Tow haul mode

[I-H8-4Ds]

Quick question- I know that tow haul changes the shift points when activated, but was also wondering as well:

 

Does it increase line pressure all the time to prevent slippage?

 

Is the engine's spark advance curve and / or fuel mixture modified for increased load?

 

It's an 05 4L60E.

 

Thanks.

[Rammer]

Does it increase line pressure all the time to prevent slippage? No, only during shifts.

 

Is the engine's spark advance curve and / or fuel mixture modified for increased load? No, It's only transmission changes.