Permatex 81182 Gear Oil RTV Gasket Maker, 3 oz (Packaging May Vary)

When you work on your differential, you must decide three things: gasket or no gasket, RTV or no RTV and which RTV is best? My preference is to first stick the gasket to the cover with a small bead of this RTV. Then, apply a small bead of this RTV to the differential housing. This way prevents an accidental transfer of RTV from the cover to the ring gear if the cover touches the gear. Using only the socket and your hand, tighten the bolts in a crisscrossing star pattern until they are as tight as you can get them. The RTV package says let it cure for 1 hour, so let it cure for 1 hour. Then, using a torque wrench, slowly increase the bolt torques using the star pattern until all bolts are properly torqued. Let it cure for 23 hours before introducing the gear oil. Following this approach, I have never had a leak. Nice product. Does what it says, but you must follow the instructions.

I've been using this exact product in all of my front and rear differentials. The manufacturer says this product is specifically made for differentials and in dealing with the differential oil characteristics. I've never had a leak or any issue with this product. I believe in the manufacturer's hype. My friend uses the Permatex "Red" gasket maker with great success but given enough time and or mileage the "Red" gasket maker will leak in a differential application whereas the "Green" gasket maker does not leak. I recommend this product for this application.

Used this sealant on the rear diff cover on my '21 F-250. It sealed just fine but I would rather have a gasket.

This was the recommended gasket material for resealing my rear differential on my 2019 Ford F150 after fluid change. Did the change about 4 months ago and no leaks. Good stuff.

Works as it should!👍

Stiff to expel from tube, does good job sealing.

Essential for differential covers that use RTV. Holds up great to the additives in gear oil with no leaking. Just make sure you follow the instruction fully and let it cure for the full amount of time before adding new fluid.

Good stuff!