DA BIG ONE
12-06-2007, 04:51
After all the time I spent to get better transmission control of a 4L80e after switching from 4.10s to 3.42s it now appears the PCM needs to be reflashed for the newer gearset ratio so transmission control is corrected to the ratio change. One programmer says hacking VSSB does fix speedo but it does not re-calibrate ABS or transmission control for ratio change. There seems to be an ABS re-calibration requirement for larger dia tires too.
GM Upfitters manuals show that year 1999 3.42 gearsets were an option on all GM C/K chassis configurations. However, transmission and engine oil coolers are required for all C/K series w/3.42 gearsets.
I'd like some feed back on this.
GM Upfitters manuals show that year 1999 3.42 gearsets were an option on all GM C/K chassis configurations. However, transmission and engine oil coolers are required for all C/K series w/3.42 gearsets.
I'd like some feed back on this.