Changing to Redline 70W140 this afternoon but can not find a gasket on Summit or Fel Pro or anywhere. Does everyone go back with RTV? I got on thier site and saw a new product- usually used Black RTV before but this looks promising, anyone used this yet? "Permatex® Gear Oil RTV Sealant OEM specified. Specially formulated to withstand the harsh gear oil environment found in differentials and transfer cases. Because gear oil has friction modifiers that break down normal RTV and cause leaking, this specialty silicone has been tested to OEM specifications to ensure complete sealing. As a gasket maker it seeks and seals leak paths that cut gaskets cannot."
Here is what I use on all of my diffs. http://completeoffroad.com/i-128514-lube-locker-dana-60-premium-gasket.html
Sweet! This is what I was looking for. THANK YOU! Yes I know OEM used RTV and I have for years but when there is a gasket aftermarket to use I always use them, no more RTV mess, and they work better with identical thickness around the entire diff, torque it down and it is perfect.
Just a thought: Why not simply use the differential drain plug and drain the fluid, then add the requisite 5.9L. At 25,000 miles, unless you have abused it, a drain/refill should be sufficient.
I just bought the truck, going to inspect the gears and see if there is any damage or beginning of damage in the rear diff, also changing fluid to Redline 75W140 and want to clean it out of any shavings as much as possible first, get all the old crap out before filling with the good crap. With as much torque as these things have it is a good idea to inspect the gears every 20K anyways to avoid a more costly repair later, even under daily driver street use.
