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in my 01 i have o/d off is that the same as tow/haul on the 3rd gens cuz it seems to do the same thing could somebody explain please
 

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No, it's not the same. The 3rd gens also have OD off. Push the button once -- tow/haul, push it a second time-- OD off.

Tow/haul changes line pressures in the valve body to cause lock up in 3rd and 4th gears.

OD off is just that-- doesn't allow the tranny to go into overdrive.
 

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No, it's not the same. The 3rd gens also have OD off. Push the button once -- tow/haul, push it a second time-- OD off.

Tow/haul changes line pressures in the valve body to cause lock up in 3rd and 4th gears.

OD off is just that-- doesn't allow the tranny to go into overdrive.
That's only on the newer ones. Mine is just a tow mode switch. Mine doesn't have 2 positions. It seems to just be an O/D kill as far as I can tell.
 
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