Wont shift at wot

[400ss]

2008 Silverado 5.3L 4 speeds,, now it has a 6.2L engine. it runs pretty good, shift ok under normal conditions but at WOT it will pass the 6000 RPMS and it would not shift to 2nd gear, i need to release the accelerator to allow the trans to shift to 2nd gear.. those are the current tunes on the truck..

what do i need to look into?

[ls1mike]

When mine did this the transmission output speed was off even though the dash read correctly.

[400ss]

Any help please???

[joecar]

I'll look at the files later today...

[400ss]

thanks

[joecar]

I'm running a day behind...

[joecar]

I take it that the shift pattern used is "Normal"...?


D1101 Normal WOT 1->2: 47 mph ---> what is that in rpm...?

Try this (assuming Normal shift pattern):
- lower D1101 to say 40 mph;
- lower D1061 to say 35 mph;
- lower D1021 to 5500 rpm;

retest with those to see if you get the WOT 1->2 shift; and then incrementally adjust them back up until your see the WOT 1->2 shift at the desired rpm

( always keep D1061 below D1101, and likewise for other table pairs ).

[400ss]

Ill try it tomorrow, thank you very much i really apreciate it, im on the learning curve rigth now, i do the best i can because i can read english 100 %, speak it like 60 %, understand it if i read it 100 %,,, im from mexico and i think im the only one that has efilive here where im from. i have a shop, custom swap, mostly using LS engines, thats why im using efilive rightnow, and i love it

[joecar]

No worries :cheers: cool.


Make sure your VE and MAF are correct so that the PCM can calculate engine torque correctly... the PCM uses engine torque to calculate the transmission line pressure;

keep an eye on the pids TRQENG and TFMPRS, make sure these go up sufficiently as engine load goes up (to prevent internal slipping in transmission).