Can a 4l60e be built to handle 600 fwhp these days?
I know sonnax brought out alot of hard parts to remedy alot of there strength issues but has anyone actually built one and had it last at this or more hp?
Multiple options for full manual
Easiest way is a single 5 pin relay and some wiring at the external harness. This will use the pressure switch manifold to operate the solenoids. Works as full manual. Gives you the ability to easily return to automatic shifts in the future should you desire.
You can use a kit like transgo to make a fwd full manual
I'd stay far away from the vacuum modulator setup that they have replace the epc