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Author Topic: Tera 4:1 or SM420  (Read 7916 times)

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Offline jfrabat

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Re: Tera 4:1 or SM420
« Reply #15 on: July 16, 2009, 08:05:56 PM »
Quote from: Jeepn95yj on July 16, 2009, 07:28:33 PM
I agree with the tcase mod.  Too much work and not enough benefit from the SM420.

I run 5.13s in my '01 with an AX-5 and 33s.  Works out to be about 3000 rpm at 70 mph.  About perfect really

I used to run 4.88 with 31's (pretty much the same as 33's with 4.88) and it works FANTASTIC!  I miss being able to cruise up overpasses on 5th gear now that I put 33's on...

And I agree about the SM420...
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Offline sharpxmen

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Re: Tera 4:1 or SM420
« Reply #16 on: July 17, 2009, 08:38:25 AM »
probably the most elegant would be the klune like it's been mentioned before (or the crawl box mod for the 231) since would give you more than 1 low range - but doing that you will also need new driveshafts for front and rear. Not familiar with the SM setup, but probably it is a different length than your current tranny so you might need different driveshafts for that too. the fastest way to do it I would think is still the Terra 4:1 since everything else will remain the same.
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Offline neale_rs

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Re: Tera 4:1 or SM420
« Reply #17 on: July 17, 2009, 07:43:23 PM »
Thanks for the ideas.  The Tera 4:1 is definitely the most bang for the buck.  I think the Klune is edged out by an Atlas 4 speed, about the same cost and gearing and not as much work.
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'95 YJ, 33 x 12.5 mud tires, RE 4.5 ED lift, Atlas 4 speed, rear D44, ARBs front and rear, 4.56 gears, 8000# winch

Jeepn95yj

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Re: Tera 4:1 or SM420
« Reply #18 on: July 21, 2009, 02:55:11 PM »
I don't know why I keep thinking about it......because my Jeep works just fine as is......lol

but one day I'll probably add a crawl box into the mix.  If I do it I plan to leave the transfer case in the stock position and move the engine and transmission forward.  I'll need to figure out something for the shifter, though.  I'd like it to be in the stock location.

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Offline Jeffy

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Re: Tera 4:1 or SM420
« Reply #19 on: July 21, 2009, 04:05:30 PM »
Quote from: Jeepn95yj on July 21, 2009, 02:55:11 PM
I don't know why I keep thinking about it......because my Jeep works just fine as is......lol

but one day I'll probably add a crawl box into the mix.  If I do it I plan to leave the transfer case in the stock position and move the engine and transmission forward.  I'll need to figure out something for the shifter, though.  I'd like it to be in the stock location.
You will need to cut a new hole in the floor under the dash and then you can cut and extend the shifter so it comes back to the stock location.
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Offline FourbangerYJ

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Re: Tera 4:1 or SM420
« Reply #20 on: July 21, 2009, 04:24:24 PM »
Quote from: Jeepn95yj on July 21, 2009, 02:55:11 PM
I don't know why I keep thinking about it......because my Jeep works just fine as is......lol

but one day I'll probably add a crawl box into the mix.  If I do it I plan to leave the transfer case in the stock position and move the engine and transmission forward.  I'll need to figure out something for the shifter, though.  I'd like it to be in the stock location.



That is what I did when I had my Klune installed. It's moved 4 inches forward.

Just a new section of sheetmetal cut to fit. Sheetmetal screws hold it down.

I extended my shifter handle with a coupler nut and a bolt with the head cut off and bent to add length and comfort.

BTW mine was working fine too....now it works better ;)
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Offline neale_rs

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Re: Tera 4:1 or SM420
« Reply #21 on: July 21, 2009, 04:55:42 PM »
Those are some cool shifter knobs!

I´m leaning towards an Atlas II 5:1 at this point.  It would give me a 90:1 crawl ratio in first gear and then ratios in second, third, and fourth very similar to my current 1st, 2nd, and 3rd speed 4L ratios.  It seems just about perfect for my wheeling.
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'95 YJ, 33 x 12.5 mud tires, RE 4.5 ED lift, Atlas 4 speed, rear D44, ARBs front and rear, 4.56 gears, 8000# winch

Offline FourbangerYJ

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Re: Tera 4:1 or SM420
« Reply #22 on: July 21, 2009, 05:04:55 PM »
Quote from: neale_rs on July 21, 2009, 04:55:42 PM
Those are some cool shifter knobs!

I´m leaning towards an Atlas II 5:1 at this point.  It would give me a 90:1 crawl ratio in first gear and then ratios in second, third, and fourth very similar to my current 1st, 2nd, and 3rd speed 4L ratios.  It seems just about perfect for my wheeling.

