installing a 151 track on my 03 viper- it has currently a 144 track with 121 skid with extensions. i have a pro mountain 144 skid that im installing. have any tips? i wanted to slide the skid back- anyone have mounting locations for this? also what approach angle should a try to get? this sled performs great with the 144, do you think i will have to reclutch or regear? thanks