Rear diff
Post Fiend
Joined: Mar 2009
Posts: 11,798
Likes: 14
From: Mt. Shasta California
Not all rear axles have crush sleeves. His Dana 70HD uses shims instead. The crush sleeve if for setting proper pinion bearing preload (the bearings require a certain amount of pressure applied to them) NOT for keeping the pinion nut tight. The locking pinion nut does that itself.
Post Fiend
Joined: Mar 2009
Posts: 11,798
Likes: 14
From: Mt. Shasta California
Not all rear axles have crush sleeves. His Dana 70HD uses shims instead. The crush sleeve if for setting proper pinion bearing preload (the bearings require a certain amount of pressure applied to them) NOT for keeping the pinion nut tight. The locking pinion nut does that itself.
Lead Driver
Joined: Aug 2002
Posts: 6,682
Likes: 12
From: Saskatoon SK Canada
Dana axles use shims either on the pinion or behind the pinion race to set pinion depth. It then has another set of shims that sit behind the outer pinion bearing which sets bearing preload.
This is taken directly from the Dana 70 service manual:
Note the last paragraph.
Crush sleeves serve the same purpose. Instead of using shims to set a specific dimension between the two pinion bearings, the pinion nut is torqued to squish the crush sleeve to the required dimension. Crush sleeve eliminator kits come with a spacer and final tolerance is set with shims.
When there is no bearing preload left in a differential is when its time to replace the bearings. I've rebuilt a GM 10 bolt, Sterling 10.25 and the Dana 70 in my truck.
If the shim or crush sleeve is used to keep the pinion nut from falling off? How do front hub bearings of FWD cars not have them to keep the axle nuts on? Those nuts are torqued to set a proper preload. I've seen them fail from over and undertorque, along with impact gun abuse.
This is taken directly from the Dana 70 service manual:
Note the last paragraph.
Crush sleeves serve the same purpose. Instead of using shims to set a specific dimension between the two pinion bearings, the pinion nut is torqued to squish the crush sleeve to the required dimension. Crush sleeve eliminator kits come with a spacer and final tolerance is set with shims.
When there is no bearing preload left in a differential is when its time to replace the bearings. I've rebuilt a GM 10 bolt, Sterling 10.25 and the Dana 70 in my truck.
If the shim or crush sleeve is used to keep the pinion nut from falling off? How do front hub bearings of FWD cars not have them to keep the axle nuts on? Those nuts are torqued to set a proper preload. I've seen them fail from over and undertorque, along with impact gun abuse.
Post Fiend
Joined: Mar 2009
Posts: 11,798
Likes: 14
From: Mt. Shasta California
Dana axles use shims either on the pinion or behind the pinion race to set pinion depth. It then has another set of shims that sit behind the outer pinion bearing which sets bearing preload.
This is taken directly from the Dana 70 service manual:
Note the last paragraph.
Crush sleeves serve the same purpose. Instead of using shims to set a specific dimension between the two pinion bearings, the pinion nut is torqued to squish the crush sleeve to the required dimension. Crush sleeve eliminator kits come with a spacer and final tolerance is set with shims.
When there is no bearing preload left in a differential is when its time to replace the bearings. I've rebuilt a GM 10 bolt, Sterling 10.25 and the Dana 70 in my truck.
If the shim or crush sleeve is used to keep the pinion nut from falling off? How do front hub bearings of FWD cars not have them to keep the axle nuts on? Those nuts are torqued to set a proper preload. I've seen them fail from over and undertorque, along with impact gun abuse.
This is taken directly from the Dana 70 service manual:
Note the last paragraph.
Crush sleeves serve the same purpose. Instead of using shims to set a specific dimension between the two pinion bearings, the pinion nut is torqued to squish the crush sleeve to the required dimension. Crush sleeve eliminator kits come with a spacer and final tolerance is set with shims.
When there is no bearing preload left in a differential is when its time to replace the bearings. I've rebuilt a GM 10 bolt, Sterling 10.25 and the Dana 70 in my truck.
If the shim or crush sleeve is used to keep the pinion nut from falling off? How do front hub bearings of FWD cars not have them to keep the axle nuts on? Those nuts are torqued to set a proper preload. I've seen them fail from over and undertorque, along with impact gun abuse.
Thread Starter
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New User
Joined: May 2013
Posts: 6
Likes: 0
Well after pulling the pinion out and inspecting it. There is no crush sleeve just spacers, the spacer between the gear and bigger bearing was destroyed. Any idea what size is supposed to go in between there.
Post Fiend
Joined: Mar 2009
Posts: 11,798
Likes: 14
From: Mt. Shasta California
I hated setting up the ones with shims because you have to have the right shims on hand and you end up taking it apart and putting it together a bunch of times since there is a fine line between too loose and too tight........ugh. I haven't done those for many years but it would be easier if you used a dial indicator and a micrometer to determine the shim thickness(s).
Lead Driver
Joined: Aug 2002
Posts: 6,682
Likes: 12
From: Saskatoon SK Canada
Riggins cleaning
There is no "set" specifications for the bearing preload shims. They service manual says to start at 0.060" and take a reading, then adjust the shims accordingly till you get the proper reading. This requires you to remove the axles and carrier from the housing. You will have to buy a pinion preload shim kit plus have a torque wrench capable of 250 ft lbs.
Here is a link to the Dana 70 service manual:
http://www2.dana.com/pdf/5312-9.pdf
Post Fiend
Joined: Mar 2009
Posts: 11,798
Likes: 14
From: Mt. Shasta California
Your the one that said the crush sleeve keeps the nut from coming off.
Yet I have never seen an axle that does not use a locking nut and every one I've removed to change pinion seals requires effort from the impact gun. The point is bearings need preload for long life. The higher the acting force, the higher the preload is to keep it in tolerance. The side carrier bearings on a Dana axle typically have 0.015" of shims over what would be considered zero lash. If the sole purpose of the crush sleeve was to just keep the nut from coming off, then manufacturers would just have a set torque spec for the pinion nut. Instead they do not give a torque spec and require you to tighten the nut to get a proper rolling resistance which can take anywhere from 300-600 ft lbs.
Riggins cleaning
There is no "set" specifications for the bearing preload shims. They service manual says to start at 0.060" and take a reading, then adjust the shims accordingly till you get the proper reading. This requires you to remove the axles and carrier from the housing. You will have to buy a pinion preload shim kit plus have a torque wrench capable of 250 ft lbs.
Here is a link to the Dana 70 service manual:
http://www2.dana.com/pdf/5312-9.pdf
Yet I have never seen an axle that does not use a locking nut and every one I've removed to change pinion seals requires effort from the impact gun. The point is bearings need preload for long life. The higher the acting force, the higher the preload is to keep it in tolerance. The side carrier bearings on a Dana axle typically have 0.015" of shims over what would be considered zero lash. If the sole purpose of the crush sleeve was to just keep the nut from coming off, then manufacturers would just have a set torque spec for the pinion nut. Instead they do not give a torque spec and require you to tighten the nut to get a proper rolling resistance which can take anywhere from 300-600 ft lbs.
Riggins cleaning
There is no "set" specifications for the bearing preload shims. They service manual says to start at 0.060" and take a reading, then adjust the shims accordingly till you get the proper reading. This requires you to remove the axles and carrier from the housing. You will have to buy a pinion preload shim kit plus have a torque wrench capable of 250 ft lbs.
Here is a link to the Dana 70 service manual:
http://www2.dana.com/pdf/5312-9.pdf
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