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Is my diff working correctly?

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Old Sep 30, 2013 | 07:13 PM
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Default Is my diff working correctly?

Frame off. 69. Diff only no half shafts.
When I turn the pinion one output yoke (very slightly noticeable) seems to engage after a minute turn of the yoke. The other side output yoke seems to be "engaged" always. Is this normal ? This is the standard diff. I ask because I only briefly drove the car in the yard before I proceeded to tear it all the way apart for a frame off. I'd hate to have to go back in two years when I'm done and revisit the diff.
Also I replaced all seals and added new fluid. I even torqued the pinion nut to have (iirc) the amount of resistance called for in the service manual.

Last edited by CAMS69; Sep 30, 2013 at 07:15 PM.
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Old Sep 30, 2013 | 08:14 PM
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Never saw an early c3 with a standard diff, but if that is the case if you hold the pinion so it doesn't turn then rotate either side flange and the other should turn the opposite direction. This is how they compensated for difference in wheel travel radius/wheel speed while turning.

Mark
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Old Oct 1, 2013 | 09:21 AM
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Default Backlash?

Ok I believe what i'm asking about is called pinion backlash.
I'm assuming by me turning the pinion by hand and seeing the minute lag of movement of one of the output yokes, I'm seeing backlash.
Remember this car is off the ground, no wheels
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Old Oct 1, 2013 | 09:49 AM
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how far can you turn the pinion before the 2nd yoke starts to turn.

when you turn the pinion, do both yokes turn the same direction.

I believe pinion back lash should only be 8-10 thousandths
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Old Oct 1, 2013 | 10:08 AM
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Originally Posted by spjrr
...Never saw an early c3 with a standard diff...
Could be. Positraction was not standard until the 1970 model year. For 68 and 69, specific options required it, but the Posi was not standard equipment.
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Old Oct 1, 2013 | 10:15 AM
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Thanks 4 speed.
Iirc they both will turn the same way.
I'll have to check when i get home.
I bet it is the backlash seems to be ( if I had to guess)
8 thou. I'll check. Heck how can I check backlash? Lol
It just seems that momentary "lag" before it engages would be detrimental , but I'm probably thinking too much.
The reason it concerned me was it seems if I turn the pinion slightly one one then the other I can "feel" a tick tick
I don't know a word to describe the sound I'm hearing but it is so slight.
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