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Does anyone know if you can put a 97 or newer ZR suspension in the rear of my sled by just drilling four new holes. And can you only use a 121" because i've heard the newer 136" are to long. And is there any issues with the drive sprockets changing to a different size track???
 

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yes you can put a newer suspention in it all you have to do is drill new holes
the biggest thing is when you drill the holes make sure the track is going to set flat
i would think that you could put the 136 on it if it is a little longer you can always extend your tunnel
i put a m-10 suspention in my 02 zl 600 it had that smart ride in it those are junk
the best thing i ever did to the sled
check the track width if it is a little more narrow all you need to do is put some spacers in. if its wider it won't work it won't fit in the tunnel
 

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You will need to drill new holes 2" forward from the current ones. Any skid (121 if a short track, 136 if a 2 up) will fit with the current track.
 
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