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Old 03-11-2017, 03:16 PM   #1
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Differential Bolt Torque

Just finished fabricating my rear track bar and planning on installing it this week. I can't find the proper torque for the replacement differential bolts. I was told 120# but can't verify it. Also is thread sealer necessary on the bolts (I vaguely remember reading a post where diff fluid leaked from the bolts) or is blue loctite sufficient?

Thanks in advance.
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Old 03-11-2017, 06:30 PM   #2
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Steel bolt torque specifications. The gasket does the sealing if bolt torque is correct and new gasket used.
It will not harm anything to use a gasket sealer though.
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Old 03-11-2017, 06:57 PM   #3
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Don't know for sure on the interior punkin design, but if any of the holes are drilled through the housing to the inside, which I suspect they are, then oil can leak past the bolt threads.
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Old 03-11-2017, 07:17 PM   #4
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Better Check with the manufacturer or Google until you find it. You don't want to make a mistake. Using a bolt torque chart could cause you grief.
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Old 03-11-2017, 08:58 PM   #5
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Torque for the cover bolts of the Dana 80 are 30 ft./lbs. An easy google search will return torque values for other axles if appropriate.


I suggest you spend some time thinking this over if you really are going to fasten a rear track bar to the pumpkin cover.


If this is not your plan, then please disregard the following.


The pumpkin area where some after market kits fasten to the axle is the weakest possible place. It is cast steel or iron (not much difference) and of very thin cross section. 30 ft./lbs. of torque is insufficient clamping force to secure the forces in play here. Think of hammer blows to this material when encountering side loaded bumps at speed. A medium weight hammer blow, by hand, can shatter this material. Some of us in the Jeep off road world have tried this attractive short cut and paid a price.


The other, more sane option that most other kits use, is to attach to the track bar bushing mount. This also is weak, but the geometry is better. The bar is longer and forces less lateral push / pull to the axle. When this method fails, it will not fragment the differential.

One does not use a fastener backed up by a gasket sandwich as a structural member that will endure side impulse loading.



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Old 03-11-2017, 09:12 PM   #6
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Because the question has come up again I checked the thread that was started back in 2013 on the DIY rear Track Bar for the F-53 chassis.

All of my ford factory CD's state that the differential cover bolt torque is 45 Ft/lbs. My TB is bolted to the differential cover using 4 of the bolts. It has been on the coach since 2013 and probably has 15,000 miles on it with no issues.

Many commercially designed TB's also use the differential cover bolts as anchors for the TB plate. I also added some blue lock tight as added insurance against them coming loose.

There was a question on the original DIY thread about using a DF gasket as a template. Nobody could find a DF cover gasket because Ford installs the cover using just gasket cement and no gasket.

I'm not disputing what PSOUZA has posted but many have designed a TB like the one posted below and so far nobody has had any issues at all. I'm sure if issues had come up I'd heard about it.
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Old 03-11-2017, 09:18 PM   #7
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Rear Track Bar F-53 chassis

Here's some pics of the revamped design for the rear TB. As you can see the 1/2" plate is securely held in place by 4 of the DF cover bolts which are 1/2" longer than the stock bolts.

It will be getting a bit warmer in a few weeks so that's when I'll go under and check the torque on the MODS that have been installed under the RV. If I notice any that are loose I'll be sure and post it.
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Old 03-11-2017, 09:21 PM   #8
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Blue Loctite is good and will also prevent leaks if the prep is good.


Fortunately what others have done regarding this method is one of the few major world problems that does not have my name on it.


Best of luck.


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