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  #16 (permalink)  
Old 06-18-2012, 01:34 PM
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Quote:
Originally Posted by bugget_jr
Iīve assembled the pinion and tried to assemble the differential with the orginal shims but it wouldnīt fit. Then I re-shimed it so the shims was about 0.04 inch less than original. With those shims it would fit if I tap them in place but it would also fit so well that itīs kind of impossible do take the differential out.
When the Carrier Brg preload is correct.. You will have to pry the carrier out of the housing. If it's to loose the carrier Brg race's will spin in the housing and you will have problems.

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  #17 (permalink)  
Old 06-24-2012, 01:23 PM
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Ok, so I have tried out all steps now and I think the shim thickness behind the pinion head bearing is correct because it has a equal lenght to the toe on both the drive and coast side. The problem now is that itīs not centered, because both the drive and coast side have to come closer to the heel. And the sources I could find says that for a face-milled gear (thatīs what I have) I have to adjust this with increasing the backlash, but I have now increased the backlash from 0.007 to 0.013 and it hasnīt changed. Have I misunderstood this? Whatīs the problem?
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  #18 (permalink)  
Old 06-24-2012, 01:34 PM
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Are you working with new or used gears?

Used gears will never get a pattern like you see in a service manual.
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Old 06-24-2012, 01:41 PM
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Itīs new gears, bought as a set.
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Old 06-24-2012, 02:08 PM
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Pictures would be a big help.

Dana Spicer Contact Info
http://www2.dana.com/pdf/5717.pdf


If the pattern is centered on the tooth on coast and drive, I would not increase the BL beyond about .010 if the pattern is not getting better.
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Old 06-25-2012, 03:45 PM
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Here is pictures, but I have a very bad camera as you may see so I donīt know if you can get something out of it. But if I describe these pictures which is as the gears is set up now: At the coast side the tooth starts at the edge of toe and travels up, at the drive side the tooth starts about 0.2 inch from toe (quite centered but a bit close to toe). The BL is now 0.011 inch and the recomended org. BL is from 0.005-0.009 for firebird -67.
this is the coast side.


this is the drive side.

Last edited by bugget_jr; 06-25-2012 at 04:05 PM.
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  #22 (permalink)  
Old 06-25-2012, 04:38 PM
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Hard to tell anything from those pics.
Take the BL out to .020" and see what you get...?
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  #23 (permalink)  
Old 06-25-2012, 08:32 PM
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Keep your backlash within spec during set up. .020 is too much. How thick is your pinion shim now? Your drive side looks to be running of the bottom. I would put a thinner pinion shim and see if it starts to come around.
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Old 06-27-2012, 11:02 AM
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how to do it

Look on u tube good video
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  #25 (permalink)  
Old 06-29-2012, 07:40 AM
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Pinion depth is way too deep. Take about .010 out of the pinion shim and try again. Keep the backlash at about .008 at all times until you get the pinion depth right. Then you can fine tune the backlash. Also, try to get the pictures in focus a little better. It's hard to see details about the pattern when the picture isn't clear.
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Old 06-29-2012, 09:10 AM
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Welcome home Freddie
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  #27 (permalink)  
Old 06-29-2012, 10:14 AM
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The pattern is heavy toward the toe on drive and coast, so PD must be close. Make sure when adjusting BL that you keep the total shim amount the same to maintain the bearing preload.
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Old 07-07-2012, 07:30 AM
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thanks for all help, understood it wasnīt easy to see the last pictures but my brothers cellphone camera was much better so hereīs an update:

coast side:


drive side:


Hereīs some of my thoughts: Whatīs most important, a soft pattern or an centered?

If I have less pinion shims doesnīt that equal to more backlash (and too far up on the top) and if I decrease the BL thatīs equal to make the pattern to far down to the toe side on both side? (you guys is probably right, Iīm just trying to figure out where I thinking wrong)

really appreciate all the help
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  #29 (permalink)  
Old 07-07-2012, 07:40 AM
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The most important thing is to get the pattern centered between the root and face. Right now your pattern is too far to the root, which means that you pinion is still too deep. Moving the pinion depth will change the root to face pattern. Backlash controlls the heel to toe pattern after the pinion depth is set correctly. Look at the pattern that you have now. Don't pay any attention to where it is located heel to toe, only look at root to face. Keep reducing the pinion shim until the pattern is centered between the root and face of the tooth. The pattern should get wider as it moves away from the root. Each time you change the pinion depth you will have to reset the backlash. Keep the backlash at about .007 to .009 until you get the pinion depth correct. Then you can make slight changes to the backlash to fine tune the pattern.
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  #30 (permalink)  
Old 07-08-2012, 11:38 AM
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alright, so I changed the pinion a bunch of times and with a 0.026" shim gives the widest pattern I think, also the 0.02 shim makes a wide pattern. I took some photos on a bunch of shims, because Iīve tried all possible shim combinations now and it wonīt get centered.

0.026 shims with good BL gives:



0.02 shim with good BL gives:



0.017 shim with good BL gives:



Is the 0.026" shim good?
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