More Tranny/4wd Issues, Please Help Diagnose?

[Erik1972]

So last friday I had my 05 Sliverado in the dealership for a Service 4WD light on and my buttons on the dash not lite up. They found about 3-4 codes and did alot of work to the tranny and transfer case. They put a new actuator encoder motor, replaced the 3/4 clutches and overhauled the tranny flushed the tranny and new filter.

 

That was on friday. Sunday I am driving down a country road about 53 mph on an incline and I noticed my truck start to shake some and steering wheel definetly was shaking like something was slipping real bad. I made it up over the incline and eveything was back to normal and it really hasn't happened since.

 

I know they won't get it to do it again but what should I tell them it could be?? It definetly was some kind of slipping going on but I am not sure if it was tranny or front end of somekind.

 

Thanks, Erik