2WD to 4Hi

[northsnoma]

Replaced my transfercase switch and now I cannot get to 4wd. Had a big snow storm last night and needed to use it, the roads were terrible. First time I pushed the 4HI button I was coasting out of my drive under the alloted speed and it made sort of a "non"-metalic grinding noise. Light successfully went to 4HI but I could barely get up the minimal slope, definently not 4WD. Drove it in 4WD for 150 yards to give it time to switch but never did (light still displaying 4wd). Slowed and switched to 2 HI, gave it time to switch, then back to 4wd with same results. Only made the "grinding" noise the first 2 attempted true switches from 2 to 4wd then never again. Pulled on to the main road and barely made it up wimpy hill, fishtailing with any touch of the gas (with other motorists around ) . Got to the top and pulled over to crawl under the car to check the switch, everything OK. Air'd down the tires to 25 and proceeded to almost die twice and be half an hour late to work with my boss calling me as I pull in the lot

[rlrnr53]

Sounds like the vacuum hoses are on wrong. try taking them off and turning the connector around. It's easy to get them on wrong if you're not careful.

[northsnoma]

Well I know for fact that I aligned it up with the tab (paint marker'd it) so I cant imagine that would be the problem. Perhaps my vacuum lines are on their last legs in this weather

[F9K9]

You could well have a vacuum leak but, the light shouldn't show solid if, you were not in 4 high.