I was tired of my 166 that has 1500 pluss miles on it so i tried a new 377 last weekend and was not happy. old belt would turn 8400 on clicker 3 new belt maybee 7200, messed with deflection and clickers nothing worked max i could get out of it was 8000 i found a used 166 from a buddy stuck it on and instantly back to normal. sled is a 07 xrs with a team secondary.