Well today i finaly fixed my valve tap for good...So i figure id hit the mudd since i havent in about a week..So i go nuttin special just a muddy field..But I noticed when I was leaving my friends house before I went to the fiel when I would get on the gas or off it a couple times a heard a weird clunk which sounds like is rite under or in the front....and after mudding I heard a couple more times..Me and my friend sprayed penitraiting oil in the front Ball joints and u-joints but no help...Any suggestions?

 

ok new update..well this morning on the way to school I was on this busy road with stop lights..Well when I went to stop I would cost fro ma distance..well the first red i was coastin to a stop when I got about 5 mph I heard a big cLANK and the front end banged a lil...So I get to the next Red light same exact thing..but this time it was 2 BIG BANGS and the front just popped...Well the light turned green and so far I havent felt nothing since then....Do you have any idea what it could of been??Do you think the 4wd didnt fully disengage from yesterday??

 

This sounds weird....but it could be missing washers on your hood hinges. Pop your hood and grab the side of it and pull (parallel to the hood) back and forth relativly hard...You might here a small clank...if you want to test it shove a rag or something right in front of the hinges to put upward pressure on them...it should get rid of the clank...if you dont get what i mean with the rag thing...then lemme know...ill get a pic

 

Just tried it..lol nope hood is real sturdy..the sound came from under the truck in the front..

 

I would jack the front end up under the control arms just enough to get it off the ground and get fingers under the front tire. Have friend push/pull on the tire to see if you get any play out of the ball joints especially the lowers, if so then you will have to replace them. Also at the same time check to see if they have been replaced before by looking for bolts instead of rivots holding the ball joints onto the control arm. Lower ball joints on the blazer if not greased on a regular schedule have a tendency to fail (as does anything else).

 

I had a problem like this but it didn't sound quite as extreme. Check your front diff mounts. If they break or work loose your front driveshaft will shift over and hit against your tranny.

 

check the tranny/xfer case mount. Mine had a broken bolt and broken rubber portion of the mount. See if you broke off one or both of the studs holding the mount to the cross member.

 

figured out it was bad u joints on the rear drive shaft now i totaled my pinion flange... ;(..one word of advice dont drive on bad u-joints