Some are standard and some are metric. Lug nuts are standard and most others are metric.
Does it have an automatic or standard transmission? That is the first question..
Is this a standard transmission, or an automatic? automatic
Need to know if it is a truck or car and if it is a standard or automatic transmission.
DEXTRON AUTO TRANS FLUID
I believe it is a FTX500
Don't use a wrench, use a socket. It will be metric, so just try your metric sockets until you find the one that fits.
When replacing brake pads a diagram may be needed. Diagrams to remove brake pads can be found in Chevy forums and in the specified auto books found in auto stores.