I once did a clutch job on a FJ60. Spent about 2 days on it and with help the second day. Late afternoon Saturday thinking all is good and when I engage the clutch - nothing. I was mentally and physically whipped. Drove home that evening running through all possibilities for the problem. Decided I had installed the clutch disc backwards. Next day pulled everything apart only to discover all the clutch components properly installed. Put it all back together. I had left the t-case in neutral