my 2011 slverado has got a vibration at 45 mph 46 is smooth 44 is smooth could it be the tork converter ps i have not had trasnmission fluied changed i did have local mechanic say the fluied looks like new it has 106k miles also the ac wont come on now the weather is cold when it gets warmer the temp on dash say 54 when it is 71 out side any info on this i have kept it up best i can oil change every 10kl miles uses full synthec oil ac was worked on this year no problems just would not cycle then i hit the controler real hard and now it works fine when its hot now when its cold at night and warm in day a/c will not come on meaning compressor
The vibration probably mean you need a alignment or your tires balanced or both. If you hit the AC controller and it started working you likely need a new controller.
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