I have a 02 blazer LT 4x4 and I will say that I did do a little off roading but nothing serious like beating the crap out of it but now 2 days after it sat then drove it to work the next day then sat again overnight it just doesn’t drop down a gear when I really floor it so I’m wondering what the issue could be. It also just doesn’t want to go over 3500-4000 rpms.

 

Do you have a check engine light on? If it is shifting through all gears could be a sensor failure. But these normally will set codes.

 

there is a check engine light one but it’s been on even before this issue

 

Doesn’t mean there aren’t transmission codes in there too. Get it scanned with s scanner for OEM software not a code reader from Autozone. Let us know what you find out.