Good Sam Club Open Roads Forum: Tow Vehicles: Differential fluid change
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agesilaus

North Florida

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Posted: 04/28/20 07:40pm Link  |  Quote  |  Print  |  Notify Moderator

FishOnOne wrote:

agesilaus wrote:

OK this is my first time doing this. I have the correct fluid and I hope the correct gasket. My question is: do I use permatex on the gasket or leave it clean?


Curious how many miles you have on your '12 truck.

133K it mostly gets a workout during summer tho that's about to change as we plan to go semi fulltime. If camping ever opens up again.


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Blacklane

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Posted: 04/28/20 08:25pm Link  |  Quote  |  Print  |  Notify Moderator

Another vote for no gasket.

On a previous truck, I installed a gasket instead of sealant. Years later during a hard tow, the gasket failed and a lot of fluid was lost, coating the hitch, where it was evident.

It turned out that all of the bolts were loose. Since I know they were torqued properly and to specs, I think the paper gasket softened and compressed over time, reducing the pressure on the bolts. I tightened the bolts, added a lot more fluid and continued the trip, but a few months later the differential was shot and had to be rebuilt.

That problem never happens to people who use sealant.

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Posted: 04/29/20 05:34am Link  |  Quote  |  Print  |  Notify Moderator

Cummins12V98 wrote:

You should forget the gasket! This stuff is AWESOME!!! Never had a leak.

Second pic in appropriate weight if you want to do it BEST.

[image]
[image]


X2 on second pic. You will also notice a bit of an uptick in MPG. I did.


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dodge guy

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Posted: 04/29/20 05:55am Link  |  Quote  |  Print  |  Notify Moderator

agesilaus wrote:

No fins and I actually have a gasket from RockAuto but everyone is telling me to use the silicone RTV.


If you have he stamped steel then yes use the RTV. Although now would be he time to install thenOEM finned cover. I bought mine for $55. It was new. I think maybe from Amazon.


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Posted: 04/29/20 06:22am Link  |  Quote  |  Print  |  Notify Moderator

agesilaus wrote:

Thanks for all the replies, I'm off to get the right permatex.

I got the fluid as specified in the manual, no friction additive that's was for older models I think. And I have a little pump for the fluid and a 20V Dewalt impact wrench for all the bolts.


BarabooBob wrote:

Last week I changed the rear differential gear oil on my 2011 F150. The spec call for 75W-140 full synthetic with a friction modifier added. I used ultra black permatex on the case cover. Everything went great. The bolts on the differential are to be torqued to 33 lb-ft.


Agesilaus, sure hope the /0volt impact wrench is for removing the cover and not installing! Always best to tighten bolts to the correct torque during install.


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agesilaus

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Posted: 04/29/20 06:27am Link  |  Quote  |  Print  |  Notify Moderator

Quote:

Agesilaus, sure hope the /0volt impact wrench is for removing the cover and not installing! Always best to tighten bolts to the correct torque during install.


I have reconsidered that plan and will use a socket wrench probably a 3/8" and I have a new torque wrench to bring the bolts up to spec.

Me Again

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Posted: 04/29/20 08:39am Link  |  Quote  |  Print  |  Notify Moderator

Cummins12V98 wrote:

This squeeze bag works GREAT. No pump needed.

[image]


That is what Ron and I used on my last fluid change and the bags work great! Chris

* This post was edited 04/29/20 09:34am by Me Again *


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fj12ryder

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Posted: 04/29/20 11:27am Link  |  Quote  |  Print  |  Notify Moderator

All of the differential fluid I've gotten has always come in a squeezable bottle. Clip the cap and away you go.


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FishOnOne

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Posted: 04/29/20 11:56am Link  |  Quote  |  Print  |  Notify Moderator

agesilaus wrote:

FishOnOne wrote:

agesilaus wrote:

OK this is my first time doing this. I have the correct fluid and I hope the correct gasket. My question is: do I use permatex on the gasket or leave it clean?


Curious how many miles you have on your '12 truck.

133K it mostly gets a workout during summer tho that's about to change as we plan to go semi fulltime. If camping ever opens up again.


Yeah that's a pretty good amount of miles.

I wonder how effective running a tube down into the differential and sucking out the lube would be instead of having to remove the cover.
All this fluid change discussion is making me get the itch to change mine out.


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Cummins12V98

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Posted: 04/29/20 12:26pm Link  |  Quote  |  Print  |  Notify Moderator

fj12ryder wrote:

All of the differential fluid I've gotten has always come in a squeezable bottle. Clip the cap and away you go.


Hard plastic squeezable right? He one I showed is much easier to use in thighs places.


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