Humming noise

Very hard to say which way to go with out hearing the noise first hand, although I doubt that removing the box will be advisable at this stage, does this noise correspond with engine speed or road speed predominately?

When its making the noise see if turning the wheel has an affect on the sound.

I would suggest running it on a lift and listen to the front and back of the transmission and try to isolate the noise

There is a tool called an engine ear that you can attach leads to different parts of the drive train and listen to diferent parts of the drive train @55

Transmision problem?

HAVE YOU GOT UNDER THERE AND REALLY CHECKED THINGS OUT GOOD?

IN THE FOLLOWING LINK....EVEN THE SLIGHTEST BIT OF SLOP COULD CAUSE SOUNDS AND LATER VIBRATIONS

https://www.2carpros.com/questions/1996-ford-ranger-96-weird-crackling-sound-30mph

SEEMS THAT WITH MANY "SHOP DIAGNOSIS'" NOW DAYS, "RAPING A ONE TIME CUSTOMER'S BANK ACCOUNT" IS THE KEY WAY "KEEP THEIR SHOP GOING"

CASE IN POINT, LADY THAT COMES INTO THE RESTAURANT MY WIFE MANAGES, SHE HAD BEEN TO A LOCAL "TRANNY OFFENDER'S SHOP" (THEIR NATIONAL NAME IS POPULAR ANYWAY). THE LADY WAS IN TEARS BECAUSE THEY WANTED ABOUT $3000 TO REBUILD HER NOISY, ALMOST "TERMINAL" TRANNY. SHE EXPLAINED THE NOISE STARTED THE DAY BEFORE AND WAS NOT AS BAD TODAY.....BUT STILL WAS THERE

MY WIFE SUGGESTED TO HER THAT SHE HAVE "ME", AT LEAST LOOK AT IT OR MAKE OTHER SUGGESTIONS BEFORE SHE "GAVE IN"

AFTER I GOT OFF OF WORK (PLUMBER), SHE WAS AT MY HOUSE, I GOT AT LEAST AN HOUR OF NERVOUS, EXCITED, AND WORRIED JABBER IN MY EAR, OF HER TAKE ON THE SITUATION.....BEFORE I COULD EVEN LOOK AT IT!

UPON HER INSISTENCE, SHE DROVE ME AROUND FOR ABOUT 20 MINUTES, AND AFTER 2 STOPS AND LOOKING AROUND UNDER HER CAR. I TOLD HER I COULD REPAIR IT FOR $1000. SHE WAS GRATEFUL AND WENT BACK TO MY HOUSE. THEN SHE STARTED TO SET UP A TIME TO DO IT....AS WE SAT IN MY DRIVEWAY

I TOLD HER I COULD DO IT NOW, AND I WOULD KNOCK OFF AN ADDITIONAL $500 IF SHE WOULD HELP. (SHE HAD NEVER HAD SUCH AN OFFER)

I HAD THE GAL LIFT HER CAR WITH MY FLOOR JACK, I PLACED 2 JACK STANDS UNDER THE REAR AXLE

AS SHE STOOPED DOWN TO ASK WHERE, AND SEE WHAT THE PROBLEM WAS, I HAD MY POCKET KNIFE OUT

...........CUTTING A PLASTIC SHOPPING BAG OUT FROM AROUND THE REAR OF THE TRANSMISSION AND WOUND UP ALL IN THE DRIVESHAFT'S FRONT U-JOINT

........OF COURSE I CHARGED HER NOTHING!, THE WORST PART OF THE DEAL WAS LISTENING TO THE "WHAT IFs" AND "WHINING" BEFORE I TOUCHED IT!!!

I DO HAVE A PRETTY GOOD REPUTATION AT THE RESTAURANT NOW....SEEMS I CAN DO IT ALL!

MORAL OF THE STORYSHOPS "WILL" "GET YOU" SOMETIMES (I DOUBT THEY EVEN LOOKED AT IT, SHE SAID THEY HAD DRIVEN IT FOR 5 MINUTES)

MY PROVERB: "NOBODY CARES ABOUT MY STUFF, AS MUCH AS I DO"

GET ALL THE FREE HANDS ON HELP YOU CAN (TO INCLUDE YOUR OWN) BEFORE A SHOP COMES INTO PLAY (AS YOU SEE, THEY ARE NOT ALL BAD, BUT THERE ARE SOME OUT THERE!)..........DRIVE OVER A SHOPPING BAG LATELY???

I'D GET SEVERAL OPINIONS BEFORE I COMMITTED TO JUST ONE

HERE'S ANOTHER LINK

https://www.2carpros.com/questions/1999-infiniti-q45-replace-rear-o2-sensor

THE MEDIC