I installed a pair a few years ago, they work great. Installation was nearly impossible. I ended up taking the TB in to a "official" seller of Timbrens and paid to have them installed. They even asked if I was sure if I had the right set (which I did). I think they used Pledge to lube up the ends of the Timbrens to aid in sliding them in place.
I bought some of these but I cannot get them to go into the cup. Soapy water, 2 jacks, 2 blocks of wood ... won't go in. Any ideas? The local Timbren-listed shop won't touch my Trailblazer, they only do semi's.
Just a thought: Clean out and smooth the inside of the cups. Line up the bumpers, get the jack in place, saturate the rubber with brake cleaner and jack fast. The brake cleaner makes the rubber slippery but evaporates fast.