i got a 95 2 door blazerwith 202000 miles. everything has been done but the transfer case engine, and the body/chassis. when i put the truck in 4wd it'll starting putting out white smoke after a few minutes, then when i put it back in 2wd it stops after about 5 minutes. i have no clue whats wrong or how to fix it. PLEASE HELP!!!

 

how often do you use the 4wd

 

Replace the vacuum switch on the transfer case. It's sucking in tranny fluid in the 4WD position (my guess)

 

i don't use it that much, but when i do it scares me, that truck is my baby ya know?i don't know how it could be the vaccum switch, cause it comes out the tail pipe, which doesn't make sense to begin with. how would 4wd make the truck smoke like that? this has had me puzzled for almost a year

 

have you checked the fluid in the transfer case?

 

If you have fluid in the vacuum lines, you likely have two issues; 1- bad transfer case input seal on the front of the transfer case & 2- bad vacuum switch.

To check for a bad input seal on the t-case, pull the fill plug on the back of the t-case. If fluid pours out, then the input seal is bad and the t-case needs to be dropped.