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Old 02-20-2006, 03:06 PM
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Clunck Clunck Clunck!!!!

Hi All,

I'm getting an odd cluncking/shaking sound coming from my 79 Chevy K10. While I'm driving, it sounds as thought it is coming from the front drive shaft. When I get under there, it all seems tight. When i put it in neutral, there seems to be play in the front of the transfer case (NP203-full time 4x4 / TH350 Tranny). The same is in the rear, but not as bad. All the u-joints seem ok. When I hold the drive shaft and the slip yoke, there is also a bit of play...not sure if that is normal or not and it is on both the front and the rear.

I'm wondering if it is a bearing in the transfer case, and if it is, if thats easy to replace.

Thanks,
Steve

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Old 02-20-2006, 03:16 PM
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Even though the "U" joints seem tight, they may be bad or are seizing. I used to replace all my "U" joints in my 75 4x4 every 2 years....of course, I was plowing snow with it.
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Old 02-20-2006, 07:21 PM
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Did you check the axleshaft U-joint's yet?

If it's a full time you can just chock the wheels, and set the transfer case in neutral and turn the front driveshaft by hand to see if there is play in the shaft joint's.

Could it be the transfer case chain with excessive stretch, another neutral test, turn the front driveshaft and see how many degrees it turns before the rear driveshaft starts to move7 to 13 degrees is normal for a good chain, 22 is on the high side, anything more is replace ASAP.
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Old 02-20-2006, 09:05 PM
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I haven't replaced the front shaft u joints yet, only the front left drive axle shat joint. I'm going to replaced the front ones as well as the front right.

Never thought of the chain in the case. Is that something thats really difficult to do, and will Ihave to remove the case from the truck, or can I do it fairly easily with it in place?

Thanks for your help,
Steve
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Old 02-21-2006, 01:41 AM
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The chain in the case is best left to do if you remove the case from the truck, remember though, it weighs almost 300 pounds, there's a LOT of cast iron there.

I wouldn't say it's fairly easy even on a shop bench either, but it's not out of the range of difficulty for someone who is able to change a camshaft.

I would recommend getting the ATSG rebuild manual for it though, straight forward and has a lot of pictures and diagrams.
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Old 02-21-2006, 06:36 AM
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Thanks for all your help, I think I'm going to either get a rebuilt one from Autozone or have this one rebuilt...which ever is cheaper. THanks again.

Steve
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Old 02-21-2006, 08:56 PM
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Has any one ever converted a fulltime 4x4 to part time 4x4? If so, was this a very difficult thing to do, and will it solve the problem of turning the chain in my trasfer case when it is not in 4x4 until I can get the money to fix that? THis conversion is one that I had planned on making anyways.

Thanks,
Steve
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Old 02-22-2006, 07:48 PM
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bump bump bump bump
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