This is the website I found the information on.
http://www.w8ji.com/tko_600_shifting_problems.htmAnd here is an excerpt from that page, that I found the most useful. Although the whole page is worth a read in my opinion.
Liberty's Gears
It was evident Tremec was not going to be helpful and I did not want to start changing clutch parts when there was no hint they were bad (they were all new) or they would not work.
My second call was to Paul at Liberty's Gears in Taylor, Michigan. I found Paul to be a professional and experienced with excellent knowledge of transmissions and mechanical systems. Paul did not act surprised to hear about a TKO 600 2-3 shifting problem. Paul said he worked on hundreds of TKO 600 transmissions that would not shift from 2nd to 3rd gear, and said my description of it being like "hitting a wall' was typical of a common shift rail system problem. His mechanical descriptions made perfect logical sense to me. He also claimed a nearly 100% success rate in curing the 2-3 shift problem.
I decided to let Liberty's Gear take a shot at the repair on my brand new transmission. I removed the top cover assembly and rear housing. I sent Paul everything related to moving the sliders in the transmission. I did not send gears or synchronizers.
In less than week Paul shipped my parts back.
After reassembling the transmission (took about one hour) and reinstalling the transmission (took about three hours) I pulled my car out onto a local test track. I wound the engine up in 2nd gear to about 6000, and pushed forward with a normal "palm shift" I use on more difficult spring loaded shifters. Using a very fast clutch in-and-out, the TKO 600 transmission went into 3rd gear flawlessly! This was the very first try with the Liberty's modified parts, and it was a flawless shift. This was the first time I could get the TKO transmission into 3rd under full power! I made about three more tries using various shifting techniques, including a "point and push" into 3rd. Every shift was flawless. Finally I ran a wide open throttle run from first, shifting at 6300. 1-2, 2-3, and 3-4 were all flawless very fast shifts. Since then I have driven the car several times, and never missed a shift.
I was totally blown away by the difference in shift feel. While it was not like a Hurst Competition Plus or even a standard T-5 with its single rail internal shift system, it actually felt like a pretty good shifting system. The brick wall "won't go in third with a sledge hammer" feel was gone.
**Thought it would be some useful information for anyone considering swapping to a TKO system, or even for those that already have it.**
