newblue92

When I put my XJ into reverse and back up there a sudden loud droning/whining sound. Is it the rear brakes? Sounds like it but I can't tell.
When I go forward it never happens.
Thanks...

freegdr

stick or auto matic

dukie564

whining is pretty normal in reverse especially if you have a manual. I suggest you back up slower.

newblue92

It's an automatic 6 cyl.
Even when I back up slowly it happens.

dukie564

does it happen only when the truck is moving? or does it happen in reverse and with foot on the brakes also?

newblue92

Happens only when moving. When stopped and foot is on the brake, nothing.
Take my foot off the brake and go slow in reverse, there's the horrible sound.
All gears are fine except reverse.

dukie564

is it more of a grinding sound? It's likely is your rear brakes dragging - they may have been improperly installed.

radio flyer

All gears are fine except reverse.

Sounds like you answered your own question !

captainofiron

reverse uses a straight cut gear, which produces a whine, while most gears nowadays are helical cut, which cuts down on whine

helicals are weaker, but i guess people really dont like the whine

I have a Muncie M-20 with 1st through 3rd have straight cut out of a M-22

sounds intense

newblue92

Sounded like it was coming from a rear brake.
Checked them out and the brake pads and everything look old as hell.
Still a little brake pad left and no leaking that I can see.
I think one of them is locking up in reverse.
It's a grinding high sort of whine. We'll see.