🚗 Fel Pro Rear Main Seal for Chevrolet 40640 Review

This is a FelPro seal, nothing more nothing less. So if it's not damaged in any way, it works fine and is the right size and shape for your application. Just a word of warning. Change the stupid backplate when you make that gasket because sometimes it's not a gasket and you won't know until you put it back together! Plates are only $100 and that saves a lot of extra work!

Used on a 1999 Silverado 5.3L Gen 3rd LS. Fit and functionality were top notch. Now is not the time to save work or hack. If you don't like pulling on gears, I highly recommend using a cap alignment tool, otherwise you will most likely cause premature crank seal leakage at some point or all at once. through contradiction! Also remember that the seal must be mounted "this side out", towards trance you will find a small text on the edge of the seal.

So I bought this to fix the rear mainshaft oil seal. I originally received a kit with this copper/aluminum gasket with black silicone as shown in the photos. I had to return this set as the seal was broken. They sent me another bs40640 kit, also branded fel-pro. However, it was a steel gasket with blue silicone. Disappointed because I didn't know if these parts were original, I went to the dealer to buy them. They wanted $80 for the gasket alone and it looked EXACTLY copper/aluminum with black…

I replaced this seal during a transmission overhaul. The truck runs, the Simmerring works great. Installation can be a bit confusing for people who have never used it. The sealing lip is different from the traditional rubber seal, and the seal is narrower than the original seal. Make sure the small thin lip (dust seal) faces away from the motor towards the gearbox. Also, the entire gasket is made of rubber or looks almost like graphite material and not steel. So you have to make sure that it…

Used on a 1999 Silverado 5.3L Gen 3rd LS. Fit and functionality were top notch. Now is not the time to save or hack work. If you don't like pulling on gears, I highly recommend using a cap alignment tool, otherwise you'll likely end up with a premature crank seal leak eventually or immediately. through contradiction! Also remember that the seal must be mounted "this side out", towards trance you will find a small text on the edge of the seal.

So I bought this to fix the rear main seal. I originally received a kit with this copper/aluminum gasket with black silicone as shown in the photos. I had to return this set as the seal was broken. They sent me another bs40640 kit, also branded fel-pro. However, it was a steel gasket with blue silicone. Disappointed because I didn't know if these parts were original, I went to the dealer to buy them. They wanted $80 for the gasket alone and it looked EXACTLY copper/aluminum with black silicone.

Media failed to load. I renewed this seal during the gearbox overhaul. The truck runs, the Simmerring works great. Installation can be a bit confusing for people who have never used it. The sealing lip is different from the traditional rubber seal, and the seal is narrower than the original seal. Make sure the small, thin lip (dust seal) is facing away from the engine toward the gearbox. Also, the entire gasket is made of rubber or something almost like graphite, not steel, so you have to be…