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post #1 of (permalink) Old 08-26-2001, 05:41 PM Thread Starter
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various methods of gearing correction and $$$

Hey All,

I was asking about putting 31" tires on my Zuk the other day and wildweasel pointed out that without gearing correction of some kind I would be sucking wind on the hills around here. He mentioned a "baby lobster" or a 4:16 transfer case. I know R&Ps can be changed as well.

I have a couple questions to clarify some of this info for myself. I hear about rocklobsters and baby lobsters but I dont now what this is, exactly. It doesn't appear to be a product available on any of the vendor sites I visit. By the same token, I also read in here about GRS1 and GRS2 transfer cases and I don't think I have run into these, either. Are these commercial products or something that is just a popular DIY mod using common pArts or something? I know what a transfer case is (DUH), so at least I dont need that explained to me. Would one make their existing transfer case a 4:16 T-case with purchased parts, is it a core trade purchase item?

On a Zuk with 31" tires and a stock motor, what is the best way to modify the gear ratios for PRIMARILY STREET use? What is the cheapest way? I know this mod is going to happen sooner or later, so I am just interested to know some more basic facts to fill in the holes in my knowledge.

Thanks for any help!

~daxe

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post #2 of (permalink) Old 08-26-2001, 06:16 PM
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Re: various methods of gearing correction and $$$

Stick some 5.12's in it and be done. Putting a GRS I or a baby lobster in it won't help the on-roadability much as it mainly reduces the low range ratio, with a very slight reduction in high range gearing.

I have a GRS I and run 31's on the road, and it sucks, 5th is just about useless until 65, and once I'm there I can't maintain 65, so I have to downshift to 4th again, where I wind the snot out of it. When I ran the 29's I could cruise at 75 no problem (ask mxnhid) and even passed a camper going uphill on the way home. Wooohhhoooo, I thought I had a little screamer there for awhile. With the 32's (off-road Swampers), 5th is completely useless.

BTW, I pulled the S/R of the Zuk and will bring it down this weekend for the Fab Fest. I took pics, but it's such a simple setup there's no way to put it on backwards.

JEEPN
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post #3 of (permalink) Old 08-26-2001, 06:35 PM
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Re: various methods of gearing correction and $$$

31 inch tires will definitely sap power and driveability from your Samurai, especially if your motor is relatively stock. You can drive with 31's and stock gearing, but it will be better if you can correct the gearing. There are many options:

Transfer Case:
stock: high range: 1.41 low range 2.27
Baby Lobster/SJ-410: high range: 1.58 low range 2.51
4.16/GRS1/Rockcrawler: high range: 1.58 low range 4.16
GRS2: high range: 1.66 low range: 4.89

You can combine the t-case with the following ring and pinion gear ratios. I hope I'm not forgetting any:
3.73 (stock)
3.91 (SJ-410)
4.11
4.30
4.57
4.63
5.13
5.38
5.63
5.83

The ring and pinion gears only reduce the gearing by a fixed percentage, whereas a transfer case can reduce the low range much more than the high range, allowing for correction of bigger tires on the highway but much improved gearing off-road. And considering that you can get a set of 4.16 t-case gears for about the same cost as a pair of ring and pinion gearsets, the t-case is the obvious choice.

For 31-inch tires, I would recommend the 4.16 t-case, as it gives you the most gearing for the money. You'll be just about back to stock gearing for the street, but your off-road experience will be tons better than you're used to.

I hope this helps!

-- Geoff Beasley

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post #4 of (permalink) Old 08-26-2001, 07:27 PM
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Re: various methods of gearing correction and $$$

Check out the calculator at http://home.off-road.com/~wsjc/calculators.html, it's a good one. It'll fill in one area if you fill in the other 5 requirements.

If you want your Zuk to do 75 mph, with the stock gearing it'll run at 3,888 rpm's with 205's on it. If you put 31's on it and want it to perform the same, it'll need 4.27 gears. If you put a GRS I on it, it'll be running at 3,809 rpm's with the 31's, very close to stock.

Also keep in mind not all tires are exact in size, so it'd be best to measure them to get an accurate measurement. Play around with it, you'll get a good idea of what will work and what won't.

JEEPN
Winter Harbor, Maine
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'88.5 Zuki, 7" Lift, Locked, Swamped, Rolled, and just generally broken in right!
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post #5 of (permalink) Old 08-26-2001, 08:53 PM Thread Starter
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Re: various methods of gearing correction and $$$

>>>>BTW, I pulled the S/R of the Zuk and will bring it down this weekend for the Fab Fest. I took pics, but it's such a simple setup there's no way to put it on backwards.

Now THIS is good news. That means there's half a chance I could have the thing in by Zookin 2K1! I have looked at so many pics of these things being put in, and it really is such a simple deal, that I feel like I could actually tackle it myself without ruining anything or getting killed.

Thanks, Mark!

~daxe

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post #6 of (permalink) Old 08-26-2001, 08:55 PM Thread Starter
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Re: various methods of gearing correction and $$$

>>>I hope this helps!
-- Geoff Beasley

Thank you. It does help and is terrific stuff to know, but I still haven't heard from anyone WHERE to get a 4:16 T-case. What kinda $$ are we talkin for one of these units?

~daxe



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post #7 of (permalink) Old 08-26-2001, 09:14 PM
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Re: various methods of gearing correction and $$$

hey man, you can get the 4:16 gears at many vendors. tim tacket sells calmini's on the east cost. brent at trail tough, glenn at rro, gary at pw....
brent n glenn get $399 last time i looked at their sites. dont know on gary, tim or calmini.
BiLLy bOb


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post #8 of (permalink) Old 08-28-2001, 09:24 PM
 
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Re: various methods of gearing correction and $$$

4.16 T-case reduction gearsets are $400-$450 from the various vendors. The GRS2 gears give more reduction in high and low
range and will correct nicelyt for 31" tires without having to resort to changing ring and pinions.The only problem is that it's twice
the price as the others.
Just mentioning another option.


rollerskate
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post #9 of (permalink) Old 08-29-2001, 07:02 AM
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Re: various methods of gearing correction and $$$

Although a little pricy, but worth it in the long run, would be the KLUNE-V. If you price the 4.16 t-case, R&P's front and back and install kits, the KLUNE-V is in the general ball park.

T-case gears - $400 - $500
R&P - front - $180 - $250
R&P - rear - $180 - $250
R&P kits - $ 60 - $140
-----------
$820 - $1140
DOn't forget S&H coss. Also, if you don't know how to set-up R&P's or install t-case gears, then shop costs come in too.

Now a KLUNE-V costs about $1500, but beauty is all the stock gearing remains. Is an underdrive and adds a new layer of gear reduction upon the old. And keeping the stock gearing is a smart thing to do, as a 3.73 R&P is much stronger that 5.12's, and the t-case proper was designed to take the stress of the stock gearing, not the 4.16's.

Junk food for thought.

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post #10 of (permalink) Old 08-29-2001, 08:06 AM
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Re: various methods of gearing correction and $$$

Okay show me where I can buy a Klune-v with sami adapter for 1500.00 You been sniffing glue again Tim? (As in its a bad week to quit sniffing glue..) try $2500.00 all said and done. The base price for the unit is 1800.00 plus the sami install kit, 850.00 or so. So no its not that close, Wish
it was.

Glenn
87' Zook Spoa,M/L 33's, 4.16 tcase,4.62 gears Camo,Header,2"exhuast, Cam.
Lockers, 8klb winch, -Wildweasel2 NE4WI- club http://www.cs.umass.edu/~glenn/personal.html
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