I am planning on changing differential gear oil to synthetic, I am also contemplating installing mag-hytek cover,does anyone have any experience with this product.My truck is a 01,3500 CTD Thanks in advance .....Mike

 

I personally do not have one, but I have helped put one on. It's slick! I want them for mine too. Absolutely a great investment.<br><br>Dave

 

It will be one of the best investments you can make for the rear axle anyway. I put one on mine before the truck was a year old. If I remember right, the rear end holds near eight quarts now. Plus it looks really cool and several people see the two speed rear end switch I use for the Jacobs cut out and the cover and ask me if I have installed a two speed rear end.<br>Just make sure the sealing surface on the axle is clean and dry and don't over tighten the new bolts. The new cover uses an o-ring for a seal. Mine has not leaked a drop in over three years. I used the big A with no friction modifier.<br>Good luck.

 

Ditto what DD4x4 said. I used a wire brush on the end of drill to clean off all the gasket sealer. Just place a towel over the innards and go to town. Only took a couple minutes and it does a great job and you don't have to worry about marring the sealing surface. Not sure on the 80's but my 70 had a number stamped in the seal area and just a dab of silicone wiped into the stamp (per the maghytec instrtuction sheet) has worked great for 40k now on the rear. Also used the big A with no modifier.

 

Mag-Hytec cover is well worth it! I have the front &amp; rear diff covers and the double deep tranny pan.... ;D<br><br>Tony