Well I saw a small puddle under my truck this morning while it was parked nose up in the driveway for the past 2 day, crawled under and saw the output seal was partially hanging out and letting fluid drip out. Everything is tight under except I have about a 1/4 inch or less play on the center bearing. I tapped the seal back in temporarily until I can get one. Any precautions I should take doing the seal and does it sound like the center bearing is toast?

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Bump

 

Do you mean the one on the back of the transfer case?

 

2wd so tail shaft on the trans. Where #1 yoke and u joint are

 

There is a bushing in there on the NV4500 that the mainshaft rides on to help support it. The NV5600 should be similar. I don't know what the specs are for the NV5600, but it sounds like too much play. Usually when a seal goes it means you need to replace a bearing or two. I've been told you need special tools to rebuild the NV5600. If you put a new seal in you may be good for a while depending on how you use the truck. That way you can save up for the rebuild.

Putting the seal in is easy. If you have the right tool you can hammer it straight in, but if not just tap around it with a hammer till it is seated. Be careful not to damage the rubber and park the truck facing downhill so no more fluid drains when you replace it.

 

I shook the drive line and yokes and the only spot I have play is at the center bearing. Its the original seal so I didn't think it'd be weird for it to go out around 180,000+ miles. Its still holding strong since I put it back in so Idk. I though maybe just vibration from my tires could have done something. I hate the big chunky mudclaws that came on the truck when I bought it and I need to find some different tires. These suckers hum all the time and make the ride chunky and they vibrate like crazy and they are balanced fine just the tire

 

My bad. I thought you meant the bearing in the transmission. You mean the carrier bearing in the driveshaft. Those things are a pain. I read a couple of threads where people used a spacer to keep them lined up and they lasted much longer. They are a common problem with the 2wd trucks. The shaking from the carrier bearing probably caused your seal to come loose. I wouldn't replace it until you replace the carrier bearing because it will likely happen again. Search around before you do anything as I've never replaced one (now that I say that I bet it will be the next thing to go). You shouldn't have any play in the carrier bearing and if it goes you will be stuck on the side of the road.

 

If they are anything like doing them on over the road trucks then shouldn't be a probing just smaller parts.

 

Oops my bad. The seal should be pretty simple to replace though

 

This may help you...

 

Figured since I ended up having to do the seal sooner than I thought id share some insight. The seal was completely junk it fell completely out and was hanging on the yoke, coated the whole under side of the truck in oil and lost about a quart and a half of it. Started tear down yesterday by unbolting the straps on the input yoke at the rear end, bolts are 5/16ths, sprayed wd-40 to loosen up the rust (wouldn't budge even with a Bfh.) Then unbolted the center bearing, two bolts and two studs both 15mm. I turned the center bearing up and out of the way so I could pull the shaft out. Budged loose the rear ujoint at the rear end and taped up the caps so they wouldn't fall off. Then pull the whole drive line rearward until the slip yoke comes off the output shaft. Clean up the surface real good and make sure your surface where the seal sits has no lips or grooves. Seal number is national # 4741 at advance auto, which btw doesn't list anything for the nv5600 so I spent an hour down there with the guy using a micrometer to find the catalog lists the nv4500 as the trans but the seals are the same. Took a 2 and 3/4 socket and drove it in to the tail end until the lips on the seal were even with the housing, then reassembled with some locktite on the bolts.

All in all very easy project but the seal was a pain to find because of the part stores listings. Hoping this will help someone out since I didn't find any good info on it especially with finding a seal.