I have 68 C10 with CPP column and 4L80E. The crack in the firewall was too small to route the cable where it was supposed to be. You can't bend the cable properly, otherwise it will get stuck in the sleeve. It looks more like a push/pull bar than a real cable. I was able to get it working, but I didn't want to risk ruining it and not being able to get it back. Excellent quality all round.