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Old May 28th, 2008, 09:32 AM   #1
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Default Dana 44 Pinion preload issue

So I managed to grenade my inner pinion bearing on my rear Dana 44. I bought new pinion bearings/races and a seal and now I have a problem. I re-used the shims that set the pinion depth. I also re-used the shims that set the bearing preload. This is where my problem is. As I tighten the pinion nut down, the pinion becomes too tight to turn. I believe this means that I need more shims under the outer bearing to increase the distance between the inner and outer bearings which loosens up the rotational force on the pinion. Here is my question: Why would this change so much? I used the exact same shims in the exact same location and now it is too tight. I understand that these are different (new) bearings, but it isn't even close.

I did confirm that both races and the inner bearing are seated all of the way.

Where can I buy (locally) some pinion shims? Anyone have some extras?
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Old May 28th, 2008, 10:36 AM   #2
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i think you have it back words you want to remove shims from behind the upper pinion bearing cup or off of the pinion. is this not a crush sleeve axle

im confused but yes you may be right either add them to the pinion or remove them from behind the outer bearing race
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Old May 28th, 2008, 10:37 AM   #3
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This is not a crush sleeve axle.
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Old May 28th, 2008, 10:52 AM   #4
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OK, I found this:

Preload Shim Design: Clean the shims completely so that there are no particles that may cause a false preload reading or cause the shim stack to change thickness over time as the vehicle is driven. Slide the shim pack over the pinion shaft to the shelf. Use the original shims on the first assembly or add 0.003" to the original preload shims to make up for the bearings settling into the housing. Tighten the pinion nut to approximately 250 foot pounds. Go slowly so as not to damage the bearing if the preload shim stack is not thick enough. Use an inch-pound torque wrench to check the preload. If the preload is too loose then remove shims so that the bearings will be tighter against the races and increase the preload. If the preload is too tight then remove the pinion gear and add shims so that the bearings will not be as tight against the races.

Here: http://www.differentials.com/install.html

Sounds like I need more shims. Jeff's Bronco Graveyard has them for $10.

I still don't understand why it changed so much.
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Old May 28th, 2008, 10:54 AM   #5
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Quote:
Originally Posted by hosejockey4506 View Post
i think you have it back words you want to remove shims from behind the upper pinion bearing cup or off of the pinion. is this not a crush sleeve axle

im confused but yes you may be right either add them to the pinion or remove them from behind the outer bearing race
x2

Too many shims under outer pinion race, or you simply tightened the pinion nut too much.
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Old May 28th, 2008, 11:15 AM   #6
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Originally Posted by Mikey1258 View Post
x2

Too many shims under outer pinion race, or you simply tightened the pinion nut too much.

I did not over-tighten the pinion nut. It is supposed to be torqued to 250ft-lbs. I tightened it by hand with a short wrench. Also, if you read my post above, it states that:

If the preload is too tight then remove the pinion gear and add shims so that the bearings will not be as tight against the races.

Basically you need to add shims between the outer bearing and the pinion to increase the distance between the bearings thus loosening up the preload. There are no shims under the outer race. If there were shims under the outer race, then I agree that they would need to be removed.

I found these instructions after I posted my original question.
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Old May 29th, 2008, 02:40 PM   #7
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Quote:
Originally Posted by TopHeavy View Post
I did not over-tighten the pinion nut. It is supposed to be torqued to 250ft-lbs. I tightened it by hand with a short wrench. Also, if you read my post above, it states that:

If the preload is too tight then remove the pinion gear and add shims so that the bearings will not be as tight against the races.

Basically you need to add shims between the outer bearing and the pinion to increase the distance between the bearings thus loosening up the preload. There are no shims under the outer race. If there were shims under the outer race, then I agree that they would need to be removed.

I found these instructions after I posted my original question.
Just trying to help. I did read your post. I am happy you figured it out because that crap can be frustrating. FYI your response was not very polite, I was just offering a hand.

ty
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