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Stretching a 120" to a 137"


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#1 clatla

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Posted 18 November 2013 - 07:58 AM

I am wondering who out there has stretched their 120 to a 137"? Did you have to do more than rail extensions? Did you have to extend the tunnel also? Any pics of after would be helpful.

Thanks in advance.



#2 doo32

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Posted 18 November 2013 - 10:44 AM

You will need rail extensions and tunnel extension ordered my tunnel extension thru tracks usa and rails from mmp but think mmp is out of business


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#3 Medina

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Posted 20 November 2013 - 02:21 PM

i'd put a whole 137 suspension in it



#4 GD-Hook

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Posted 20 November 2013 - 06:27 PM

120 to 137 track extension kit from tracks usa.. You will need the tunnel extension too..

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  • 2013-10-19 11.57.57.jpg


#5 GD-Hook

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Posted 20 November 2013 - 06:28 PM

fully installed

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#6 GD-Hook

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Posted 20 November 2013 - 07:29 PM

I think it was 855 + tax and shipping..  that's with the 1.6 ice cobra.. I think you get free shipping in the states..

 

The extensions look pretty strong, I think the weak link is the rails, reinforced mine a bit (see pics)



#7 UPMICHIGANDER

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Posted 20 November 2013 - 09:43 PM

Ive had a few friends with rail extensions who beat their sleds harder then most and never broke the rail or extension.

#8 LRD

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Posted 21 November 2013 - 10:51 AM

Here is my 9 page thread on doing this, http://www.dootalk.c...ull-wet-450lbs/
I did mine in the fall of 07 on my 08 TNT so no aftermarket parts available, made my own rail extensions and tunnel extensions.
At this point it weighs 365 lbs dry and has a 15 X 141 X 2.25 3" pitch track. Am also building an 09 TNT into 137
for my wife but using rail and tunnel extensions from Tracks USA with my old 16 X 137 X 1.75 track.

I do my long track conversions a bit different from most and have done it this way since my first one in 1990. I move the skid back 3" to 4" to try and get a track approach angle as soft as the mtn skids. A steep angle of attack in powder will trench a lot more instead of climbing up on top of the powder. A soft angle planes out more like a boat hull on top of the powder.

I use shorter rail extensions in the back and bolt the a-arm in the tunnel 3 to 4" back from
short track holes in tunnel. Takes some very careful measuring and marking and most work is making new drop brackets for the rear arm as they will need to go to the rear an identical amount.

If you never plan to ride serious powder in the mtns this wouldn't be of much help. Or if you don't mind getting stuck more.

Good Luck

#9 Etonia2007

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Posted 11 January 2015 - 10:08 AM

Extensions from SLP and Track USA are 7.5" for 136" tracks....we been trying to swap 137" onto REV (with 2.86 drivers) but 136" kit isn't long enough for 137" track.....can't find a extension kit for 137" track...custom rails are $500+ so don't want to go that way....SLP suggested moving entire suspension back in tunnel....possible but practical ? Any suggestions ?


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#10 doo32

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Posted 11 January 2015 - 01:31 PM

install big wheel kit to compansate


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#11 djm

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Posted 11 January 2015 - 07:48 PM

install big wheel kit to compansate

 

Or offset axle with stock wheels.. to move the wheels back. 



#12 IronDog800

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Posted 17 July 2016 - 09:46 PM

How's it ride on & off trail? Any problems with it? I'm looking at doing the same thing

#13 stefano9

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Posted 20 July 2016 - 04:23 PM

I extended my 120 to a 137 for last winter using tracks Canada (same as tracks usa). Parts were great quality and fit and finish was excellent. I got both the rail and tunnel extention. One issue I did run in to on the first ride was constant overheating. Therected was a dead space behind where the heat exchanger finished and where the tunnel was extended with the kit that had few inches of ice and snow build up in that area.

I ended up having to purchase a renegade heat exchanger used and cut out the tunnel extention so the heat exchanger dropped right in. It was unexpected work but the end result was totally worth it
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#14 AlanLaporte

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Posted 01 August 2016 - 04:41 AM

I had the same overheat issue in low snow conditions. I also broke the the skid infront of the extension.  Had to rebuild and reinforce the skid to handle the extra leverage the extensions put on it.  So my words of advice don't jump it and ride in deep snow and you will be good.



#15 GR1MxREAPER

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Posted 13 August 2016 - 12:47 AM

if you have the extra cash buy the track and tunnel extension from tracks USA and buy renegade 137" rails and run big wheel kit or an offset wheel. seen some videos on youtube about PInes powersports in canada using offset axle to run a 156" on a freeride instead of 154 and it worked. So you could run a 137 with 136 rails or extensions for sure. search freeride 156 on youtube and it should come up.


Edited by Lookin 4 a 600 RS, 13 August 2016 - 12:47 AM.





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