QUOTE(BuddyP @ Mar 29 2007, 11:29 AM)

54 pitch track? do you mean 54 lug track? If so it's probably a 136" if it's a 2.52 pitch track.
Depends on what exactly you want to get into with drag racing. Longer track will give you better hood up and the sled will stay flatter. If your only running a stock motor at the mid 100hp range or less you shouldn't need anything longer than a 121 unless you have transfer issues. You don't need much transfer if your running grass or ice.
Basically it comes down to this...
1. Is this sled your trail sled also? Or race sled only?
2. What classes do you plan on running?
3. What's done to the sled currently?
4. What do you plan on running on, snow, grass or ice?
Sounds to me like he's got alot more than 100 hp, i think he needs to buy a .5 (half Inch lug track) X 136
. also when your sled wants to turn either to the left or to the right you need to adjust your track, example if it's turning to the left! either need to tighten the left side rear idler adjustment bolt to a tighter position or loosen the right side, or something like that!!
Good luck my friend