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Discussion Starter #1
Hey guys,

I have been searching on here but haven't found anyone with this problem yet. I have a 2015 Viking VI with a 2" lift , 28" tires, and JBS Hot Rod Sheave kit with slugs and spring. It's been lifted/sheaved for about 2 years now with no issues, but within the last year it started making this awful metallic clinking sound when reversing. It seems to do it worse if I am really loading drivetrain up backing uphill or while steering. It makes no odd sounds in forward gears, I cannot find anything loose, CV's are good, but if I put the parking brake on slightly it seems to at least quiet it down. I had my wife reverse it with the bed up so I could try to see any sort of abnormal looking movement, but it all looks perfectly fine. It sounds like it is coming from the diff, but if that was jacked up it seems like it would do it in forward as well. Any ideas? Hopefully you can hear it in the video.

It only does this in reverse, and only as I let off the gas. I am guessing it is some sort of backlash winding up/letting loose, but it seems really excessive.


 

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You might want to check if the parking brake disk is loose.

Sent from the bottom of a whiskey bottle
 

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Yeah it's a strange one, did you mean that you have jacked it up to try and locate the source and when jacked it does it going forwards as well? The middle gears can fail but it sounds a bit tinny for that, you could drain the diff and see if there's any metal in the oil, or pull the fill plug and try and look in the hole turning the back wheel and see if any teeth are damaged? Does it do it after the same number of wheel revolutions each time, it actually sounded like it did it twice at the end of your video, the 2nd one was a fair bit quieter?
 

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Discussion Starter #4 (Edited)
I checked the parking brake disc and it is still nice and tight. I also torqued the mounting bolts on the diff a little more since the Rhino guys had similar troubles and that supposedly fixed it. No change.

cactus: I had it jacked up last week while servicing the rear brakes. I spun the wheels in forward and reverse by hand and they moved freely with no problems. It seems like there has to be some kind of load on the rear end for it to make this sound, but it only does it in reverse. I believe you are right and it did make the sound twice at the end of the video. I also noticed at :16 there is a piece of dirt that flies off the diff as it clicks. It seems that the diff may be moving, or maybe something snapping inside of it? I will check it out again tonight.

Thanks for the suggestions! I will be checking the oil next to see if there is any debris.
 

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Discussion Starter #5
I finally got around to draining the rear diff. There is some fine grey material, not a whole lot though. No chunks or large pieces that I can find. Is that wear normal? If I remember right, I changed the fluid after the break in period but haven't touched it until now. It has 1270 miles currently. Thoughts?
 

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Probably fine

Sent from the bottom of a whiskey bottle
 

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Well I had the wife reverse it again today while I held a fiberglass rod against the diff housing to feel for any clicks. The sound is definitely coming from the diff. I guess I will have to pull and crack it open to see what the **** is going on in there. Anybody got a link to a service manual or a write-up for pulling one of these out? It looks pretty straight forward, but a guide would still make it a bit easier.
 

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I finally got around to draining the rear diff. There is some fine grey material, not a whole lot though. No chunks or large pieces that I can find. Is that wear normal?

Yes that's normal.

Even though the rear diff is only a right angle drive pulling it apart and putting it back together is a bit tricky. You need backlash adjustment and the tools to do it, as well as pinion gear pre-loading etc. If you pm me your email I can send you a manual. And are you absolutely sure that the noise isn't transferring to the diff from somewhere else?

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Discussion Starter #9
Yes that's normal.

Even though the rear diff is only a right angle drive pulling it apart and putting it back together is a bit tricky. You need backlash adjustment and the tools to do it, as well as pinion gear pre-loading etc. If you pm me your email I can send you a manual. And are you absolutely sure that the noise isn't transferring to the diff from somewhere else?

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PM sent. I am 99% sure its the diff at this point, but I will double check to verify that it isn't coming from somewhere further up the driveline. This is starting to sound like something I'd rather let the dealer mess with. Thanks for the assistance guys, I'll let you know what I come across.
 

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PM sent. I am 99% sure its the diff at this point, but I will double check to verify that it isn't coming from somewhere further up the driveline. This is starting to sound like something I'd rather let the dealer mess with. Thanks for the assistance guys, I'll let you know what I come across.

Maybe get the dealer to diagnose the noise at least, even if you do the rebuild yourself?
 
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