Have been thinking checking actual HP ratings, but before I go to my local performance shop for the test I was wonder how can this be done? If the rear wheels slip the front kicks in. Would I have to disconnect my front drive shaft? Even so when it detects total slippage, I (Think) it starts cutting fuel to eliminate spinning. Creating a traction control effect. Am I doomed to find out what my actual HP is?

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2000 Navigator. Laser Red, Every option. ,K&N FIPK , Superchip, True Duel Flowmaster 50 series. 2X SISO , vented out each side. Rear air deflector, Bug deflector, PIAA, headlights (SUPERWHITE)

Looking at Hitting 400 Hp without a blower. Using in addition, headers and duel CatBack. (If possible)
(Waiting for JBA to develope Headers)

“91” F150 4X4 Shorty “Ultimate Off Road Edition” Borge Warner T18 4 speed, Traction Lock Front and Rear Differentials., Smitty Built Duel Tube Roll Bar, Moog Super Off Road Coil Springs, Factory 2” Lift Rancho RS 9000 Shocks , Stock Front “QUAD SETUP” 33x12.5 (B.F. Goodrich) Mud Terrain Warn Winch Combo Bush Bar with Warn XD9000I Winch. Full Factory Skid Plates. 302 Long Block, K&N FIPK JBA Chrome Headers, Custom Catback using Flowmaster Muffler, Duel out side behind rear wheel.