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Skool Me On My Toyota Differential Assembly...

84Toyota4x4

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Ok, so not too long ago, I put new 5.29s and a spool in the rear of my truck. Funny part about this whole post is the fact that I did in fact do the work, however, I cant remember jack **** about how the damn things work enough to figure out what my problem might be. Keep in mind however, this diff is making no noise at all, and otherwise seems to work fine, it just has me worried since its my first diff rebuild.

Anyway, the problem is, with no driveline attached at the rear diff, I can rotate the input flange very freely quite a ways. More-so than I think I should be able to (feels like more than just the backlash). Also, as I rotate it, it moves in and out SLIGHTLY. If you wiggle the flange around, theres also some freeplay. I dont seem to think this is right. Basically, its acting a little like a lot less severe version of the one I pulled out of there with the fried pinion bearing/crush sleeve which I could move around A LOT.

What Im thinking, is that since I used new bearings, maybe they broke in and now I have too much backlash? Or, maybe the pinion bearing wasnt seated properly when I put it together and now its seated (or fried) thus nullifying the torque I had on the pinion nut when I assembled it?

The nut is still staked in the same spot, so I dont think its moved, however I left my larger sockets at work so I dont have one to throw on there and see if I can tighten it up at all. Seeing as the nut is in the same spot, Im thinking its something else inside the diff, as its pretty much obviously not the nut backing off.

Now, I used a solid spacer when I put the diff together, so Im wondering if it is simply something "seating" inside the diff, if I can get away with just re-torqing the nut down. I dont see why not, am I thinking about this wrong? With the crush sleeve, I can see how if you torque it once, then the nut comes loose or something, you would have a hard time re-torqing it since its already crushed. But, would you still have this problem with the solid spacer?

I need to replace an axle seal on the drivers side, so Im going to pull that axle out, and I figure I might as well pull the other side out and do it too, so since theyre both coming out, Im thinking Im gonna go ahead and drop the diff to recheck it all, but I was mostly looking for some info/comments/ideas.

*big sigh*

Sorry for the long post, hope someone reads it and gives some worthwhile feedback, lol.

~T.J.
 
Sounds like you don't have enough preload on the pinion bearings. How much pre-load did you put the bearings to? What was the backlash and how did the pattern look?
 
The pattern was great when I built it, as for the specs, I dont remember off the top of my head, but I remember that I set them within the high side of the new bearing range in the FSM I was working out of, that I know for sure.

I KNEW I should have written that crap down... :(

If I tear it apart and it is indeed not enough pre-load on the pinion bearings, can I just torque the nut some more since its got the solid spacer then recheck the pattern and backlash while its out? Or should I pull the carrier and re-check the pinion pre-load the "right" way?

I really just dont want to fight with the carrier bearings adjusters to set the backlash again :(

~T.J.

EDIT: I guess this is kinda stupid asking you to speculate whats wrong with the truck, I need to just pull it out and find out. Im sure once I get in there I'll remember it more-so. Now that Ive re-read the FSM, Im even starting to remember it. I posted the original post in a bit of a huff since the truck had about 10 things go wrong with it at once.

RE-EDIT: Since its got the solid spacer, it could be that I dont have it shimmed right OR the nut just wasnt tightened down enough, right? So, whats the torque spec for the pinion nut with the solid spacer? I can just recheck that, and if thats lose, tighten it. If its tight, then I know I need to reshim it, right?
 
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I would also say not enuf pre load, I would also say that you did not crush the crush collar enuf except you said you are using a solid one. The pinion should not move in and out at all and should only have a few thousandths of back-lash. If you run it like that it will grenade itself .
 
If the pre-load was good, and you have movement with a solid spacer, then you *should* be ok just tightening, and re-staking the pinion nut.

However, if the nut was loose, and even with the spacer, preload might be off now. There should be no in and out movement at the yoke.

Or so a diff guy told me.
 
Make sure the nut didn't back off--if it did then tighten it down and hope for the best. As for toque on the nut---I have no idea but I have a routine I do with the toy diffs and never have had a problem with the dozens I have done...
 
Yeah, whats boggling is if it DID back off, it stopped in a spot where it looks like its staked still, lol.

Thats why I think something just "settled" more so than the nut backing off. Anyway, as of now, I just bolted the driveline back on and said screw it until I get the rear wheel bearing parts and seals. Its not a DD driver so it can sit and wait, haha.

Thanks for the tips though guys, much appreciated.

~T.J.
 
84Toyota4x4 said:
Yeah, whats boggling is if it DID back off, it stopped in a spot where it looks like its staked still, lol.

Thats why I think something just "settled" more so than the nut backing off. Anyway, as of now, I just bolted the driveline back on and said screw it until I get the rear wheel bearing parts and seals. Its not a DD driver so it can sit and wait, haha.

Thanks for the tips though guys, much appreciated.

~T.J.

That can happen if a race isn't seated correctly.
 

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