gearing regardless since I want to go to something more stout (like the bigger-toothed ring & pinion gears of modern times). So I'm having this internal tug-of-war between going with something like an updated 4.71 (or maybe 4.43) OR going down a notch to something like a 4.11 (or 4.14). It's an expensive "mistake" to make, if I end up being unhappy with a 4.11 performance on the trails just to drop some highway rpms.

Currently only running 255 tire (33s), and tough to tell what the future may bring since I have been happy with the size - but of course the possibility of going with a "bigger" tire could potentially be there (though not at the moment).

Thoughts/input/etc? Anyone run these various setups (i.e. 4.11 vs. something like a 4.71 or similar) over the years, and have any preference/input/etc? My biggest fear is dropping $$ on something like a 4.11 setup, only to find myself missing the 4.71-ish ratio I used to have. Though I would likely regain some hearing loss attributed to countless hours spent behind the wheel at 3375rpms with my 4.70s.
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  #2  
Old July 1st, 2013, 11:59 PM
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I don't have any real life experience to help, but this nifty calculator is fun to play with

http://www.ashcroft-transmissions.co...atio_calc.html

I will need advice shortly with the same type of question
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Old July 2nd, 2013, 12:13 AM
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I've had both in RRCs with 33" tires and I think I would split the difference if you are going to do lots of offroading. 4:30, 4:43.
Lots of highway I'd go with 4:11.
I broke the rear 4:75's ring gear and I wasn't ever particularly fond of them anyway.
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  #4  
Old July 2nd, 2013, 01:38 AM
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I'm running 4.11's with stock tires on my daily driver. The 4.11's do provide a comfy crawl speed in low-range.
I wish I had 33's because my top speed is about 75mph.

In a D90 that's probably a good thing.
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  #5  
Old July 2nd, 2013, 01:53 AM
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4.11s are a happy balance for highway and trail use, especially if you plan in driving to Rausch or other distant events.
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  #6  
Old July 2nd, 2013, 06:17 AM
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Have you thought about 4.71s with a higher ratio tcase? It would only change your high range. Instead of 1.2 go with 1.003. Kind of average it out.
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  #7  
Old July 2nd, 2013, 06:25 AM
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Or buy Craig's giant truck and trailer the Rover.
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  #8  
Old July 2nd, 2013, 06:39 AM
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J, with 4:11's and 33's I do 80 on long hauls with rom's hovering a little under 2200.
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  #9  
Old July 2nd, 2013, 10:57 AM
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Quote:
Originally Posted by mgreenspan View Post
Have you thought about 4.71s with a higher ratio tcase? It would only change your high range. Instead of 1.2 go with 1.003. Kind of average it out.
Actually that is one of the scenarios I've been pondering, but of course that seems to be the most expensive (I'm sure a 1.003 itself would run $2K-ish). But in a perfect world, that would in fact give me the best of both scenarios (crawler gears offroad, decend rpms on road).

------ Follow up post added July 2nd, 2013 10:59 AM ------

What are peoples' thoughts on the 4.14s? Why is it that people don't run those over 4.11s, especially given the fact that they're supposed to be a stronger gear (7x29 tooth count versus 9x37).
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  #10  
Old July 2nd, 2013, 11:12 AM
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Quote:
Originally Posted by nathanwind View Post
(I'm sure a 1.003 itself would run $2K-ish).
Huh? A used T case is maybe $400, a complete rebuilt one maybe $1000. Say about $350 delivered for the gear set, http://www.ashcroft-transmissions.co...ewCat&catId=70
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  #11  
Old July 2nd, 2013, 06:27 PM
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If you swap a 1.6 as your core with Ashcroft it's cheaper. I only paid 595 GBP when I swapped a 1.6 for the rebuild core. They had about a 1 week turn around for the LT230 when I dropped it off in and picked it up in person. I can't imagine you spending $2k to get one. L8 sells a 1.003 gear kit from Ashcroft listed at $500something. Check their site.
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Old July 2nd, 2013, 07:34 PM
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I'm running 4.12 Ashcroft gears on my 35's with Ashcroft lockers. I ran the calculator linked above and this is what it came down to.
- 4.12 gears and 35" tires are closer to stock than where I was on 32" tires and stock gears
- Truck is noticably quicker.
- I think its a good balance since I drive the truck anywhere I go to wheel
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Old July 3rd, 2013, 12:02 AM
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It should be quicker. You increased your tire size 9% but your gearing by 16%.
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  #14  
Old July 3rd, 2013, 10:00 AM
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Damn you are being stubborn on this. Whatever you do, don't cloud the issue with facts by using the gearing calculator with the different gear and tire sizes, and definitely don't drive a truck with 4.11 gears to see how you like/dislike it!
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Old July 3rd, 2013, 10:21 AM
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Originally Posted by cgalpin View Post
Damn you are being stubborn on this. Whatever you do, don't cloud the issue with facts by using the gearing calculator with the different gear and tire sizes, and definitely don't drive a truck with 4.11 gears to see how you like/dislike it!
I only offered twice this past weekend to let him roll in mine!
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Old July 3rd, 2013, 10:42 AM
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Yeah I offered yours to him several times as well since mine is auto with different t-case gearing

I hope none of the dripping sarcasm got on you.
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  #17  
Old July 3rd, 2013, 02:57 PM
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Since when do I ever do things the "easy" way? But yes, I probably need to take Huff's for a spin, should have done it this past weekend though admittedly 'you don't mow another man's lawn' is a credo I live by .
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  #18  
Old July 6th, 2013, 08:54 AM
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I went with GBR 4:14's reverse cut, ARB lockers, 285's KM2; really pleased with on road performance as it is geared better than stock for the mountains in 4 th gear. I do wish I had a bit lower gear for crawling as I finesse the clutch somewhat on the most technical sections (or brake & accelerate just above a stall). Colorado '95 D-90
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  #19  
Old July 6th, 2013, 09:38 AM
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Jason, don't forget that those CO NAS guys are down to 149 hp at home and 128 hp when playing around in the mountains. They NEED 4:11s just to help compensate for the lower air density with all else being the same.
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Old July 6th, 2013, 09:43 AM
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Quote:
Originally Posted by PMKColorado View Post
I went with GBR 4:14's reverse cut, ARB lockers, 285's KM2; really pleased with on road performance as it is geared better than stock for the mountains in 4 th gear. I do wish I had a bit lower gear for crawling as I finesse the clutch somewhat on the most technical sections (or brake & accelerate just above a stall). Colorado '95 D-90
It's statements/data like the above that make me think the 4.43s would be the best of both worlds.
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