Hi, sorry for the delay, not been on for a bit, I must admit after the first few uses it certainly is a fantastic bit of kit! Unfortunately spares seem thin on the ground, I think front and rear diffs started to overheat, the front diff pulley is damaged but I managed to get another 33t diff set from the YR4 M2 as they were the same, but the output shafts are different. The rear was salvageable but the front needs the output shafts and I can use the rest of the front diff kit for the YR4 M2. Thanks for the reply though!