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Old 08-06-2002, 10:50 AM
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Post 76 chevy transfer case

i have a 76 chevy step side 350 4x4. the transfer case would make a loud grinding noise as if ice was moving around in a cooler... and now it doesnt do the noise but around a turn or heavy acceleration there is alot of vibration. please help. <img src="graemlins/spank.gif" border="0" alt="[spank]" />
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Old 08-06-2002, 06:11 PM
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that should have an np 205. good solid transfercase. all gears, no sissy chain crap here. sounds like you lost a bearing. i haven't rebuilt very many of these, but they are fairly easy to do. i think all the bearings are accessable from the out side but there are bunch of needles like a u-joint inside. roll under and start shakin stuff around, (check for looseness) see if you get excessive play at either out put. take both drive shafts out, then run it see if it makes a bunch of noise. could be a u or axle joint gone bad.
just some ideas before you start yanking a transfer case out to find a bad joint.
at least thats how it would happen for me.
good luck.
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Old 08-06-2002, 07:09 PM
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no... i think its the 203 with all the chain crap... is that much different...
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Old 08-06-2002, 07:51 PM
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if you have the case with the chain and its streched you will get a chattering or snapping noise when you take turns if you have a fulltime case it will do it all the time if its a parttime case it should only happen when engaged. i had this problem with my old 73 blazer about 12 years ago so my memory might be a little foggy but thats what my problem was hope i helped a good tranny shop should be able to diagnose it for you.
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Old 08-07-2002, 01:09 PM
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yeah, the chain just isnt as solid as all gear driven.
not bad though.
helrazr3 has good advice. they should have a good idea of your problem from a test drive, that shouldn't cost you a dime.
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Old 12-15-2002, 10:54 AM
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I have a 1999 Chevy Silverado ~ 5300 V8, Auto Transmisson, 4x4. I noticed that I have a noise coming from under me or back by the tires. It sounds like I have a big tire problem, but I rotated the tires and nothing changed. I jacked up the back end and it doesn't sound the same out side standing by the truck, but it still seems there! Somebody said maybe a bearing. Everybody has there own opinion. I'm not sure what to do or what could be the cause or how much it will take to fix is my big question. The truck shifts find and runs good, but the noise. I also notice the noise when I use the 4wd, on dry, wet, or ice/snow. It has a loud hummmmm to it when i get to 25-50 then it goes away, but now this noise under me or in the back is there after I get above 12mph. Please Help someone.
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