So I have a 73' AMC CJ-5 and we recently had a new differential and locker installed into the rear axle. Not even 1000 miles has been put onto these parts and already a failure? As our mechanic has explained it to us water has gotten into the rear differential and rusted the locker to the point where its stuck 'on' and the water has worn the differential wrong and now it has to be replaced. I know there is a vent on top of the axle but isn't it just a one way port? Any thoughts, concerns, advice on how to fix the water proofing problem is greatly appreciated.
Also our gas tank has been dropped three times due to water and mud leaking in? I'm not exactly sure as to how this is possible. I do enjoy the occasional mud run when it rains in Arizona but I have never been in water deeper than 3/4 of the way up the tire. Slightly perplexing to me on how all this water is getting into everything...Again any thoughts, concerns, or advice is welcome.
And as I am new to this forum sorry if this is a re-post.