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  #41  
Old March 31st, 2009, 03:16 PM
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Quote:
Originally Posted by ini88
Shawn I put Ashcroft 4.11s in this weekend and so far I like them! I wouldn't put them on a truck with 33s though because I can feel them almost top out on 35s. It is nice to climb hills again!
Here is a really cool resource for determining differences in gearing/tire combinations, and it even has a listing for the Land Rover R380 and LT230 transfer case (so you don't have to manually enter all of these ratios).

It breaks out alot of different calculations and allows a side to side comparison between to set-ups. For example, it shows the difference between the stock axle ratio with stock tires and 4.11's with 33's at various RPMs, in each gear..

3,000 rpm, 5th gear, 3.54's, 32" tires = 74 mph
3,000 rpm, 5th gear, 4.11's. 33" tires = 66 mph


Quote:
Originally Posted by Buckon37s
That is really, really nice of you to say. Thanks.

Just to prove that I am not all angry all the time:

There is a gear oil out there that has been proven to actually prevent shock related failures. It works like a "thrust block" of sorts. As well as reducing wear on Arb's and gears. It's Amsoil Severe Gear 250 synthetic. It goes for a staggering $16 a quart. But, it actually works. I would recommend that you guys that go the GBR way and wheel give it a look. Those gears are right on the edge of what they can take all the time on 35's, so every trick is worth exploring.
Wonder how RedLine's Shock Proof gear oils would compare, sounds like the same concept...
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  #42  
Old March 31st, 2009, 04:19 PM
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Quote:
Originally Posted by jeepeytr
Wonder how RedLine's Shock Proof gear oils would compare, sounds like the same concept...
It looks the same, but the web mentions that this has less drag, which is a good thing. The 250WT is like molassis. Crazy thick. I do know that the Amsoil has actual rockcrawling field testing. The product was recommended to me for KOH by Team Redbull. Maybe next time I will try the Redline. I won't need to change my gear oil for another 10 years though.
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  #43  
Old April 2nd, 2009, 12:14 PM
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Quote:
Originally Posted by jeepeytr
3,000 rpm, 5th gear, 3.54's, 32" tires = 74 mph
3,000 rpm, 5th gear, 4.11's. 33" tires = 66 mph
I did some calculations and found out some cool info I never new before between 4.11, 4.75 gears and a Defender's 1.41 and Disco 1.22 transfer case.

If you run 4.11s with the Defender 1.41 transfer case it is the same as running 4.75s with a Disco 1.22 transfer case with any size tires in high range. The advantage is to run the Disco t-case though if you want to off-road and also keep it drivable on the road because on road the speeds and rpm are the same.

The low range is the same between the Defender and Disco transfer cases' - 3.32. So then you are running 4.75s with a 3.32 low range with the Discovery transfer case as opposed to 4.11s with a 3.32 low range Defender transfer case. Your crawl speed will be less with the Discovery transfer case.

I like calculators
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  #44  
Old April 2nd, 2009, 12:42 PM
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And that 1.2's work great for diesel defenders.
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  #45  
Old April 2nd, 2009, 12:48 PM
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Quote:
Originally Posted by ini88
I did some calculations and found out some cool info I never new before between 4.11, 4.75 gears and a Defender's 1.41 and Disco 1.22 transfer case.

If you run 4.11s with the Defender 1.41 transfer case it is the same as running 4.75s with a Disco 1.22 transfer case with any size tires in high range. The advantage is to run the Disco t-case though if you want to off-road and also keep it drivable on the road because on road the speeds and rpm are the same.

The low range is the same between the Defender and Disco transfer cases' - 3.32. So then you are running 4.75s with a 3.32 low range with the Discovery transfer case as opposed to 4.11s with a 3.32 low range Defender transfer case. Your crawl speed will be less with the Discovery transfer case.

I like calculators
Ops.. It is a nice tool, but an inaccurate one apparently. I didn't even look to verify if the ratios it plugged in were correct, but apparently they are not, or at least not well enough differentiated between. I'll drop the admin an e-mail, but NAS D90 T-cases were 1.22 high range boxes, same as the Discovery, as JSBriggs has noted..


Quote:
Originally Posted by JSBriggs
Daniel, keep in mind the NAS 90's have the same 1.22 ratio as the Disco's. The 1.41 were for the diesel Defenders.

-Jeff
I think the '93 D110's also had 1.41 high range boxes as well, didn't they?
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  #46  
Old April 2nd, 2009, 12:52 PM
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Yeah, NAS 110 has the 1.4
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  #47  
Old April 2nd, 2009, 01:08 PM
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Quote:
Originally Posted by JSBriggs
Daniel, keep in mind the NAS 90's have the same 1.22 ratio as the Disco's. The 1.41 were for the diesel Defenders.

-Jeff
ah ok. so the diesel and NAS110s where the 1.4s? damn. So then the only difference in t-cases is the stupid solenoid then.
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  #48  
Old April 2nd, 2009, 01:24 PM
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Quote:
Originally Posted by ini88
ah ok. so the diesel and NAS110s where the 1.4s? damn. So then the only difference in t-cases is the stupid solenoid then.
It is a good concept though. I used a 1.41 T-Case in my 5-speed discovery years back to compensate for the increased tires size. While it didn't gain me anything in low range, it was essentially the same as running 4.11 R&Ps, and was the perfect gearing for the street. I never did anything hard core with the Discovery (had the Defender for that), but the gearing seemed perfectly fine off road as well. With 235/85-16 tires, the discovery turned 3,000 rpm at 70 mph, and towed our boat (about 3,500 lbs in total) very well. I miss my Discovery
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  #49  
Old April 2nd, 2009, 01:32 PM
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Quote:
Originally Posted by ini88
I did some calculations and found out some cool info I never new before between 4.11, 4.75 gears and a Defender's 1.41 and Disco 1.22 transfer case.

If you run 4.11s with the Defender 1.41 transfer case it is the same as running 4.75s with a Disco 1.22 transfer case with any size tires in high range. The advantage is to run the Disco t-case though if you want to off-road and also keep it drivable on the road because on road the speeds and rpm are the same.

The low range is the same between the Defender and Disco transfer cases' - 3.32. So then you are running 4.75s with a 3.32 low range with the Discovery transfer case as opposed to 4.11s with a 3.32 low range Defender transfer case. Your crawl speed will be less with the Discovery transfer case.

I like calculators
I did exactly what you are saying. I changed out the 1.4 to a 1.2 tcase with 6.2 gears and 40s. I hit ideal rpm at around 65. But can hit close to 80 wound out but only for seconds! I don't need faster than that in the desert.

The only flaw in the idea is the 4.77 gears for rovers are crazy weak.
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  #50  
Old April 2nd, 2009, 10:40 PM
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So, I am going with the 4.14's from GBR. This seems like a good choice for me.
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  #51  
Old May 4th, 2009, 11:50 PM
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The gears are in, and I have to say that they made a noticeable improvement in driving. I wouldn't say that they brought it back to a stock like driving experience, but it is definitely better. I feel like the truck is more in the power band while on the highway, and it definitely can climb hills without having to downshift too much. The gearing change was definitely needed. My truck is not a slug anymore, and I was actually able to pass a slow car today.
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  #52  
Old May 5th, 2009, 07:53 AM
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4:14's? What size tires are you running?
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  #53  
Old May 6th, 2009, 12:53 PM
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255/85
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