Look under the front bumper. There should be a metal panel with a small door which says "oil filter access". The Blazers tended to use a remote oil filter.
2 wheel drive
rear wheel drive or 4x4 capable
It is rear wheel drive, until you shift it into 4 wheel drive.
A 1996 Chevy Blazer Does have a transfer case IF it is equipped with 4 wheel drive
Alot depends two wheel drive is on rear of engine where four wheel drive is on a remote oil cooler under access door below radiator
It is behind the radio
2 wheel drive, yes. 4 wheel drive, no.
I have an 1999 Chevrolet Blazer with 4 wheel drive, and it has about a 12-gallon tank.
We get 21-23 mpg highway and 17- 18 mixed on our 2000 Chevy Blazer 4.3, 4X4.
under the battery plate
It does not matter what gear it is in.
You didn't mention what years they are but, there is a different filter for the 2 wheel drive and the 4 wheel drive.