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06-30-2008, 08:24 AM | #1 |
Registered User
Join Date: Mar 2007
Location: Cameron Ontario
Posts: 2
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transfercase clunking np203
Hey guys I had my 78 chevy out today with the np203 part-time kit. I noticed when in park I could here a clunking noise coming from the transfercase. I put the truck in 4 wheel drive and put it reverse and it didn't really want to move. I had to give it some good throttle to move.
Do you guys think my chain is toast? I put it in 2 wheel drive and I could still here the clunking but it would move in reverse no problem. Is it still safe to drive in 2 wheel or should I just park it for now? Is it possible to change the chain with transfercase still in the truck? Thanks guys Matt |
06-30-2008, 08:30 PM | #2 | |
just can't cover up my redneck
Join Date: May 2004
Location: Columbus OH
Posts: 11,414
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Re: transfercase clunking np203
Quote:
With the conversion kit, the chain doesn't turn, or carry any load. Most of the NP203 failures that I have seen were related to the "ring" gear that mounts to the central "spider" shaft. It is a fairly thin stamped piece that won't take much abuse. There is also a torrington bearing behind this center unit. If this fails, it changes the spacing/engagement of other parts. I wouldn't drive it..... I wouldn't even try to change the chain with the case still in the truck, but I wouldn't bet that it is your real problem. |
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07-01-2008, 01:47 PM | #3 |
Registered User
Join Date: Mar 2007
Location: Cameron Ontario
Posts: 2
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Re: transfercase clunking np203
Ok thanks, so if i am reading you right my best bet is to pull the case and rebuild it? Can I do this my self? I have a factory manual and is there a good book or web site that explains how to do this?
My part-time kit has been in for quite a while. I bought the case use 7 or 8 years ago and the kit was already in it. Matt |
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