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Help diagnose what I did wrong here....

AZShooter

1/2 ton status
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Jul 26, 2012
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Location
Tempe, Arizona
So I took the K5 out for a great hunting season....

Not so great as far as game this year, but did bag some dove. :) Elk and Deer were a wash, but mainly I was able to test out the new equipment on the Blazer.

That is:

3.73 gears
Lock-Rite Lunchbox-Style locker on front Corporate 10 bolt.
NP208 Transfer Case (Seemingly newer rebuild)
Manual Warn Premium Hubs
Rebuilt 700 R4
New 33" KM2's

As of now, the truck is at the shop. The NP208 shredded its chain, pouring fluid everywhere. The U-Joints in front need replacing...seemingly pushed to the point of almost breaking. Also, the Lock-Rite locker is completely shredded.

What happened???? Not sure. I never heard any grinding/clicking from the front end. Also, during elk season the truck ran very well. When we took it out for deer she didn't want to go into 4H, which was odd, but a warning nonetheless. Finally, I tried to take her out on a drive the other day when I noticed the semi-regular clanking noise which prompted me to get her on a rack and have a look. That is when we discovered the blown T-Case.

Since the case looked liked it had been gone over when I first got the K5, I left it alone. I can only guess whoever rebuilt it or tried to fix it did a bad job. This alone, however, does not explain how the front end became shredded...

It would be a lot cheaper for me to rebuild the NP208, bolt on some new U-Joints, throw in another Lock-Rite and try it all again....but I can't seem to put together how this all happened?

Could it be the truck is too heavy for my setup w/ too much traction on the KM2's for a locker up front? Do you think I am right that the T-Case was dying or repaired poorly to begin with?

I know I can find a used NP205 somewhere, rebuild it, get the adapter and replace the drive shafts but that will be pretty expensive.

Any thoughts? I'm kinda at a loss here.:dunno: I don't want to rebuild everything to save a buck as mentioned above just to have it all happen again after minimal usage. :confused:

Thanks!
 
I blew up 2 of 3 lockrights last year. Both were warranted. Not sure what yours looks like? But both of mine rounded the teeth off/broke the spring pockets apart. It may be worth getting into conact with whoever you got the lockright from and see what they say? The one in my D60 only had 2 weekends of moderate mild wheeling on it. Which led me to believe I got a faulty one.

I have since replaced the lock rights with other traction devices though.

If I remember right Chevy305 had some lockright problems as well last year and they were warranted as well I think.
 
Just rebuild/replace the 208. For what you do it is fine. I ran my 208 with 35/15.5 tsl's crawling and it was fine. I'm sure yours was just ready for a rebuild.

Are the caps still in place on the joints? I used to lose the snap rings all the time and if I didn't catch it quick enough it would eventually fling the cap out and trash the joint.
 
CORRECTION!!

It was a SPARTAN lunch-box style locker, not a Lock-Rite. I remember now I wanted the Aussie, but Aussie did not make one for the GM Corporate 10 Bolt so I settled for the Spartan b/c it seemed to have the same design....not sure if this changes anything.

Also......are we saying it was just a simultaneous malfunction between a bad locker and a pooped t-case?? Could the failing t-case lead to shredding a lunch-box??...or vise versa??
 
If the case was getting lose and something locked up in the front end because of the locker failure I could see it making the chain start jumping teeth which would make things go south fast.
I'd quit worrying about what caused what and just fix it. Rebuild the 208 and throw some new u-joints in.
Do you have some type of locker in the rear? If not I'd buy a locker for the rear and put spiders back in the front and leave it open. You'll go just about wherever you want to go on 33's and it'll make life much easier on the front end.
 
Ha! Yeah, you're probably right. I'm going to just put her back together again and see what happens.

To answer your question, I have a Yukon LSD in the rear 10 Bolt.
 
Yukon does have a pretty decent warranty on their lockers, you may check in to that. For what you're using it for, what you have should be reliable.
 
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