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Klune Underdrive



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Old 07-27-2011, 06:55 AM   #1
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Klune / Black Box Underdrive

Anyone use one of these?

Here's a link to some info:

http://www.offroaders.com/directory/...ts/klune-v.htm
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Old 07-27-2011, 08:36 AM   #2
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They are expensive at just under 2k. I would run a doubler. Cool little units though.
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Old 07-27-2011, 10:13 AM   #3
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Check out Our BlackBox, and Compare the Two.

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Old 07-27-2011, 11:37 AM   #4
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Old 07-27-2011, 01:10 PM   #5
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X3 I may have a line on a used doulber set up Micheal
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Old 07-27-2011, 06:17 PM   #6
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X3 I may have a line on a used doulber set up Micheal
So is it a secrete? LOL I'm interested if you know of one.
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Old 07-27-2011, 07:23 PM   #7
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Bought a Black Box.

Right now in low range final drive in 1st gear I'm at 37.81.

With everything in low range final drive in 1st gear is going to be 103.23.

They had everything except the out put shaft so I should see it in three weeks.

This is going to be cool!
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Old 07-27-2011, 07:30 PM   #8
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Old 07-27-2011, 07:36 PM   #9
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I think I can lock the torque convert with a switch and some rewiring of the valve body so, when I'm in low range at 103 it will be like a just like a standard transmission. How cool will that be??
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Old 07-27-2011, 08:53 PM   #10
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How cool will that be??
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Old 07-27-2011, 08:56 PM   #11
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Old 07-28-2011, 07:16 AM   #12
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Here's a link to the Box:

http://www.northwestfab.com/blackbox.html
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Old 07-28-2011, 07:34 AM   #13
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Gear Calculations

My buddy is telling me I'm wrong about the final drive.

I come up with 103.23. He is coming up with 75.35

3.06 1st gear (2.73 Black Box) (2.71 t case) (4.56 gears)

He just wants to add the two 2.7's instead of multiplying them.

He said it works for a 203-205 set up.

I told him it's 5th grade math and he wouldn't understand:

(using round numbers ) 2+2=4 as does 2x2=4.

However 2.7+2.7=5.4 but 2.7 x 2.7=6.48.

So am I'm I out to lunch on this one or not?

I used the gear cal: http://www.grimmjeeper.com/gears.html

I bet him a buck. Hope I'm right I don't have one left to give him.
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Old 07-28-2011, 07:52 AM   #14
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You are correct
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Old 07-28-2011, 07:53 AM   #15
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You are right but you lose a little with your bigger tires. So those 4.56s are more like 3.73s with 44s. It would be more like 84:1
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Old 07-28-2011, 10:16 AM   #16
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Mike,

Thanks for the Order!!

I am sure you will be Extremely happy with your New BlackBox!

Get ready to CRAWL!!!

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Old 07-28-2011, 02:16 PM   #17
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Final Drive

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You are right but you lose a little with your bigger tires. So those 4.56s are more like 3.73s with 44s. It would be more like 84:1
TC,
I agree with you the big tires hurt with overall torque to the outside of the tires. And it is like having lower numerical gears when compared to a rig with smaller tires.

But because the final drive ratio is calculated at the axle, tire size has nothing to do with this number. It is still 103 to 1.
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Old 07-28-2011, 03:11 PM   #18
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I think you will be pleased with it Micheal. you started linking the rear yet?
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Old 07-28-2011, 05:57 PM   #19
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But because the final drive ratio is calculated at the axle, tire size has nothing to do with this number. It is still 103 to 1.
I agree with you....folks are thinking too hard when they try to throw tire size into account when figuring gear ratios.

I have never seen a set of gears in a set of tires,in the hubs sometimes,but never at the tires.

So....tire size,brand,age,or value have little to do with gear ratios IMO.
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Old 07-28-2011, 07:51 PM   #20
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I think you will be pleased with it Micheal. you started linking the rear yet?
I have the link material, The ends should be here tomorrow. I have had 2 cars back to back on the lift for major body work. (5 weeks straight) Soo soon very soon. I do most of the work on mine on the weekends. I would like it to be done for the Iron Man in Sept if I have enough money left to go!

Hows your buggy coming?
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Old 07-28-2011, 08:13 PM   #21
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Re: Klune Underdrive

I have the 2.7 klune, it is awesome with 120.65 final drive ratio, in 2wd low it will spin the tires on pavement without touching the gas...
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Old 07-29-2011, 04:28 AM   #22
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I have the 2.7 klune, it is awesome with 120.65 final drive ratio, in 2wd low it will spin the tires on pavement without touching the gas...
Got any pics or vidios? How about the rest of the truck? What trans and t case do you have? How long have you had it?
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Old 08-01-2011, 08:23 AM   #23
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I've been running a 2.72 Klune for 6 years in two different rigs. It holds up great, I can clock the t case where ever I want, doesn't leak, gearing is perfect. The cable shifters last about 1-2 years then they wear out. I also had to replace the detent plunger assembly do to it popping out of gear.

Klune to 205
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Old 08-01-2011, 08:48 AM   #24
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Freking sweet I love the mount you made!!

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I've been running a 2.72 Klune for 6 years in two different rigs. It holds up great, I can clock the t case where ever I want, doesn't leak, gearing is perfect. The cable shifters last about 1-2 years then they wear out. I also had to replace the detent plunger assembly do to it popping out of gear.

Klune to 205
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Old 08-01-2011, 02:15 PM   #25
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Thanks!!
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