To come right out and say it, Ford's Automatic Overdrive transmission hasn't been held in high regard among the go-fast 5.0 crowd.
Folks like to say the valve body is an automatic transmission's brain.
If so, then Precision Industries valve body shift kit is a brain transplant. Instead of the typical, weak, welded tabs, the billet cover uses mounting ears whittled right out of the cover material. Bird or F-series with stall speeds franging from 2200 to 4000 rpm. With more clamping force comes a need for increased holding force. The direct clutch pack is upgraded with a seven clutch disk pack utilizing Kolene steel plates.