I have two G8's that have had issues now with holding second gear. Both are 400+HP with 2800 stalls and both fall out of second gear under power. Has any one else had this issue or know a fix? The transmission holds the power fine initially but as soon and the rpm stop accellerating, it seems to drop line pressure and then the trans wont hold the gear anymore. Then when the rpm jumps, so does the line pressure and it grabs the gear again.
If you look at the scan, look for when it is in second at WOT. If you watch, the rpm flash's and the car accellerates then there is a couple rpm spikes. If you watch the MPH is isn't wheel spin. Also you can monitor the table display and see there is no commanding clutch for anything else to be happeneing. I have tried raising the base line pressure tables without and luck. Or maybe I just haven't put in the right number.......yet.......