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Idahome
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96-97.5 had GT40 heads, 97.5-01 are gt40p
98+ is returnless fuel
They all use the 4r70w automatic 1996-2001
The trans has 30 spline 6 bolt Ford output allowing the use of several different t cases
The BW4404 AWD t case is a 35/65 power split, it uses clutches and they burn up and create heat, full time power sucker MPG killer made for soccer moms
As soon as you ditch the AWD in a 5.0L Explorer and install a real t case, 2ed, 4hi and 4low you will see what I am talking about. They go from soccer mom suv to a real truck just like that. MPG goes up, passing power returns, and wear and tear on front tires, bearings and cv axles is noticable. Steering feels lighter, its is just a much better setup.
You can use manual t cases
1356
np205
4406
Or e shift 4406
and install a smaller fuel tank (explorer sport) and a stand alone 4x4 electronic control module (Motorolla box from 04+ Fords)
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I build custom RBV, specializing in drivetrain conversions, wiring, suspension and complete custom trucks