I'm having a problem with a 1999 Silverado converted to gen IV with TBSS ECU. Motor is a 6.0 with a SC. As soon as you start to move the transmission shifts second third forth by the time i reach 25 mph. Nothing i have seem to change makes any difference. I'm sure its something stupid.
Tune is very earlier, i have just started attempting to MAF tune.
Thanks in advance.
Restart 07052017.1.hpt2009 tbss.Layout.xml1999 silverado gen iv 07052017 MAF.1.hpl
Last edited by ss44; 07-05-2017 at 01:44 PM.
2005 GTO A4 - Crate LS3 480HP - 3200 stall
1999 SIlverado A4 - 6.0 LY6 - 4l70e - 2800 stall - 4.10 Locker
Any solution yet SS44? My 4L60E behind gen 3 LS6 is doing the EXACT same thing. When I did a data log I could see it shift into 2nd @ 4mph, then 3rd by 7mph and 4th by 11 mph. I'm hoping you have a solution.
Chuck in AZ
1956 Chevrolet Nomad
Paul Newman Chassis w/c4 suspension
2004 LS6, 4L65E, DBW, 3.54 gears
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