2000 Chevrolet Blazer Q&A
2000 Chevrolet Blazer Question: my 2000 blazer takes a while to shift into four wheel drive.
7301639 is the NAPA part # for the transfer case vacuum switch. Buy one and install it on top of the transfer case. That will take care of this! It is a vacuum actuated front differential or axle, and this switch tells it what to do. That noise you hear is the front diff/axle trying to engage or disengage but can't due to this switch which it is sticking internally but will finally free up and complete the shift seqence. Replace this switch! Or have it done. - pushrod