Transmission slipping

[Terris]

I am looking for help with my 2007 Gmc sierra 1500 Classic, the transmission had started slipping on me a few days ago, 1st gear works perfect then it gets high rpms and doesn't want to shift into 2nd I have to ease off the throttle with speed to slightly catch either 2nd or third, then even when I'm going 90 kms the rpm is at 3500.. There's slipping going on and it won't shift from 1st to 2nd.. Any Ideas what this could be ? Also my tranny fluid levels were good but the oil smelled burnt..

 

 

 

Thanks

[gmtech4]

there are very good tranny guys up in FSJ at the GM dealer ,,,,i know cuz i used to work there,,,,

 

if ya price out a replacement from gm ,order in advance ,make an appt and same day service ,,,,in and out with a 3 yr warranty ,,,no brainer ,,,,cooler gets flushed etc etc

[Carder09]

Beef it up as well. In case you plan on adding power later.