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Old 08-18-2014, 09:24 AM   #1
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Dana 30 Power Lock LSD

I have a Power lock in my front dana 30 axle. Since I lifted my jeep it does not seem to work no more. I am running 33" mud tires. When I was running 31's both front wheels would spin now I am only getting 1 to spin in the mud. Does any one know how to tune these limited slip units. Thank you atswilson.

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Old 08-18-2014, 09:41 AM   #2
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Attachment 1403250

This is a Power Traxx locker. There isn't any "fine tuning" to be done on it. If you look on the outer edges you can see the square "teeth" that mesh and cause the axle to turn.

I would say that on yours, the square edges have rounded off and now it just slips.

This is the main reason that these lunchbox style lockers are only $250. Because they are prone for failure if you get too much traction and spin at the same time.

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Old 08-18-2014, 01:27 PM   #3
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Thanks.

Mine is not a locker. It is clutch driven posi unit or limited slip unit. I have emailed around asking about heavier clutches. So far no response. The Power lock came factory in the 1970's and 80' jeeps, scouts and some bronco's.

Thank you,
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Old 08-18-2014, 03:13 PM   #4
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Do you have the stock vaccum shift front dana 30? If so are you sure that the PS axle is even being engaged? This could cause the 3 wheel action.
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Old 08-18-2014, 03:18 PM   #5
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I bet AllMudd is right, I bet you got a vac. tube pinched or pulled out of your actuator when you did your lift.

The actuator is cheap and prone to failure, check for vac. line being connected, and vac. being present, if you have both, swap the actuator.
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Old 08-18-2014, 03:27 PM   #6
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It is always the lightest wheel that spins. Does not matter which side.

No vac. shift system on this one. My 4wd is working great. The posi unit just is not strong enough to make both front tires spin since I went with 33" tires. I have a locker in the rear and both rear tires spin and only 1 front tire spins. Prior to putting the 33" both front tires would spin. You can jack it up and by hand you cannot force the tires to spin in opposite directions. They always spin together when jacked up. The Posi is still working it just is not strong enough.

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Old 08-18-2014, 03:30 PM   #7
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Ahh...well that make sense too, if def. sounds like your clutches are worn, 33's will have more leverage to overcome the locking power of your clutches than the 31's did.

My first course of action would be a fluid change, and add the posi additive to the diff. to see if you can give the clutches a little more help biting the steel plates. This is prob. only a short term fix, eventually you are going to need new springs, or a complete rebuild.
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Old 08-18-2014, 03:33 PM   #8
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I may have the Power Lock spelled wrong. It could be Power Lok. I found clutches for them at East coast gears. They still make these Posi units for larger Dana axles like the 60 & 70.
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Old 08-18-2014, 03:36 PM   #9
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The only parts I have been able to find so far for this unit is clutches. Not sure if They offer a complete rebuild kit for it. I will have to call them and ask. Thank you.
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Old 08-18-2014, 03:40 PM   #10
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I was hoping that someone has played with this type of posi before and new a way of tuning it or adjusting it to where it would be stronger.

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