My trailblazer works fine both forward and backwards! Yours however sounds like you blew the reverse band in the transmission and need a new tranny. Or your against something that is holding you from behind.
Weight of the vehicle
No
I had this problem in my 2007. the forward sprag was broken. i still had 1st, 2nd 3rd and reverse but no drive.
don t drive it
To put a Chevy Trailblazer into four wheel driver, locate the four wheel drive component below the instrument panel. While the car is in drive, move the knob into the desired four-wheel drive position.
car will jerk forward and then go in reverse
truck will only go forward not in reverse does this mean the transmission is gone
try driving it in reverse for a bit before you go forward.....rosdale joe
Problem with the 4 wheel drive
25 miles...but i wouldn't push it
Don't drive as much bum rides from friends car pool and ask for money when you drive
does it shift into reverse and wont drive? if so its your tranny it needs to be replaced