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Old 04-07-2013, 05:59 AM
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ford 9" gears

I have a 9" with a detroit locker and swaped out the 3.90 for 3.70 that I got at a swap meet. Befor I pulled the pinion and ring gear out I checked the back lash and it was .008 I installed the new ones at that also. Went for a drive today and after about a mile I could hear a whining when I would accelerate even under light acceleration. I pulled the center section back out and there was about .006 backlash a friend told me that is to tight so I backed it out to .010 now it seems to whine when I let off the gas. Where am I screwing up

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Old 04-07-2013, 07:59 AM
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How did you set the pinion depth?
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Old 04-07-2013, 08:12 AM
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I was told to reuse the crush sleeve so I put it together the same as it came apart, how do I check for proper depth
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Old 04-07-2013, 08:17 AM
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There is where your problem is. There is much more to setting up a set of gears than just setting the backlash. You must set the pinion depth, bearing preload and backlash to get the correct contact pattern. You must use gear marking compound to check the pattern nd you must know how to read the pattern to know what adjustments need to be made to the pinion depth and backlash.
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Old 04-07-2013, 08:42 AM
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I set the pinion preload at6 6 inch pounds then put out together set the backlash used marking compound and it showed to be running towards the inside of the ring gear so I put a shim in the pinion housing re set back lash and remarked the pattern and looked like it was running in the middle of the gear now.
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Old 04-07-2013, 04:48 PM
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Are the bearings new or used? Was the pattern favoring the root or face of the tooth?
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Old 04-08-2013, 05:10 AM
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It seems that the entire face of the tooth is making contact
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Old 04-08-2013, 05:57 AM
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Are the bearings new or used?
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Old 04-08-2013, 06:26 AM
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also used gears will likely whine as your pattern will not exactly match the original pattern
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Old 04-08-2013, 10:30 AM
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They are used bearings but looked good and smooth, I probably should have gotten new gears
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Old 04-08-2013, 11:11 AM
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I would have at least used new pinion bearings. Are you sure that the pinion bearings are tight enough? Is the pinion being held tight in the bearings so that it can't move around? Can you post pictures of th econtact pattern?
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Old 04-08-2013, 07:24 PM
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I am planning on getting new gears and bearings and having someone with more experience help me install but here is the best pictures I could get
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Old 04-08-2013, 07:36 PM
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I can't see any pattern on the gear. Do you have any gear marking compound?
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Old 04-21-2013, 12:51 PM
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I put new gears and bearings in , the pinion gear had 1.028 engraved on the front so I set the pinion depth as close as I could get to that the back lash is at .010 so how does this pattern look
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Old 04-21-2013, 05:00 PM
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The pinion is too deep. Add some shim to it and try again.
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