What is this plug/bolt for?

[Kirkinsb]

Can anyone tell me what this plug/bolt on our diff is for?

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[Kirkinsb]

I assumed it was to check diff fluid level....but mine is froze....cannot budge it. I was able to easily remove the plug right above it....that is silver in the picture. Thoughts?

 

[AZTVR]

Yes, the plastic looking plug is for accessing the fluid. Oil level should be about 1/4 inch below the plug opening.

http://forums.viperclub.org/threads/659436-Differential-oil-change...

 

[Allan]

That is the 'fill plug'.

I never use it though. I fill using the plug above that. The above plug is a return provision for adding a diff cooler to the car.

Don't fill all the way to the upper plug hole. -that would be way overfilled.
I put in a quart and a half, plus the additive and call it good.
Ends up being a little over, but not enough to cause any problems or leaks.

 

[Kirkinsb]

Thanks guys...my lower fill plug is basically frozen then. I could not budge the thing. Broke an allen socket off in it!!! I used the top one like Allan does to put in some friction modifier. Did a gear change a couple months ago and they did not put friction modifier in. My diff on tight turns was fighting me!!!! Hope the additive helps.

Again, Thanks for the help. This is a great forum.

 

[Kirkinsb]

Added the Mopar friction modifier....and my diff seems happy again. So that is good!