This ^^^^^ X1000. In the Torqueflite, the release of the bands is very important to speeding up and firming up shifts. That's one reason why I always recommend cast rigid bands instead of flex bands. It's not the apply time, but the release time that's important. Some kits don't speed up release time. This can result in shifting into the next gear while momentarily still engaged in the previous gear. This can actually give a "false firm" shift and make you THINK the transmission is shifting firmly, when in fact it is in two gears at the same time for an instant.
Shift kits are an important piece to the performance transmission puzzle. By raising line pressure and reprogramming the valve body that enables the clutches to have more holding pressure since the line pressure is increased. The kit also speeds up shifts so there is less flare up between shifts.
Go to Allpar.com and read Tom Hand's (VOETOM) article on the Torqueflite. He gives very descriptive information with fluid flow charts as to exactly what's going inside a Torqueflite. What they need in terms of performance usage and why. It's one of the best articles ever written on the Torqueflite far as I'm concerned.
