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Crush tube issues on diff


chees-

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was never driven on while seized. this has all happened out of car.

I took it to a diff/automatic shop cause it was leaking out round the nut. he thought the nut was really loose hence causing the leak. so he cranked it down which caused the bearings to seize up on him and him to them assume there was no crush tube. perhaps he just overtorqued it?

i have the mark of where to tighten it to for the original "loose" setting but that still has the issue of why the nut was leaking. and now the crush tube has been crushed that extra little bit?

 

its from Kurts aa63 celica but north shore toyota thought that was a T series, so i'd a assume a ga61 celica or ma61 supra. would be very helpful if you can thanks

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If you haven't driven on it then hopefully the pinion bearing will be OK, providing he didn't tighten it to the point of damaging the bearing cage. (which does take a fair bit of effort - but "cranking it down" sounds very tight to me)

 

In my opinion, crush tubes are one way. Once you go too far, you can't go back - not without compromising durability.  

Even if you can "straighten" the crush and reuse it, the metal will have a memory and won't take much loading to cause it to crush a little more and the pinion will be loose again.

 
So I would personally order a new crush washer - they are cheap as fuck (maybe $20-25) and set it up according to spec and follow a decent guide for setting up diff preload.
 
Also replace the pinion seal if you think it may have been damaged in the process of pulling the crush washer in and out a few times.
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yea i inspected the bearings and everything looks A ok, new pinion seal is on my desk as we speak.

i was considering getting a solid spacer made up vs a crush tube. new crush tube from toyota was $50, don't have a torque wrench etc so would be easier for me atleast but quite a bit of extra $$?

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How soon does a diff go clonkity clunk bang bang if you screw up the pre load?

When mine had a horrid amount of end float, AKA no preload.

My diff just got super crazy noisy.

Inspecting the gearsets while apart and they seemed fine, still are 20,000kms later or whatever.

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A rattle gun and take your time. Do it in little bursts. It actually takes a fare bit to start collapsing the spacer. But once it does start then you need to ease up. I've used a in/lb torque wrench to set pinion bearing preload but after you have done a couple - you can do it by feel. I have found the factory spec for setting pinion bearing preload on a G Series diff to be a little on the light side if anything. I go for a bit more than factory spec. Ya don't get any whine or anything ... it might wear the bearing a minute bit more or something. But have you ever turned a properly set up diff from Strange or Moser or anyone? Even got your paws on one done by an experienced technician in a specialist differential shop. They have some serious drag on them. Its the same deal with 9 Inches too ... rattle gun and take your time. 

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