Ive got a 85 4x4 full size k5 long story but ill make short......my truck has custom headers and i cant put the front drive shaft in but i want to test the transfer case I was told the transfer case was in order... when I engage the ...4H...the indicator light comes on and i can see the knuckle spinning when someone else was driving it forwards and backwards and i was on the ground looking under the truck.....however i cant seem to put the shifter in the ...4L...position does that mean it doesnt work? or partially works ? or am I stupid? lol

is there better ways to test the transfer case?

Are you in either park or neutral when you try. that is what you have to do.

yes ive tried in neutral and park...itll go into high just not low

sometimes when you are in park and try to change the vehicle will roll forward just a little and put the transfer case in a bind try rocking the blazer back and forth while you try shifting it into 4low. Also if it hasn't been in 4 wheel for a while you might want to change fluid and add some seafoam.

this might seem stupid but, did you pull the stick to the right a little and then down. Somtimes there REALLY stiff pull hard, I've had to shift some of the old ones with my feet.

yes i have been pulling to side and down, i havent tried rocking the truck though....I ve pulled hard as hell