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I just purchased a 2016 SP 800 154 with 2.5 inch track. I'm wondering what is the difference besides the skis and the paddle height of the track with the T3 version? Can I just change to a 3 inch paddle track later? Does the T2.5 use the same chain case and drivers as the T3?
 

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Can you add a 3" to a standard summit ... yes , but it's not a direct swap ( you'll need new drivers)

Does the standard have the same chain case and drivers ... NO

The T3 has a drop and roll chain case and 7 tooth drivers , this makes for pretty impressive clearance at the front cooler to clear snow from the tunnel. You will not have this much room on a standard summit with 3" and smaller drivers.

The T3 also has the skid dropped down out of the tunnel about 1" or so. Not sure if the front suspension is any different than the standard summits... thought the spindle was taller but can't recall.
 

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the front suspension is also taller, I put my T3 shocks on SP and they barely fit.
 
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