blazer 4wd not working.

[broken_line]

i have a 1987 chevy blazer and the transfer case is shifting into 4wd but it doesnt not go into 4wd. what could be happening? could there be something wrong with the front diff?

[ANYFISH2]

Right around that time they went to a vaccum system. You may just have a vaccum hose that is broke or slipped off. I had the same problem with my '88'.

[Smokey]

I had an 1985 S10 Blazer that the front axle would not lock in. Turned out to be a plastic vacuum valve/switch thing that broke. It was located on the transfer case, when you shifted into 4 wheel, this thing was supposed to port vacuum through a line to the actuator which was located by the passenger side front wheel, a cable from there would pull and engage the front axle.

Could be the valve/switch, could be the line, could be the actuator (bellows).

Or something else entirely.

[Jeremy airjer W]

Check the ones under the battery tray first. If it is a vacuum system its not uncommon for battery acid to leak down onto them and ruin them. By the time it is fixed you will have become intimately familiar with the under side of your blazer!

[Phred52]

I like the way you stated that airjer. Phred52

[broken_line]

there is a cable running into the front differential. also the light doesnt show its in 4wd. thanks for the help i will check for vacuum lines. is there any way to jurry rig it in? just need it to get my fish house out.

[broken_line]

never mind i got it! the vaccum hose came off the bellow! works like a charm now! thanks alot!!!!!!!!