It should. They both had the same manual and automatic options for those years - NV3500 (manual) and 4L60E (auto) for the S10, Blazer, Trailblazer, and 1500; NV4500 (manual) and 4L80E (automatic) for the 2500 and 3500. Note that swapping out a 4L80E in place of a 4L60E is NOT a simple "plug and play" swap.
Yes
The Chevy Colorado came out in 2004
Truck Universe - 2004 Paint Shop Chevy was released on: USA: 29 June 2013
Where you get your dipstik from
Yes it will
Yes it will.
Pimp My Ride - 2004 Neil's Chevy 'Luv' Truck 1-9 was released on: USA: 2 May 2004
try haynes.com.
6 3/4" speakers front and rear in a four door 2004 Chevy Colorado.
Behind the dash on the passenger side.
If you have to ask how to bleed brakes, do not do it yourself.
YES, Chevrolet did produce a truck in 2004 called a silverado.