Clicking noise i have a ticking noise in my 1997 4 door 4wd blazer when its in 2wd up to around 40 mph it stop or is not noticed. when 4wd is engaged it doesnt seem to be clicking any more. 4wd works fine, my dad did say he drove it home from work one day accidently in 4 high im sure that might have something to do with it but i dont know if it was there before the because my dad was driving it at the time. ive always worked on european cars so i know nothing about trucks and 4wd HELP!!!

https://www.justanswer.com/chevy/3pa5y-change-starter-1997-chevy-blazer-4wd-4door.html

Check the vacuum switch under the hood in the center of the firewall...follow vac diag

grease ur differential ur rear end get underneath find all ur grease zerts and ask a shop how to grease ur rear end

make sure that your vehicle has a "on the go" 4wd operation
if not , you will have to all but stopped to get around the gear slashing
if you have "on the go " engagement , then is a problem in the synchro rings of the transfer case
take it to an accredited transmission specialist for a proper diagnosis

1. • 1 Start your Dodge truck's engine.
     
   • 2 Turn the electronic transfer case from "2WD" to "4WD Lock" to engage the high range 4WD, if the dodge truck is equipped with an electronic transfer case; otherwise, shift the transfer case lever from "2H" to "4H." The electronic transfer case is located on the instrument panel and is marked with "2WD," "4WD Lock" and 4WD Low." The lever-equipped transfer case is located to the right of your leg and is marked with "2H," "4H" and "4L."
     
   • 3 Shift the transmission into "Neutral" while the vehicle is either stopped or rolling at 2 to 3 mph to begin engaging in the low range 4WD. Turn the electronic transfer case to "4WD Low," if the Dodge truck is equipped with an electronic transfer case; otherwise, shift the transfer case lever from "2H" or "4H" to "4L."
     
   Tips & Warnings
   • Indicator lights will come on and alert you that your vehicle is in either the high or low range of 4WD.
     
   • Do not engage in the low range of 4WD drive if the transmission is in gear; you must shift to "Neutral" first.
     
   • Many Dodge trucks allow you to shift from 2-wheel drive to the high range of 4WD at up to 55 mph--consult your truck's manual to ensure that this is possible. Do not exceed 55 mph while engaged in the high range of 4WD. Do not exceed 25 mph while engaged in the low range of 4WD.
     
   • Do not engage in 4WD unless you are on slipper or rocky roads.
     

It is because of the hub assembly on the front axle will be much different on a 4wd. It will require a different offset and backspacing than on a 2wd.

try putting in nuetral and then shift into high gear . if still does not work sounds like the 4x4 acctuator is bad

It is somewhat Normal Depending on how Loud the Clunking is. This is a Common Complaint on the Chevy 4x4's. I have verified this through the Dealerships here in Oklahoma and they all say the Same thing But, I am with you, They should go into 4x4 without that Clunk for as much as we pay for them.

Check the ft diff actuater. Sounds like the ft diff isn't complelely disengaging when in 2 wheel drive. Also I'm not sure but I think that the fr driveshaft should not be turning when in 2 wd. If it is turning then you could have a problem with the transfercase.

1. I would suggest that you engage your 4WD while you are in full stop and/or safe range of 5mph, however as claimed by the local dealers your vehicle is capable of engaging even while driving. Engage your 4WD while moving only when necessity requires.
2. That clicking noise while turning extreme right or left would be the birfield of your axle and would only mean your front hub is still engage even though you have disengaged transfer case.
Have your front hubs cleaned of old lubricants or grease due to non usage. dont use grease as lubricants, use thick oil such as gear oil or silicone oil. and use your 4WD every now and then.

Do this first then check if you still feel somtehing is loose on your suspension and others.