6l80 and smaller tires.

[pl4yboy]

Why does this happen? Are shift points set up by rpm?

The truck must reach two requirements for the tranny to shift. One is MPH, the second is RPM. Now, you can zero out either table there and go strictly off the other, but in this case, it doesn't matter. If you put smaller tires on, the truck is going to think it's at a higher RPM than it is, because the tires revolve faster sending more VSS pulses. The truck needs to have tire size changed in the tune to correct for these pulses. If not, it'll short shift. Rob had a few problems with this at SAR last year because his slicks were so much shorter. He was shifting 500 RPM early.

[00Z71]

The truck must reach two requirements for the tranny to shift. One is MPH, the second is RPM. Now, you can zero out either table there and go strictly off the other, but in this case, it doesn't matter. If you put smaller tires on, the truck is going to think it's at a higher RPM than it is, because the tires revolve faster sending more VSS pulses. The truck needs to have tire size changed in the tune to correct for these pulses. If not, it'll short shift. Rob had a few problems with this at SAR last year because his slicks were so much shorter. He was shifting 500 RPM early.

Weird since it is not meeting the rpm requirements... Wonder if it has to do with the speed limiter moved to calibration from GM

[1BadCC]

Can you put the slicks tune on the tow haul? Were you can have your stocks on and everything be normal. Then click the tow haul on once you put the slicks on

[George C]

not correctly

Can you put the slicks tune on the tow haul? Were you can have your stocks on and everything be normal. Then click the tow haul on once you put the slicks on

[11 6.2]

Can you put the slicks tune on the tow haul? Were you can have your stocks on and everything be normal. Then click the tow haul on once you put the slicks on

That would be nice if it was like that but like quik said, not correctly

[1BadCC]

Well i was hoping for the best. Guess im going to be selling my current wheels i was going to use for slicks(17s) since the tallest tire i can find for them is a 28.