10 bolt open diff

ktraver97ss

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Aug 29, 2007
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Roselle, IL
We are trying to do outside axle bearings on my friends Z28. I believe this is an open differential. I know to remove the axle on mine with limited slip it has the bolt holding that large pin through the carrier. My question is, on this open one can we just loosen the bolt in this pic?
NewImage3.jpg


The other side of the carrier.
NewImage2.jpg
 

Turbocharged400sbc

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that is not an open diff, looks like an auburn true trac (with helical gears that increase the side loading of the side gears and increase the force on the clutches)
the open diff's and factory lsd's both use a bolt through the end of the center pin (spider gear axle) that is in the meaty area's of the carrier.
but yes, you removee that bolt, remove the retainer plate through the opposite side, then youll be able to get em out
 

greasy

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yeah, we are doing the axle bearings, we just don't want to have to reset the gearset.

You shouldn't have to with just pulling the diff out. As long as you do not remove the pinion and keep the spacing of the diff the same on both sides you should be golden. At least that is the way it was on the Ford 8.8's I have done.

Diff removal is not required though, should just be able to pull the c-clips and out slide the axles.
 

ktraver97ss

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Aug 29, 2007
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Roselle, IL
Cool, thanks, we just did it and hoped for the best and it came out fine. It was my first time messing with a diff beside just changing the fluid so I was a little nervous about messing something up.

I thought it was open because when you spin one of the rear tires the other one spins in the opposite direction. I was under the impression that the opposite tire should spin in the same direction if it is a lsd. I was surprised it would be open as it is an LS1 Z28 though. :dunno:
 

Turbocharged400sbc

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the true track is thebest of both worlds, the lack of preload means less clutch wear and tear around corners as the clutches can easily slip, however under power the specially cut helical gears massivly increase the amount of pressure the side gears are forced outward towards the clutches with, this is increased even more if one axle is spinning faster than the other as the gears try to "climb" away from the spider gears (TPA-tooth pressure angle, the profile of the helical teeth area is what helps this), and are forced even harder into the clutches.

his clutches might be a bit worn dep on how often he's flooring it around corners, but that is a true trac right there bud, not an open diff (which has straight cut tooth profiles)

if you wanna test it get two guys one on each side with the trans in park both turn the wheels in the same direction, one of ya try to spin the tire with a little more force than the other and have a third eyeball on the side gears, you will physically see the side gears forced outward as they release and apply turning pressure (also a good way to determin the condition of the clutches, they actually have a spec for it iirc)

so toss in a tube of lsd lube
 

Turbocharged400sbc

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he isnt the orig owner is he?

a common thing i used to get stuck doing was spider gear installs on broke ass 10 bolts from one leggers, plenty of times the debreis was so bad a junkyard axle was needed/full rebuild

chances are this happened with his car and the owner was smart enough to upgrade the carrier, but may not have gotten new gears and the diff wasnet setup right or all the bearings werent replaced and the clitter glitter has been munching shit up this whole time

axle bearings, pinin bearings, and gear pattern can all contribute to that noise...if i could hear it i can probably isolate it to a bearing or the pattern, does the noise disapear on decel or light load? how bads the sparkly shit?

worn clutches wouldnt cause the noise, the glitter would wear em out faster, but on the highway the clutches are not outspinning each other, they are essentially static with the carrier
 

ktraver97ss

I say what everyone thinks
Aug 29, 2007
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Roselle, IL
Not the orig owner, he just picked it up in spring with 66k on it. It was not making this noise when he got it, it started making noise about a month ago and has gotten worse the more he drove it.

There was not much metal in the fluid, just some on the magnet and it was small powder almost, no chunks or anything.

It does not not get any quieter on decel or light load, it varies in loudness with the speed of the vehicle.

We did the outer axle bearings yesterday and were going to do the carrier bearings later this morning.
 

Turbocharged400sbc

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i have several crush sleeves, and youd still wanna check the pattern and pinion bearing preload replacing the bearings and races...pinion depth can change with new bearings and races but the current shims should have you damn close +/- a few thou

i still have all my tools for seting up rearends including a gold cert dial type in/lb wrench if you need em
 

CrunkMaro

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Jun 17, 2010
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I thought it was open because when you spin one of the rear tires the other one spins in the opposite direction. I was under the impression that the opposite tire should spin in the same direction if it is a lsd. I was surprised it would be open as it is an LS1 Z28 though. :dunno:


it'll go in the opposite direction, thats normal. it'll lock up when needed.


front pinion bearing-whines on decel
rear pinion bearing whines on accel
axle bearings whine while driving...its an oscillating noise (weeeOOOOOweeeOOO) thats the best i can do via text...it is speed sensitive
case bearing will whine constantly, never chaning
diff baering will clunk on engagement and will knock on turns
ring/pinion gears won't make noise unless something is broken, and it'll clunk



you guys replaced the axle bearings? was the axle scored? if the axle was scored then the new bearings are useless. they will still make noise, sometimes more


did you do wheel bearings?
 

ktraver97ss

I say what everyone thinks
Aug 29, 2007
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Roselle, IL
We just did them all since we had it all apart. The noise was def one of the pinion bearings, just spinning it by hand without the shafts in there you could hear the noise. Kinda sucks to put money into a 10bolt, I know, but its not mine, the car is stock, and he is unemployed, so dropping the $$ on a 12bolt is out of the question. We are putting it all back together today and hoping for the best.
 

CrunkMaro

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Jun 17, 2010
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We just did them all since we had it all apart. The noise was def one of the pinion bearings, just spinning it by hand without the shafts in there you could hear the noise. Kinda sucks to put money into a 10bolt, I know, but its not mine, the car is stock, and he is unemployed, so dropping the $$ on a 12bolt is out of the question. We are putting it all back together today and hoping for the best.

hey man...you gotta do what you gotta do to get by.
 
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