$#@# leaking trans pan.

Unless you're doing super-extreme cornering or launches, a pickup extender isn't necessary. When using the new deeper pan, just add however much "extra" trans fluid (beyond the original capacity) is required to bring the level up to "Full" on the dipstick. Remember, the dipstick doesn't move when you switch pans; when it indicates "full" the fluid will be at the same level relative to the filter as it was in the old pan.