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Discussion Starter #1
I was wondering what effect EFI tunign has on the tow/haul transmission mode and how it all interacts with say a turbo brake EFI tow tune? Also, does the EFI tow tunes with turbo brake change the shift points of the tow/haul transmission mode?

I have used my truck to tow a 6k camper and put it in tow mode, but really thought it shifted too high with that mode. I realize if I was pulling over 10k it would help keep EGT's down. Maybe I just don't reall need it for that weight, but I do like the braking and the fact that the torque convertor locks earlier from what I've read on here.

Thanks!
 

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I'm That Guy...
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Use tow/haul if you are towing, the turbo brake is vane position on the turbo, it has nothing directly to do with your TCM or shift points.
 

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the only was to do the tranny is with a TCM tune.

the turbo break works by kicking in within a certain rpm range that the truck typically only goes to while in tow/haul
 

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Discussion Starter #4
Sooooo, if I have the EFI tow tune with turbo brake (close vanes) it will only work with the tow/haul mode on?
 
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