You will have to remove the transmission. That is not a job for a novice. You need to take it to a repair shop and let them diagnosis and repair it.
On a 2004 Chevrolet Silverado in regards to a relay for the torque converter. After very intense research I cannot find anything that says it has a relay. I have never heard of any vehicle having a torque converter relay.
It is between the transmission and the engine, You must either remove the engine are the transmission to get to it.
You have to remove the transmission to replace the torque converter.You have to remove the transmission to replace the torque converter.
It is between the front of the transmission and the back of the engine block. It slides over a shaft and into the pump on the front of the transmission. Before you remove the transmission to service the torque converter you must remove the 3 bolts that hold the converter to the FLY-WHEEL.
The 2010 Chevrolet Silverado-3500HD's engine produces 373 ft-lbs. @ 4400 rpm.
The 2003 Chevrolet Silverado-2500HD's engine produces 360 ft-lbs. @ 4000 rpm.
The 2012 Chevrolet Silverado-2500HD's engine produces 380 ft-lbs. @ 4200 rpm.
The 2002 Chevrolet Silverado-2500HD's engine produces 360 ft-lbs. @ 4000 rpm.
The 2008 Chevrolet Silverado-3500HD's engine produces 373 ft-lbs. @ 4400 rpm.
The 2013 Chevrolet Silverado-3500HD's engine produces 380 ft-lbs. @ 4200 rpm.
The 2005 Chevrolet Silverado-2500HD's engine produces 360 ft-lbs. @ 4000 rpm.
The 2014 Chevrolet Silverado-2500HD's engine produces 380 ft-lbs. @ 4200 rpm.