Something is making a thumping sound with my track (just installed a 1.25" ripsaw) when I am slowing down on my 92 Indy 650. It really seems to start thumping when I get to about 35 and will continue untill I stop. It doesnt matter if I am coasting or hitting the brake, but will go away as soon as I hit the throttle. I think it has something to do with not getting enough snow because if I run through deep snow it will go away for a bit but then come back if I run on a hard packed trail. I can best describe this thumping sound by comparing it to a flat spot in a car tire. It jerks the whole sled and as I slow down the time between thumps gets longer. Anyone ever have this problem before? Thanks Oh and I double checked my Track alignment and it seems perfect.