i love my 4.56s. Will be putting them to good use this coming weekend towing the travel trailer about 200 miles.

 

The Advanced trans Tuning feature is available for 2004 and up 4.7L and 5.7L engines. 2004 offered a PCM that continued to be used up until 2011. That was the main reason why we chose to start there.

Scott

 

Ok, thanks, looks like ill just have to get a shift kit/new valvebody/tq converter when the time comes. Is the 3815 the best choice for my truck, and if i wanted custom tuning?

 

If you want custom tuning then for your year/engine it's an SCT from Hemifever...

 

Alright cool I will look into it. Also an update on the gears, I should be changing the gear oil soon since I just hit the end of the break in period. I forgot to mention that now when the truck hits 65-70mph the speedo starts to wobble slightly and the brake and abs lights come on. Should I start by replacing the speed sensor?