Clutches for 10 bolt 8.5 anti-spin
January 31st, 2012, 10:08 AM
#3
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GM discontinued those over 2 years ago,but there are a few differential suppliers that still have some left over.Try DTS.I bought a few sets from Ratech awhile back,but I noticed theirs are discontinued too.
The other option is to find a 2-series posi unit,and rob the clutches out of it.You can get one of those for less then what you could find new clutches,if you can find them at all.Mine are not for sale.
The other option is to find a 2-series posi unit,and rob the clutches out of it.You can get one of those for less then what you could find new clutches,if you can find them at all.Mine are not for sale.
February 1st, 2012, 08:02 AM
#5
February 1st, 2012, 09:39 AM
#6
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Sounds like it wasn't shimmed tight enough to begin with,which is common from a regular production posi unit.They assembled those fairly vague back then.I have also owned NOS units,and I found those to need more shim as well.The most amount of shim I ever added to one of those posi units was .074" more.That's A LOT!About .035 on one side,and .038 or so on the other,along with the factory shims that were already in there.However,the original clutches were mint,and I was able to reuse them in the unit.
February 1st, 2012, 09:55 AM
#7
Sounds like it wasn't shimmed tight enough to begin with,which is common from a regular production posi unit.They assembled those fairly vague back then.I have also owned NOS units,and I found those to need more shim as well.The most amount of shim I ever added to one of those posi units was .074" more.That's A LOT!About .035 on one side,and .038 or so on the other,along with the factory shims that were already in there.However,the original clutches were mint,and I was able to reuse them in the unit.
the clutches where installed new by a certified GM tech with the 300 lb s-spring in 2003.
February 1st, 2012, 11:18 AM
#8
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The spring doesn't do all of the work.If you shim it tight enough,you can actually do away with it.No,they were not intended for what we use them for now,but I've gone pretty fast with a bunch of power thrown at those units.They are pretty good.Forget about the HP.It's the torque or blunt force that gets you off homeplate.If you get things too hot in there,from the friction,they will weld themselves together,but again,that is usually from a loose unit,and someone taking a lunchbreak in the water box,thinking their tires aren't sticky enough yet.
Basicly,with the whole unit assembled,if you have any play in the spider gears,it can take more shim.You might have to get a little crafty about how to stuff them in there,but put as much in as possible.
Basicly,with the whole unit assembled,if you have any play in the spider gears,it can take more shim.You might have to get a little crafty about how to stuff them in there,but put as much in as possible.
February 1st, 2012, 12:03 PM
#9
The spring doesn't do all of the work.If you shim it tight enough,you can actually do away with it.No,they were not intended for what we use them for now,but I've gone pretty fast with a bunch of power thrown at those units.They are pretty good.Forget about the HP.It's the torque or blunt force that gets you off homeplate.If you get things too hot in there,from the friction,they will weld themselves together,but again,that is usually from a loose unit,and someone taking a lunchbreak in the water box,thinking their tires aren't sticky enough yet.
Basicly,with the whole unit assembled,if you have any play in the spider gears,it can take more shim.You might have to get a little crafty about how to stuff them in there,but put as much in as possible.
Basicly,with the whole unit assembled,if you have any play in the spider gears,it can take more shim.You might have to get a little crafty about how to stuff them in there,but put as much in as possible.
February 1st, 2012, 04:26 PM
#10
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February 2nd, 2012, 06:32 PM
#11
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Location: Richfield, Oh
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clutches
That is for a complete 2 series posi unit and they are not new they are good used. Almost good try.
Jesse442- Have you disassembled the posi yet? Look at the clutches before writing them off. Unless you have actual chunks of clutches at the bottom of the case. If it is just silt that can be from bearings and clutches and anything that happen in the past that was not cleaned out totally. Jim
Jesse442- Have you disassembled the posi yet? Look at the clutches before writing them off. Unless you have actual chunks of clutches at the bottom of the case. If it is just silt that can be from bearings and clutches and anything that happen in the past that was not cleaned out totally. Jim
February 3rd, 2012, 06:06 AM
#12
That is for a complete 2 series posi unit and they are not new they are good used. Almost good try.
Jesse442- Have you disassembled the posi yet? Look at the clutches before writing them off. Unless you have actual chunks of clutches at the bottom of the case. If it is just silt that can be from bearings and clutches and anything that happen in the past that was not cleaned out totally. Jim
Jesse442- Have you disassembled the posi yet? Look at the clutches before writing them off. Unless you have actual chunks of clutches at the bottom of the case. If it is just silt that can be from bearings and clutches and anything that happen in the past that was not cleaned out totally. Jim
February 3rd, 2012, 08:59 AM
#13
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Make sure you surface that side gear,to make sure the new clutches will seat flat.Anything sticking up will create an unwanted gap,then tear-up the new clutch,and put you back where you are now.
February 3rd, 2012, 09:02 AM
#14
If I can find clutches, I intend on replacing the side and spiders....at least they are available aftermarket for relatively cheap....
February 3rd, 2012, 06:57 PM
#15
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????
I do not think so...lol. Jim
the GM units are a dead posi. That is why I try to talk most of my customer into the aftermarket units.
I found three sets at dealerships around the USA and they wanted 300+ for the set. That is as much as a new posi already. DUMP the stock unit if your going all this distance and buy a HD aftermarket unit that will hold and have parts avaialble down the road. Jim
the GM units are a dead posi. That is why I try to talk most of my customer into the aftermarket units.
I found three sets at dealerships around the USA and they wanted 300+ for the set. That is as much as a new posi already. DUMP the stock unit if your going all this distance and buy a HD aftermarket unit that will hold and have parts avaialble down the road. Jim
February 15th, 2012, 05:38 AM
#18
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Please contact Bruce Ponti bponti442@aol.com
Bruce is a good friend of mine and he had the 8.5 Clutch Kit manufactured. Each kit has 8 eared and 6 splined steel clutches. There are 2 of each shim: .010, .015, .020, .025, .030 and .035.
DSCF0670_zpsa3046148.jpg
DSCF0672_zpsf6ec243b.jpg
DSCF0675_zps7d3c3818.jpg
DSCF0677_zps6a7e5ca7.jpg
attach3_zps0af8b479.jpgattach2_zps03bbc3f6.jpgattach_zps83bf4fb6.jpgattach10_zps1457e415.jpgattach9_zps3d13289e.jpgattach8_zpsd12e39eb.jpg
Bruce is a good friend of mine and he had the 8.5 Clutch Kit manufactured. Each kit has 8 eared and 6 splined steel clutches. There are 2 of each shim: .010, .015, .020, .025, .030 and .035.
DSCF0670_zpsa3046148.jpg
DSCF0672_zpsf6ec243b.jpg
DSCF0675_zps7d3c3818.jpg
DSCF0677_zps6a7e5ca7.jpg
attach3_zps0af8b479.jpgattach2_zps03bbc3f6.jpgattach_zps83bf4fb6.jpgattach10_zps1457e415.jpgattach9_zps3d13289e.jpgattach8_zpsd12e39eb.jpg
Last edited by 1984 Hurst Olds; January 4th, 2014 at 08:53 AM.
February 16th, 2012, 05:43 AM
#19
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Location: Richfield, Oh
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Like I said after all this trouble you might as well just get a better posi and be done. One of these trying to buck the horse deals....
New units are stronger and plenty of parts to rebuild down the road.... PLUS it sounds like you really punish your diff so upgrade like it should have been done years ago.
Jim
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