Truck makes a load "grinding" type noise while accelerating or while under stress

Have the differential checked. It may be a failing pinion bearing

Roy

THIS IS 2 OF MY EXPERIENCES

THE 1ST IS THE OTHER END OF THE DRIVE SHAFT--OUTCOME WOULD BE THE SAME.....SEE January 09, 2012, IN THIS LINK

https://www.2carpros.com/questions/1992-ford-crown-victoria-aod-transmission-time-shift-2nd-gear-roughly-30mph-locks

THE ABOVE ISSUE WAS NOT A TRAUMATIC AS THE ONE I'M SENDING YOU BELOW......I ONLY CRIED WHEN NO ONE WAS LOOKIN'

SOME OF THE PUNCTUATION DID NOT COME THRU WELL WHEN OUR SITE WAS REMODELED...I THINK YOU'LL GET THE DRIFT...ESPECIALLY ON THE INCONVENIENCE PART

https://www.2carpros.com/questions/jeep-grand-cherokee-1997-jeep-grand-cherokee--2

HERE'S SORTA WHAT NEEDS TO BE DONE......START AT ABOUT June 28, 2012THIS IS NOT YOUR VEHICLE, BUT A DIFFERENTIAL ON MOST VEHICLES HAVE THE SAME BASIC WORKINGSHE'S GOING AGAIN BY August 11, 2012

https://www.2carpros.com/questions/1985-jeep-cj7-inconsistent-curb-idle-low-power-hi-rpms

YOUR TURN

THE MEDIC

LETS CHECK THIS TOO

ON MY JEEPS.....HAVE 2 NOW, 5 OTHERS IN THE PAST....NOTHING ELSE SINCE I STARTED DRIVING IN 1981

.....THE OLE "U-JOINTS" SQUEAK (LIKE AN UN-OILED TRICYCLE) WHEN YOU LET OFF OF THE GAS....WHEN THEY START GOING BAD

UNDER POWER, YOU DON'T HEAR 'EM UNLESS THEY ARE ABOUT TO FALL APART....WHICH I DON'T LET HAPPEN

ANYTIME I HAPPEN TO BE UNDERNEATH....OUTTA HABIT I CHECK 'EM

THIS LINK I GIVE YOU NOW MAY HELP YOU FOREVER

https://www.2carpros.com/questions/2007-ford-taurus-tune-up

CHECKING THE U-JOINTS IS DEMONSTRATED IN MY PICS OF "WILLY" AT THE BOTTOM

I HOPE YOU CAN UNDERSTAND MY "RURAL METHODS" OF ANSWERING QUESTIONS.....I WILL CONTINUE TO AID YOU IN ANY WAY I CAN....JUST KEEP ON A ASKIN'........AS YOU CAN SEE I'M MORE IN TUNE WITH THE JEEPS AND OLDER CARB VEHICLES.

DO YOU RECKON IF YOUR PAL LAID DOWN IN THE BED WITH HIS HEAD OVER THE END...HE MIGHT BE ABLE TO HEAR THE NOISE IF IT WAS THE DIFF OR THE WHEEL BEARING....ABLE TO HEAR EXACTLY WHERE THE NOISE IS ORIGINATING FROM?

....JUST DON'T LAUNCH HIM OUT THE BACK!

DID THE "DRIFTIN" STORY BRING OUT A TEAR?

THE MEDIC

"SERVICE ENGINE" IS COMPUTER RELATED....COMPUTER IS TELLING YOU THERE IS A PROBLEM, THE MANY SENSORS THAT MONITOR THE ENGINE AND SOME OTHER ITEMS ARE "PICKING UP" AN ABNORMALITY.

THE U-JOINTS, DIFFS ARE NOT "MONITORED", NOR ARE WHEEL BEARINGS AND A BUNCH OF OTHER STUFF IN THE LATE '80s AND THRU ABOUT '95 (OBD I)

OBD II BEGAN ABOUT '96 AND IS STILL BEING USED (THIS IS THE TYPES OF COMPUTER SET UPS SORTA TRYING TO GET ALL OF THE AUTO MAKERS ON THE SAME SHEET OF MUSIC)

OBD I IS SORTA PRIMITIVE......BOTH SYSTEMS GIVE "CODES".....OBD I CAN SOMETIMES BE ACCESSED WITH A PAPERCLIP SHOVED IN A TEST PLUG AND EITHER A SPECIFIC SET OF BLINKS OF THE CHECK ENGINE LIGHT----OR EVEN WATCHING "NEEDLE SWEEPS" ON A ANALOG (OLD STYLE) VOLTMETER WILL SORTA "MORSE CODE" YOU THE CODES----EXAMPLE 2 LASHES--A SPACE--5 FLASHES = "CODE 25"

IT'S A BIT HARDER THAN THAT, AS SOMETIMES (DUMB EXAMPLE) IT WILL BLINK OUT 6 FLASHES (# OF CYLINDERS) THEN THE "2 AND 5"---SOME OTHER WILD #---REPEAT THE "2 AND 5"---THEN A MANUFACTURER CODE.........NOT KNOWING ALL OF THIS, I HAVE TO USE A BOOK--ALL OF THE PREVIOUS WAS "FICTITIOUS"....BUT IT HAS A SEQUENCE, TAKES A WHILE TO PROPERLY UNDERSTAND AND IS CONFUSING.......MANY TIMES THE FLASH SPACING (SOME OBD I READERS "BEEP") REALLY CONFUSE YOU, YOU THINK IT'S DONE OR ONE SPACE IS LONGER THAN THE OTHER.....GET MY DRIFT?