The 5:1's are nice. Just wondering how much more the 4speeds are. If it's a few hundred more then just get the 4 speed. You will be much happier.
It's not all about the super low crawl ratio's. It's about having choices of crawl ratio's. Like you said you can use the tranny to change ratio's but with a underdrive added. You have that many more choices.
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Offline aw12345

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Re: Tera 4:1 or SM420
« Reply #23 on: July 21, 2009, 06:04:18 PM »
Amen to that if you spend the coin on an Atlas or stack get a 3 or 4 speed
a 2.73 ratio or there abouts is good for fun wheeling, a 4 or 5 to 1 is great for rock crawling. Actually the cats pyamas would be a box with a 1 tp 1 ratio a 0.8 to 1 ratio a 2.73 ratio and a 5 to 1 ratio that would be about as good as it would get for a 4 banger
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Offline neale_rs

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Re: Tera 4:1 or SM420
« Reply #24 on: July 22, 2009, 07:55:11 AM »
The four speed would be about $600 more for my application (the prices depend on several options).  Depending on the gearing option (10.34 low or 5.44), the crawl ratio would be either 185:1 or 97:1.  One thing to consider is the driveshaft work that might be required.  The 2sp Atlas would require a lengthening the rear DS several inches but the 4sp, depending on the rear output option, could end up either 1 inch shorter or 1 inch longer than what is in the Jeep now.  It might be possible to select one or the other and avoid a DS modification, making the actual cost difference a bit less.  Lots of variables to consider...
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'95 YJ, 33 x 12.5 mud tires, RE 4.5 ED lift, Atlas 4 speed, rear D44, ARBs front and rear, 4.56 gears, 8000# winch

BarneyJeep

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Re: Tera 4:1 or SM420
« Reply #25 on: July 22, 2009, 08:28:11 AM »
stak 3 speed, 5.44:1, 3.05:1, and 1:1, and cheaper then the atlas with the same outputs....

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Offline neale_rs

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Re: Tera 4:1 or SM420
« Reply #26 on: July 22, 2009, 08:39:47 AM »
Cheaper but it also has some complications. Something would need to be done to adapt the speed sensor and I would also need to do something about the vaccuum disconect (the cheapest way is a hose clamp and shaft balancing).  The Atlas seems more convenient for these details.  But these things may turn out to be easy to deal with in which case it would be a good option.
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'95 YJ, 33 x 12.5 mud tires, RE 4.5 ED lift, Atlas 4 speed, rear D44, ARBs front and rear, 4.56 gears, 8000# winch

Offline sharpxmen

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Re: Tera 4:1 or SM420
« Reply #27 on: July 22, 2009, 09:13:08 AM »
Quote from: BarneyJeep on July 22, 2009, 08:28:11 AM
stak 3 speed, 5.44:1, 3.05:1, and 1:1, and cheaper then the atlas with the same outputs....

never seen one in person but they look really good, i'm with you on this one
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Offline FourbangerYJ

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Re: Tera 4:1 or SM420
« Reply #28 on: July 22, 2009, 09:52:51 AM »
Quote from: BarneyJeep on July 22, 2009, 08:28:11 AM
stak 3 speed, 5.44:1, 3.05:1, and 1:1, and cheaper then the atlas with the same outputs....


One of the guy's in the club I run with has one. He has had alot of problems with his. Infact he sent it back to exchange for a new one. He still has issues with it. I'd stay with A Atlas...4speed

Quote from: neale_rs on July 22, 2009, 07:55:11 AM
The four speed would be about $600 more for my application (the prices depend on several options).  Depending on the gearing option (10.34 low or 5.44), the crawl ratio would be either 185:1 or 97:1.  One thing to consider is the driveshaft work that might be required.  The 2sp Atlas would require a lengthening the rear DS several inches but the 4sp, depending on the rear output option, could end up either 1 inch shorter or 1 inch longer than what is in the Jeep now.  It might be possible to select one or the other and avoid a DS modification, making the actual cost difference a bit less.  Lots of variables to consider...

Granted $600 is alot of money but look what you get for the extra money. Do the 10.34 not the 5.44 But I would imagine driveshaft mods would need to be made no matter which Atlas you end up with.
The Tera kit is not a bad deal either. Much cheaper, no DS mods.I found that I was either to low or not low enough. But if I had to do it all over again I would not have done a 4:1 in my 231 and just saved up for either the Atlas 4 speed or a Klune and stayed with the 231.
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Offline neale_rs

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Re: Tera 4:1 or SM420
« Reply #29 on: July 22, 2009, 11:38:38 AM »
So go all out with a 4sp Atlas ...  :pot:.   Well, it would be pretty awsome!  I'll have to save up for a bit longer...

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'95 YJ, 33 x 12.5 mud tires, RE 4.5 ED lift, Atlas 4 speed, rear D44, ARBs front and rear, 4.56 gears, 8000# winch
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