well get out your tools and keep trying sizes until on works
Some are standard and some are metric. Lug nuts are standard and most others are metric.
Is this a standard transmission, or an automatic? automatic
Does it have an automatic or standard transmission? That is the first question..
Need to know if it is a truck or car and if it is a standard or automatic transmission.
15mm
3/8"
DEXTRON AUTO TRANS FLUID
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.
T40
5.7litres.
I believe it is a FTX500
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.