I recentley swapped out the auto trans on my 98 LT 4WD Auto Trans Blazer. Well I noticed recentley that my baclup lights no longer come on. All the fuses are ok, and I hooked all the lines back up on the trans, I made real sure to becasue I dont want to ever take that trans bakc out. Could it be the switch on the trans thats bad or what, trans came from ajunkyard with 67K miles.

 

I would swap over the park/neutral switch on the side of the transmission from the old trans.