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Old 06-20-2018, 02:17 PM   #1
Everett Vassar
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Default 12 bolt differential cover

I have mine off to do a little repair work. Before I put it back on, thought I would ask about the ones that have the bolts through the back. This is supposed to increase strength and rigidity to the main caps? Wouldnt this also increase bearing pre load? Is there really any advantage to these?
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Old 06-20-2018, 02:29 PM   #2
Lenny5160
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Default Re: 12 bolt differential cover

No scientific proof, but my 12 bolt gears seemed to last longer after switching to one of those LPW covers. Adds stability in the housing.
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Old 06-20-2018, 02:30 PM   #3
CMcAllister
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Default Re: 12 bolt differential cover

The load screws are only lightly loaded against the caps, not enough to change any of the set-up dimensions or pre-loads. The cover basically acts as a girdle to support the main caps as the pinion tries to push the carrier out the back of the housing. It certainly can't hurt and I expect it is beneficial enough to use them on stuff I do.
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Old 06-20-2018, 02:46 PM   #4
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Default Re: 12 bolt differential cover

The instructions do state to torque the load bolts to 10 lb/ft, as more torque can distort the bearings.
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Old 06-20-2018, 02:58 PM   #5
Jeff Stout
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Default Re: 12 bolt differential cover

Quote:
Originally Posted by CMcAllister View Post
The load screws are only lightly loaded against the caps, not enough to change any of the set-up dimensions or pre-loads. The cover basically acts as a girdle to support the main caps as the pinion tries to push the carrier out the back of the housing. It certainly can't hurt and I expect it is beneficial enough to use them on stuff I do.
^^ This
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Old 06-20-2018, 04:00 PM   #6
Everett Vassar
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Default Re: 12 bolt differential cover

Sounds good to me....also differential lube questions. . what brand? What weight? And how much lube?...thanks again
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Old 06-22-2018, 10:12 AM   #7
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Smile Re: 12 bolt differential cover

I use one liter of Royal Purple 75/90 synthetic.
12 bolt. I use the same stuff in my Jerico DR4.
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Old 06-22-2018, 10:40 AM   #8
Lenny5160
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Default Re: 12 bolt differential cover

I've always stuck with good old Valvoline dinosaur 80w-90.
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