Start in second gear tune.

[duramaximizer]

I was pretty sure. I was told it was like the old fords. It was a built in traction control feature. Tell me if I am wrong.

[DmaxHawk]

I tried it this afternoon and it didnt really feel like it started in 2nd...im not sure just a rough test

[jpowel29]

The 6spd Allison will not start out in second (even in manual mode) but you can use the TCM tuning to get the second gear launch. You can really get some rpm for a healthy boosted launch. It can definitely be hard on the trans.

[Big Mike]

This is the I used. When I start to build boost to lauch you can feel it shift into 2nd around 1200 RPM. If your driving it around it will shift into 2nd asoon as your tires move. This is done in the TCM.

part throttle 1-2 shift = all zeros
part throttle 2-1 downshift = all zeros
full throttle 1-2 upshift speed = all zeros
full throttle upshift rpm = all 200's or something less than idle rpm
full throttle 2-1 downshift speed = all zeros

How has that worked for you on the street J? I've been considereing doing this strictly for my daily driver (8.1) in the normal shift mode as it doesn't need 1st gear in order to pull out from a signal light when empty. First always feels too low for DD situations.

[jtaylor111]

I really would like it as a daily driver IMO. You could try it and see what you think. If you dont like it you can see pull the shifter down to 1st or select it.

[Big Mike]

Thanks, I think I will give it a try then as soon as I get a few more things smoothed out in both my engine and trans tune.