MOST PARTS STORES AROUND HERE CAN SCAN "OBD II"....NO PROBLEM...FOR FREE!

OUR LOCAL "AUTOZONE" HAS BOTH SCANNERS---WHICH ACTUALLY JUST "TELL YOU THE CODE".....NO FLASHES OR BEEPS, JUST SPITS OUT THE NUMBERS.....AGAIN, THEY SCAN IT FOR FREE AROUND HERE

(CALL AROUND, SEE WHO CAN CHECK OBD I, INSURE THEY KNOW YOU MEAN "OBD I"....NOT II !!!!)

"SMALLER PAY SHOPS"---CAPABLE OF OBD I OR II---AROUND HERE, WILL SCAN AND TELL YOU THE CODES FROM $25--$75

THIS IS THE MOST IMPORTANT PART! READ THIS LINK

https://www.2carpros.com/questions/2008-mazda-6-recently-check-engine-light-came-on-acts-doesn-t-want-start-put-gas

IF YOU FIND YOU CANNOT GET THIS DONE FOR FREE---LET ME KNOW--I MAY CAN SEND YOU SOME INFO, THAT MAY HELP

LET'S DO THIS 1ST, THEN WE MIGHT FIGURE OUT IF SOME OF YOUR RACKET IS RELATED TO THE COMPUTER

WHAT ABOUT THE "JIM-BOB" PEERING UNDER THE TAILGATE TEST?????

GOT YOUR REPAIR MANUAL YET?

READY TO DO A "CATCH UP" TUNE UP?

THE MEDIC

RECKON THE WHISTLE IS AT THE THOTTLE BODY. MY CARB WHISTLES AT A CERTAIN OPENING. IT'S JUST BELOW IDLE SPEED---IN OTHER WORDS IF IDLE SET TOO LOW, IT DOES IT. WHEN I GET IT TO THE CORRECT IDLE SPEED IT DISAPPEARS

DO NOT MESS WITH YOUR IDLE!

COULD BE THE AIR CLEANER OR IT'S DUCTING

YOU ARE REALLY GONNA HAVE TO PIN DOWN THE AREA IT IS COMING FROM

LONG AS YOU TRY.I DO WHAT I CAN!

SAME GOES FOR THE JEEP CJ GUYS THAT I HOOK UP WITH.I'LL PROVIDE TOOLS, THE DRILL SERGEANT TREATMENT, AND A LITTLE "MONKEY SEE-MONKEY DO". THEY DO THE WORK, PROVIDE THE PARTS, ASK THE STUPID QUESTIONS. IN THE END. THEY KNOW SOME STUFF. CAN DO SOME STUFF ALL BY "THEIR-SELF" (S.C. LINGO) LATER ON!

HAVIN' FUN YET?

THE MEDIC

ROGER ON THE POSSIBLE FIXES

IF YOUR DIFF BEARINGS ARE OKAY---NEED TO GET THAT PINION SEAL CHANGED.

DEFINITELY NEED TO CHECK THE GEAR JUICE LEVEL IN THE DIFF CHECKED AND TOPPED BACK OFF.......EVEN IF YOU PUT OFF THE SEAL CHANGE. THE GEARS WITHIN STILL NEED LUBRICATION...SLOWLY LEAKING OUT OR NOT!

YOU NEED TO GET THE REPAIR MANUAL AND SLLLOOOWWWWLLLYYY LOOK THRU THE BEGINNING OF IT. IT'LL TELL YOU WHAT TO CHECK AND HOW TO CHECK....STUFF YOU DIDN'T EVEN KNOW NEEDED CHECKIN'!

IT EVEN HAS A/ OR SEVERAL TROUBLESHOOTING SECTIONS IN IT....LIKE "TRUCK SHIMMYS"--"BRAKE PEDAL PULSATES"---THAT'S JUST A GLIMPSE OF WHAT'S IN THERE!

http://shop.advanceautoparts.com/webapp/wcs/stores/servlet/product_chevrolet-gmc-pu-'88-'98-chilton_6060031-p?searchTerm=repair+manual+-+vehicle

SOMETIMES IT'S GOOD TO HAVE TWO (OR 10!), ONE FROM ANOTHER COMPANY--MAY HAVE BETTER PICS AND DIAGRAMS THAN THE OTHER...AND VISA-VERSA

http://shop.advanceautoparts.com/webapp/wcs/stores/servlet/product_chevrolet-and-gmc-pickup-'88-'98-repair-manual-haynes_6060196-p?searchTerm=repair+manual+-+vehicle

YOU SHOULDA GOT A JEEP....YOU'D BE REALLY HAPPY RIGHT NOW!

KEEP ME POSTED...I WANNA KNOW HOW FAR YOU'VE PROGRESSED IN YOUR NEW MANUAL

THE MEDIC

AIRBORNE!

THE MEDIC

WHOOO-AHH!

IT'S VERY EZ

. ALL YOU GOTTA DO

. IS "HANG"

. DON'T QUIT

. WHILE YOU WATCH THE OTHER 70% DO SO

WANNA SEE MY MAN CAVE.A FEW CANDID SHOTS

SO WHAT'S YOUR PROGRESS SO FAR?

THE MEDIC