I have a suggestion. You might want to check your vacuum hose, and vacuum switch. My 4WD was inoperable. If you don't use your 4wd enough you can get dry rought on the hose. That may need to be placed, or check your vacuum switch which is located on the driver side in the transfer case. Might need relplaced, or take it off, clean it reteflon it, and tighten in back down. As for the clunking Might want to check it out at a Transmission shop.
my Chevy blazer power seat on my 1996 Chevy blazer isn't working
It sounds like a universal joint to me, it's an easy repair and cheap too.
If the overhead temperature module on a 1998 Chevy Blazer 4x4 stops working and the fuses are good, check to make sure the temperature gauge itself is not damaged. This is located in the front bumper of the vehicle closest to the front passenger tire.
check ground first
replace the spark plug wires
Either the arm on the actuator broke off (common problem) or the actuator itself burned out (which happens over time).
one of the lights is not working
you have an AC leak
you may have a vacuum leak somewhere.
what you working on? If it's a s-blazer i think i have the answer.
Could be a blown fuse.