FEL-PRO BS 40640 Engine Crankshaft Seal Kit for Chevrolet Silverado 1500

Great gasket set. Be sure to get the cover alignment tool! Made the job a breeze and had zero leaks.

I chose this over a lot of other cheap, generic aftermarket rear main seals and gaskets. It's also mainly the rear main seal that's the most important, aside from the rear main cover gasket. I've seen a lot of the really cheap aftermarket rear main seals leak, so I wasn't going to take a chance; especially not after dropping my whole transmission and really not wanting to have to do that again in the next 10-20k miles (or maybe even less!).I did have a separate OEM GM LS rear main seal that I used, but this Fel-pro one is just as good, in my personal opinion. The cheap ones are sometimes a bit smaller in size, and the rubber material isn't as durable, which causes leaks as it gets heat-cycled.I also bought a billet aluminum rear main cover alignment tool, to center the rear main cover for installation (along with the new cover gasket), before using it to install the new rear main seal cover. I guess it's more exact to install using the alignment tool, but I've done it in the past with the rear main seal installed BEFORE re-installing the rear main cover, and I was still fine.Lastly, you'll also want to make sure to clean all the surfaces to the mating surfaces, including the oil pan gasket portion that the rear main cover sits on. I personally used Permatex ultra black RTV gasket maker, which is oil safe. The ultra gray version works as well, but I'm sure any high temp and oil-resistant RTV gasket maker, should do the trick just fine.

3 time repeat customer. Rear main is too much of a pain to use something cheap you don’t trust. The seal is made a little different than the original, thinner and presses in very easily. I was initially worried it wouldn’t stay put. It has been about a year since the first one and still leak free, have used twice since then, no leaks from any. Will use again. I put them in dry, and eyeball them making sure lip is even around the crank flange. I haven’t used an alignment tool on any.

I purchased 2 different seals because they were cheaper but I end up dropping the transmission 3 times because none of them work, this one works perfectly, 4 months already and no leaks.

Can’t go wrong here, fit good and no leaks. Also I didn’t use an alignment tool. If you inspect the seal all around the crank and make sure the spacing is even you’ll be fine. Takes a close eye and flashlight to see it. Use the oil pan bolts to adjust up and down and torque those last.

The only thing that worries me is how easy the seal slipped into the rear main housing. Fit snug around the crankshaft but it just seemed to easy going into the aluminum housing. I modified it so it won’t back out. I hope. Doing a 4/4 transmission R&I is not for the novice wrencher. About 3k later and not a drip of oil.

Bought a used motor and seeing how vortechs are notorious for leaking rear seal on back of motor, I got this to replace so I won't have that issue. So far it is doing what it is suppose to. Was a real good buy

The media could not be loaded. I replaced this seal while I was doing a transmission overhaul. The truck is up and going and the seal is working great. The install can be a little confusing for people who haven't used these before. The lip of the seal is different than a traditional rubber seal and the seal is narrower than the origional seal. Ensure the small thin lip (dust seal is facing it away from the engine and towards the transmission. Also the entire seal is rubber or almost what seems like a graphite material instead of steel so you need to use care to not deform it during pressing in, however, being all rubber it presses in easier than the traditional steel seals. Just make sure you get it all the way down and flat in it's bore; use the install tool while you're pressing it into the housing and while installing the housing/seal into the engine to keep from distorting it. One more important thing to mention, and its hard to wrap your head around this as it goes against conventional seal installation practices is: You do NOT...i repeat do NOT use oil on this seal or it's mating surface. Like I said this seal is a harder rubbery material maybe impregnated with graphite? If you do use oil I hear they will leak for sure. I have installed many of these (PTFE I believe is the the material,) mostly on Cummins diesels and never used oil and never had a leak. They come with a grease for vacuum testing purposes, I wipe that off, just make sure you don't leave any lint on it. Research it. PTFE.