Extremely Hard WOT Shift 1-2

[Jackpine]

Originally Posted by MileHigh04SCREW

Jack,

Thanks for the info. I have tried that as well. I found -8 to -10 between gears 1&2 (*edit* at WOT) gives a solid transmission shift with little to no "lurch". However, this also leaves me with a soft shift shudder under normal driving conditions. I hear bad things about shudders. Again, it's only for 1-2 shifts. 2-3/3-4 are great and always have been.

I wish I could post a hi-res video of what is happening...

This has no relevance to Timing does it?

-MileHigh

No, it shouldn't relate to timing I think.

I suspect this is something Bill can adjust for in a custom tune though. He not only adjusts the "firmness" setting that you can play with, but he also adjusts line pressures and the torque dive that occurs in a shift. I'd guess one of these needs changing. I'm sure he can put an updated tune file on the server for you when he gets time.

In the meantime, though, do what Longshot suggested. Simply load the custom tow tune you have, DO NOT make any custom option changes and try that one. You can use it with the higher octane gas, so that's not a problem.

If the truck shifts more to your liking, Bill would need to know this, and, if there's no improvement, that's important data too.

- Jack