Quote:
Originally Posted by Jetboy
I'm a bit confused on what it means that the thread was collapsing. The threaded adjustment nut (the big ring you use a spanner wrench to tighten) was collapsing internally or the threads cut into the cast steel housing were failing? I've built a few of these diffs. I haven't seen it myself, but it seems a bit unusual. The bearing caps should hold the outer carrier bearing race in place once the preload is set even without the threaded adjuster nut. Ideally the bearing caps slightly compress the adjuster nut and mostly clamp down on the bearing race to hold it all tight.
But the bearings do wear. And if they were not fully seated when installed or they had more than normal wear I could see a loose ring carrier. Often 100K+ mile Toyota diffs will have close to zero preload. The best advice I know of from a very experienced pro builder is to basically tighten the toyota carrier bearings as tight as possible including any used ones you pull out. Just crank them down really tight to maybe 100 ft lbs or more on the adjuster spanner wrench. More than you can do with one of those scissor looking spanners.
Glad you got it sorted out! Hope it stays put from now on.
Also FWIW - at least as recently as maybe 3 years ago it was the case that there is only one source for 8.2 gears, so it doesn't matter who's logo was on the box. They're all from Circle K (Samyong). Nitro just charges more for the same thing as Yukon or Precision or anyone else.
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Thanks, I’ve rebuilt these diffs too, albeit without the locker, and I was equally puzzled. The shop said there’s too much load on that side so when they removed the threaded ring there was very little thread left on the carrier. My guess is the clip wore out and developed play? Let’s see if the welds help keep it in place. The shop owner said they’re considering calling every 4runner they did the gears for to also put a few welds to prevent this issue as they’ve seen it before too. And the shop said the same thing about Nitro and Yukon - made in the same factory but Yukon has good customer service while Nitro never honored their warranty.