Black Permatex is what I use at work on engine blocks, oil pans, and diffs. It’s good stuff.
Front differential leak
I have been noticing a small amount of clear oil dripping from under my Commander. So today I took a look underneath. It is coming from the transfer case. I tried to tightened some of the bolts holding the transfer case to the transmission? None were loose so maybe the gasket is bad? I also tightened the drain plug and it did move a little. Will wait a few days to see if fixed. Picture attached of the bottom of the transfer case. Any other suggestions?
Top of picture is front of Commander.
![Helmet Automotive tire Automotive design Bumper Automotive exterior]()
Top of picture is front of Commander.
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Ok this morning I got the jeep up on ramps and looked over the job. The front differential cover is jammed in there and connected to the mounts and it looks like a bigger job than I want to do. Especially since I have the lifetime Warrantee. So the plan now is to try some stop leak additive and see what happens. If it still leaks it's off to the stealer. It is only about 1 drip a day!
When I bought all the materials for the job at NAPA I got some interesting products.
A pouch with the 75-140 oil for easier "just squeeze" to get it in the diff.
A new (I guess) Permatex made for differentials RTV.
Picture below.
![Liquid Bottle Automotive tire Fluid Drink]()
When I bought all the materials for the job at NAPA I got some interesting products.
A pouch with the 75-140 oil for easier "just squeeze" to get it in the diff.
A new (I guess) Permatex made for differentials RTV.
Picture below.
Back on the ramps today. Drained about half of the front differential oil. Put in stop leak and topped off with 75-140 and friction modifer. Time will tell if I stopped the dripping. 
Used this product, I have been using Bars Leak products since i was a teenager in 1950's. It was recommended by a very good mechanic I knew back in the day.
Used this product, I have been using Bars Leak products since i was a teenager in 1950's. It was recommended by a very good mechanic I knew back in the day.
I'm curious to know if it works or not, in this particular situation.Back on the ramps today. Drained about half of the front differential oil. Put in stop leak and topped off with 75-140 and friction modifer. Time will tell if I stopped the dripping.
Used this product, I have been using Bars Leak products since i was a teenager in 1950's. It was recommended by a very good mechanic I knew back in the day.
I seem to be having a similar issue here. I recently got an oil change and noticed that there were drips on the ground under the car. At first I thought it was just remnants from a sloppy oil change. But I finally took a look and determined that it was the front differential leaking.
![Wheel Tire Automotive tire Automotive lighting Alloy wheel]()
I sprayed it up with some degreaser and hosed it off. It looks a bit better, but still leaking. Makes me wonder why they didnt say something to me when they were under there changing the oil?!?!?
![Helmet Automotive tire Rim Automotive lighting Automotive wheel system]()
So this is going to be added to my "Commander To Do" list!!!
I'm gonig to need to get under there and remove the rock cover / guard to get a better look at things. But can this be done with the differential up in the vehicle?? Or does everything need to be disconnected, removed and done out side of the car??
I sprayed it up with some degreaser and hosed it off. It looks a bit better, but still leaking. Makes me wonder why they didnt say something to me when they were under there changing the oil?!?!?
So this is going to be added to my "Commander To Do" list!!!
I'm gonig to need to get under there and remove the rock cover / guard to get a better look at things. But can this be done with the differential up in the vehicle?? Or does everything need to be disconnected, removed and done out side of the car??
I got my rear Speed Sensors replaced, so I'm hoping to work on this leak here next week.
As I continue to read up on this, I have another quick question. The instructions on the Permatex Black RTV sealant packaging say to finger tighten the bolts, let set for an hour, then tighten to spec and wait 24 hours to fill with fluids / return to service. I realize that's right from the Permatex packaging, but is the waiting 24 hours to fill with fluids / return to service really accurate?? I usually work on these projects at my parents garage, where my brother has all the tools, air compressor, etc. That's going to complicate things a bit if I cant drive for a full day ...
![Product Rectangle Font Screenshot Circle]()
As I continue to read up on this, I have another quick question. The instructions on the Permatex Black RTV sealant packaging say to finger tighten the bolts, let set for an hour, then tighten to spec and wait 24 hours to fill with fluids / return to service. I realize that's right from the Permatex packaging, but is the waiting 24 hours to fill with fluids / return to service really accurate?? I usually work on these projects at my parents garage, where my brother has all the tools, air compressor, etc. That's going to complicate things a bit if I cant drive for a full day ...
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