me and a buddy tried it last night in the sled and it was still binding, so i looked at the gear chart and it shows it will work with 35 driven gear with a 68L or a 39 driven with a 70L.. i can see how it would work with the larger bottom gear because the chain wouldn't make contact with so many teeth on the top compared to having the 37 on the bottom, hope this makes sence..lol.. anyways just got in with the 23 thanks Josh..