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Old 09-11-2007, 04:26 PM   #1 (permalink)
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Do 4:1 gears....

Do 4:1 gears for a Dana 300 t-case make that much of a difference? Ive heard the LoMax are better than TeraLow but are much more expensive. I already have the 258 together with the 6:1 T18. Would i get that much more out of it? I can find Teralow's for around $450. I still have the stock gears in mine.
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Old 09-11-2007, 04:31 PM   #2 (permalink)
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Old 09-11-2007, 04:59 PM   #3 (permalink)
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I tried to wheel with just 4.88's in my tj on 33's, and it just wasn't enough. Since the 4-1 kit, I am very happy. I know I'm not close to your first gear ratio, but it still will be a huge improvement in crawl ratio for you.
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Old 09-11-2007, 05:40 PM   #4 (permalink)
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http://www.grimmjeeper.com/gears.html

Run the numbers side by side, and see the difference.
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Old 09-11-2007, 06:14 PM   #5 (permalink)
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Old 09-11-2007, 07:59 PM   #6 (permalink)
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Does it do everything you want it to right now? If you find places where you say to yourself "Self, I'd like a lower gear in this situation", buy the low gears. If not, leave it alone.
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Old 09-12-2007, 08:52 AM   #7 (permalink)
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I went with the LowMax 4:1 kit and love it! If you're a rock crawler, I'd bite the bullet and do it now
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Old 09-12-2007, 09:28 AM   #8 (permalink)
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Gears are one thing, but adding the 4:1 will make a huge difference.
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Old 09-12-2007, 09:54 AM   #9 (permalink)
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your high range is 1:1 your low range is 2:1 ....... from 2:1 to 4:1 is the same amount od reduction as shifting from high to low...
ie if 1000 rpm is 5 mph in high then it is 2.5 in low and would be 1.25 mph with the 4:1 thus you have half the speed and twice the torque in the same gear at the same rpm from the 2:1 to the 4:1
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Old 09-12-2007, 10:04 AM   #10 (permalink)
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The LoMax's are a One Pice construction versus the TerraLow's which are a 2 piece design that is pressed and welded. Personally I have seen 2 sets of TerraLow's fail. Sure they are warantied, but personally I wouldnt want to deal with it. When I get to the point of wanting the extra gear, its LoMax all the way for me.

Oh, and Yes, having the extra gearing is worth it
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Old 09-12-2007, 10:20 AM   #11 (permalink)
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well I just read that the d300 has a 2.62:1 low.... if that's so then my earlier post is partly wrong... same gain over high but not as much gain over stock low ..... sorry
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Old 09-12-2007, 10:37 AM   #12 (permalink)
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You would go from about 70:1 to 109:1. My sami was 116:1 and it was stupid low, but it had zero torque so it was necessary. My Jeep is currently in the neighborhood of 40:1 and it isn't nearly as bad as it sounds. I think 70 would be good for me, but it depends how "hardcore" you are.
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Old 09-12-2007, 05:08 PM   #13 (permalink)
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Actually I have been considering putting a Terra Low 4.1 in my CJ 5. With the 4.56s in the diffs, and an AMC V8 bolted to a wide ratio T18, the motor is turning 3000 rpms at 65 mph. You feel like you should shift up another gear long before you get to that speed but there isn’t one to shift to.

My thought is with that low an x-case, I could put taller gears in the diffs and have some better road manners, but still be “low enough” for the mud and the sand around here.
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Old 09-12-2007, 05:21 PM   #14 (permalink)
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No don't do it! I'm tired of getting stuck behind all the guys that are too lazy to shift and creeping along along with some silly crawl gear.
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Old 09-12-2007, 08:09 PM   #15 (permalink)
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I love mine. I'm running the teralow 4to1 in my dana300. (I got a WICKED good price on the teralow stuff) sm465 and 4.10 gears in the axles, my low crawl is like 107 which is awesome.
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Old 09-12-2007, 08:20 PM   #16 (permalink)
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well, i dont know if its worth the money because my crawl ratio is already pretty damn low with the low granny gear in the tranny(T18). Maybe ill go too low? Thanks for the comments and keep em coming please.
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Old 09-12-2007, 08:30 PM   #17 (permalink)
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No such thing as too low!

In my book there is no such thing as too low of gearing, you can always use a higher gear in the transmission.
One exception to this rule is the lower your crawl ratio, the more parts you can break if you abuse the skinny pedal.
I like the lower ratio so I can just idle over about anything, keeps from breaking stuff.
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Old 09-13-2007, 06:09 PM   #18 (permalink)
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so is LoMax the way to go? Are they seriously alot better?
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Old 09-13-2007, 06:36 PM   #19 (permalink)
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6.18x4.0x4.56=112.72 good number for 35's to 37's
I'm running a 99.47 with 36's and it's just right. The truck doesn't stall and I can ride the brakes and get it going.
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Old 09-13-2007, 06:37 PM   #20 (permalink)
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Quote:
Originally Posted by PizzaFarno View Post
...Are they seriously alot better?
http://www.jbconversions.com/pages/p...max/index.html

Check out the beef on the LoMax gears...You decide if it's worth the money or not. You can get TeraLow stuff at a fraction of the cost of the LoMax, but....Depending on how you wheel, you might be throwing $$$ out the window...

I installed the TeraLow 3:15 gears in my Dana20 Tcase, because other than the Bronco/Dana18 conversion there is no other mfg of lower gearing for the 20. There used to be someone, O'brien?, I can't recall that made better gears for the 20, but I don't know if he's still around or not.

I have no 'real world' experience with them as yet. But the install was easy, although I had to grind a bit more than was expected on the inside of the case. The most difficult part was getting the end play set correctly on the output shafts.
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Old 09-14-2007, 07:44 AM   #21 (permalink)
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To be honest if you feel your rig is already to low, then dont bother. It also depends on what type of wheeling you do. If your blasting sand and mud all the time, dont bother.. You need wheel spin, if your crawling rocks then I say do it but remember use second gear, no one likes to get behind people that have ultra super stupid low and use it on the trail because they dont know have to drive at a speed above 3 miles an hour on basiclly a dirt road.

I went from 40, to 60, to 80, to 112, to 145 and in some spots its ok, in others I would like lower.

Right now I have great combination of gears at my disposal with a 7.05 first and 5.13s in the axles I am at 145 in first and 75 in second. For trails like the rubicon I am typically in second or third, For trails like the hammers second and sometimes first.
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Old 09-14-2007, 10:19 AM   #22 (permalink)
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I have the terra 4:1 and its sweet. The LoMax stuff is stronger andi f you got the $$ go for it. If you are on a budget the Terra stuff is plenty strong for all around wheeling.
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Old 09-14-2007, 10:27 AM   #23 (permalink)
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I have the LoMax but I have never heard anybody break the Tera gears. The LoMax was on sale when I bought it. I consider 4:1 mandatory for manual Jeeps with 4:1 1st gear in the tranny. But you don't have 5 gears so you need to do the math and compare the final ratios in every gear. After I looked at the calculations I found I paid for one extra gear below my old 1st gear in low range. 2nd thru 4th matched my old 1st thru 3rd pretty close.
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