First we need reprogramacion the ECU of the Car. Together with Other sensores of the Car. But also need check, throug a escáner.
If You can explain me in spanish its better tha english But i will try to understand You.
I will be on line.
IAm juan Ramon
Check the following things
1- reprogramar gratis ECU of Hummer.
2- check TPS sensor
3- check your speed sensor and the wire going to it.
4- check the wirinng of gear new box too. Together with the relay se And fuse of the Hummer.
5- relalice a scanner to the ECU or computer of the Hummer.
I hope that You can understand me And explain all about that But if You can more help or more information i wil tray to help You And understand more about your question. Also i am on line .
Thanks very much And good a have night or day
Greetings from México.
Aunque el pago es demasiado, demasiado bajo , le comprendo. If You need more information about that, Tell me. Doesnt mater the pay.