1990 astro front all wheel drive not working no noise back is fine Help?

Answer 1

there are only two items to check here; transfer case, and the front differential. both expensive. To test, lift all four corners on jackstands, put vehicle into neutral, spin front tires and listen; ANY noises from front indicate bad front diff ($250 from boneyard). Next, to check transfer case;start engine/put into gear. An AWD unit 'floats' power to both front and back, like a diff. And are notorious for failure in two ways- one, they seize sending 100% to both axles, and will blow entire drivetrain. two is your symptoms, no power output to (front) axle. There are clutches inside...like a mini-bike!!! LOL AWD transfer cases are $$$$ ($800 & up At junkyards-$1400 new). I solved this problem by converting to 4X4. I swapped out parts from an old blazer s-10..(transfer case-4x4 shifter unit-front differential-front driveshaft- vacum parts/pieces. and it all BOLTED TOGETHER. driveshaft 's-10' had to be 4.5" longer.. had to 'modify' a brace under floorboard with hammer/torch for new transfer case to fit. that was 60,000 miles ago, without so much as a burp. good luck.

there are only two items to check here; transfer case, and the front differential. both expensive. To test, lift all four corners on jackstands, put vehicle into neutral, spin front tires and listen; ANY noises from front indicate bad front diff ($250 from boneyard). Next, to check transfer case;start engine/put into gear. An AWD unit 'floats' power to both front and back, like a diff. And are notorious for failure in two ways- one, they seize sending 100% to both axles, and will blow entire drivetrain. two is your symptoms, no power output to (front) axle. There are clutches inside...like a mini-bike!!! LOL AWD transfer cases are $$$$ ($800 & up At junkyards-$1400 new). I solved this problem by converting to 4X4. I swapped out parts from an old blazer s-10..(transfer case-4x4 shifter unit-front differential-front driveshaft- vacum parts/pieces. and it all BOLTED TOGETHER. driveshaft 's-10' had to be 4.5" longer.. had to 'modify' a brace under floorboard with hammer/torch for new transfer case to fit. that was 60,000 miles ago, without so much as a burp. good luck.