2001 Ford F-250 popping noise in rear

JACOBSTRAUSER

MEMBER
2001 FORD F-250
7.3L
V8
TURBO
4WD
AUTOMATIC
233,000 MILES

While taking sharp turns at no acceleration and low speed I can hear a loud popping noise from the rear, I think it is the drivers side or underneath in the differential. My truck is full time posi and I noticed my posi tightened and now at low speeds it starts skidding the tires. We did a burnout and the posi works fine. I'm concerned about the popping noise. At first I thought broken leafspring getting caught and smacking against metal. But leafs are fine. O was reading online and some people said low on freeze in my rear differential. If so easy fix. I just want an opinion on what it could be before I start troubleshooting and trying to fix it, any help is appreciated

1 Reply

CJ MEDEVAC

MECHANIC
11,005 POSTS

I LOOKED UP THE SERVICE INTERVAL AND SPECS ON YOUR TRUCK

INTERVAL FOR FLUID CHANGE IN AXLES

SEVERE DUTY EVERY 50,000 MILES

REGULAR DUTY EVERY 150,000 MILES

CAPACITY 2.8 LITERS

FLUID TYPE SAE 90 PREMIUM REAR AXLE LUBRICANT C2AZ-19580-F,.,.,.,.,.,.,.,.,SPEC: ESW-M2C105-A

I DO NOT KNOW/ COULD NOT FIND OUT WHETHER THIS AXLE USES POSITIVE TRACTION LIMITED SLIP GEAR OIL ADDITIVE

IT MAY BE THAT IT IS INCORPORATED IN THE FLUID ALREADY, IF IT IS NOT IN YOUR LITERATURE (OWNER'S MANUAL/ DECALS UNDER THE HOOD) CALL THE DEALER FOR VERIFICATION WHETHER IT NEEDS TO BE ADDED OR NOT

I DID GRAB A LINK TO THE TYPE ADDITIVE, IN QUESTION, THAT I AM TALKING ABOUT

http://shop.advanceautoparts.com/p/k-w-chemical-trans-x-posi-trac-limited-slip-gear-oil-additive-7-oz.-402508/7070977-P?searchTerm=limited+slip+additive

IF YOUR DIFF HAS CLUTCH PACKS, IT PROBABLY USES THIS TYPE OF ADDITIVE

WHAT CAUGHT MY EYE ON THIS WHOLE DEAL WAS THE TURNING AND POPPING YOU HAVE AS A SYMPTOM

LIMITED SLIP, SORTA MEANING IT'S GONNA ACT LIKE FULL POSI GOING MOSTLY STRAIGHT, BUT IN A TURN IT WILL ALLOW THE OTHER WHEEL TO ROLL INSTEAD OF DRAG (OPERATE LIKE A STANDARD DIFF)

SELDOM DO YOU MAKE EXTREME TURNS, THE CLUTCH PACKS SORTA GO DRY IN BETWEEN THE DISCS, THEY NEED LUBRICATING, FURTHER IN MY ANSWER YOU WILL SEE HOW TO THIS IS DONE WITH JEEP CJs

BEING A JEEP CJ KINDA GUY AND HAVING HAD A LIMITED SLIP DIFF IN 2 OF MY PREVIOUS '70s/ '80s BABIES AND AIDING OTHER JEEP GUYS, I HAVE EXPERIENCED THE SAME SYMPTOMS

(YOU KNOW, JEEP WROTE THE BOOK ON FOUR WHEEL DRIVE!)

SEE MY LINK BELOW ON THE FIX FOR THIS ISSUE (SAVING ME A BUNCH OF PECKING)/ REMEMBER THIS WAS POSTED TO A DIFFERENT VEHICLE. I HAVE POSTED THIS TO OTHERS IN WHICH THEY RETURNED WITH POSITIVE RESULTS (DURING MY SEARCH OF OLD POSTS I COULDN'T FIND ONE TO LINK TO YOU)

https://www.2carpros.com/questions/2002-chevrolet-silverado-rear-diff-question

SO, IF YOU ARE CAUGHT UP ON FLUID MAINTENANCE, HAVE THE CORRECT GOODIES SLOSHING AROUND IN THERE, THE TIGHT FIGURE 8s AIN'T GONNA HURT A THING!

KEEP US POSTED ON HOW IT'S GOING

THE MEDIC

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