75w-90 to 75-145

[frank6]

I changed out the 75w-90 to the 75-145 synthetic and put in the xl3 in. Now my diff is howling a lot more and louder. What happened? Thanks

 

[manaen]

I don't know the history of your "howl" but it sounds like there could be a mechanical problem that will not be solved with any weight of oil. There should not be any howl, wine or otherwise from your rear. Unless you have a bearing problem or a poorly installed set of gears. Check the lash and make sure the gears are installed properly...

 

[josh93rodeo]

I thought all the independent rear suspension Explorers called for 75w-140 syn? It shouldn't have had 75w-90 in it. Regardless, a rear end noise shouldn't get worse with new fluid.

 

[thepotroast]

I don't know the history of your "howl" but it sounds like there could be a mechanical problem that will not be solved with any weight of oil. There should not be any howl, wine or otherwise from your rear. Unless you have a bearing problem or a poorly installed set of gears. Check the lash and make sure the gears are installed properly...

The howl problem with 3rd gen explorers is well documented and reported on this site.

With that said, are you sure that you put the correct amount of fluid in?

 

[jrford]

do you have a LSD door code L4 or something? Or did it come with the ClassIII hitch?
If you do you have an additive to put in also. I also put in 75-140 in my rear but mine is the door code 45 which means 3.55 open diff and is not needed.

 

[manaen]

The howl problem with 3rd gen explorers is well documented and reported on this site.

With that said, are you sure that you put the correct amount of fluid in?

I'm well aware of the gen3 problems, my point was that like many gen3's he needs to address the mechanical issue not try to cover it up with thicker fluid. Hey I got it, why don't you try the old 70's trick and throw a few bananas in the rear

HAHAHA......