REAR END NOISE WHEN DECELERATION

2003 Ford Explorer

Tiny

pocolachristian

April, 24, 2010 AT 5:31 PM

Noises problem
2003 Ford Explorer 6 cyl Two Wheel Drive Automatic 135000 miles

Hi, I noticed when I hit about 40mph and let off gas and coast do a stop I hear rear end noise like a howling/grinding. I can even feel it in steering wheel sometimes. I heard something about pinion bearing preload set has loosened. I had it replaced about one month ago. I was making howling noise around 60-70mph. Now thats gone and doing this. Any ideas. Please help.

FOUND 260 RELATED QUESTIONS

5 Answers

Tiny

merlin2021

April, 24, 2010 AT 5:44 PM

There is a tech bulletin about this and also rear hub bearings This is the rear end bulletin: REAR AXLE NOISE REPAIR TECHNICAL SERVICE BULLETIN Reference Number(s): 05-23-3, Date of Issue: November 28, 2005 Superceded Bulletin(s): 05-12-6, Date of Issue: June 27, 2005 Related Ref Number(s): 05-12-6, 05-23-3, 05-6-18 ARTICLE BEGINNING DESCRIPTION REAR AXLE NOISE REPAIR ISSUE Some vehicles may exhibit an axle whine or hum during acceleration, deceleration and/or cruise. ACTION An axle repair kit has been developed which incorporates most parts required for a comprehensive axle repair. The kit should be used instead of installing a complete axle assembly to repair an axle whine/hum. Replace Ring and Pinion with Axle Kit and Components. FORD: 1997-2005 Expedition, F-150; 2002-2005 Explorer LINCOLN: 1998-2005 Navigator; 2003-2005 Aviator MERCURY: 2002-2005 Mountaineer NOTE: This article supersedes TSB 05-12-6 to update the Service Kit and Service Procedure information. NOTE: REFER TO THE " DIFFERENTIAL RING AND PINION" IN-VEHICLE REPAIR PROCEDURE IN THE ONLINE WORKSHOP MANUAL SECTION 205-00, FOR THE LATEST AXLE DIAGNOSIS AND REPAIR PROCEDURES. NOTE: FOR 1999 AND PRIOR MODEL YEAR VEHICLES, USE THE 2000 MODEL YEAR WORKSHOP MANUAL. NOTE: WHEN SERVICING THE REAR AXLE ON ANY 2002-2004 F-150, EXPEDITION, NAVIGATOR, EXPLORER OR MOUNTAINEER BUILT BEFORE 3/30/2004, IF FLUID REPLACEMENT IS REQUIRED, REPLACE THE ORIGINAL FUEL EFFICIENT HIGH PERFORMANCE (FEHP) SAE 75W-90 REAR AXLE LUBRICANT WITH SAE 75W-140 HIGH PERFORMANCE SYNTHETIC REAR AXLE LUBRICANT. WHEN THE FLUID TYPE IS CHANGED, REPLACE THE CURRENT " FEHP" METAL TAG WITH A NEW " 75W-140" TAG (F3TZ-4121-AA). IN ADDITION, REMOVE OR BLOCK-OUT THE FEHP REFERENCE ON THE MULTI- Page 1 of 3
KIT ORDERING: REFER TO THE VEHICLE AXLE TAG FOR AXLE RATIO IDENTIFICATION 5L3Z-4209-A = (8.8-Inch Ring Gear/3.31 ratio) (1997-2005 F-150) 5L3Z-4209-B = (8.8-Inch Ring Gear/3.55 ratio) (1997-2005 F-150, 2002-2005 Explorer/Mountaineer/Aviator) 5L3Z-4209-C = (8.8-Inch Ring Gear/3.73 ratio) (1997-2005 F-150, 2002-2005 Explorer/Mountaineer/Aviator, 2003-2004 Expedition/Navigator) 5L3Z-4209-D = (9.75-Inch Ring Gear/3.31 ratio) (1997-2005 F-150, 2005 Expedition/Navigator, 1997-2002 Expedition/Navigator) 5L3Z-4209-E = (9.75-Inch Ring Gear/3.55 ratio) (1997-2005 F-150, 1997-2002 Expedition/Navigator) 5L3Z-4209-F = (9.75-Inch Ring Gear/3.73 ratio) (1997-2005 F-150, 1997-2005 Expedition/Navigator) THE AXLE SERVICE KITS INCLUDE THE FOLLOWING COMPONENTS: 4630 - Head Bearing 4628 - Head Bearing Cup 4676 - Pinion Seal 386989-S2 - Washer (Slinger) 4621 - Tail Bearing 4616 - Tail Bearing Cup 4222 - Differential Bearing Cups 4221 - Differential Bearings 4209 - Gear Set (includes pinion shims, pinion nut and crush spacer) 4209 - Instruction Sheet ORDER AS NEEDED: COLORED LABEL LOCATED ON THE RIGHT SIDE AXLE TUBE. IF THE AXLE IS A LIMITED-SLIP MODEL, USE XL3 ADDITIVE FRICTION MODIFIER IN THE QUANTITY RECOMMENDED BY THE WORKSHOP MANUAL. NOTE: 9.75 REAR AXLE HOUSINGS WERE REDESIGNED IN MID-1999, INCREASING FRONT PINION BEARING SIZE. REPLACING RING & PINIONS IN AN OLD-STYLE AXLE ASSEMBLY WILL REQUIRE INSTALLATION OF SPACER P/N YL3Z-4662-CA. SPACER IS TO BE INSTALLED BETWEEN INNER PINION BEARING AND COLLAPSIBLE SPACER. NOTE: THE KIT DOES NOT INCLUDE THE FOLLOWING ITEMS. SOME OR ALL OF THESE ITEMS WILL BE REQUIRED TO COMPLETE THE AXLE SERVICE, DEPENDING ON AXLE APPLICATION/STYLE. YL3Z-4662-CA - Pinion Bearing Spacer for 1997-1998 9.75 axles XG-14 - Gear Marking Compound 4067 - Differential Shims 0.241" to 0.307" SAE XY-75W140-QL - High Performance Synthetic Rear Axle Lubricant XL-3 - Additive Friction Modifier (Limited Slip Axles Only) 205-506 - Seal Protectors (Rotunda Tool) W710084-S439 - Wheel End Nuts 390266-S100 - Differential Slave Pin Bolt (9.75" axles) 387426-S100 - Differential Slave Pin Bolt (8.8" axles) 4B422 - Axle Circlips ZC-21 - Metal Surface Cleaner TA-29 - Ultra Silicone Sealant TA-27 - Stud and Bearing Mount Retaining Compound and Sealer F3TZ-4121-AA - Fluid Tag (REQUIRED IF FLUID TYPE IS CHANGED FROM FEHP DURING REPAIR) WARRANTY INFORMATION WARRANTY STATUS: Eligible Under Provisions Of New Vehicle Limited Warranty Coverage. NOTE: REUSE OF RING GEAR BOLTS, CARRIER BEARING CAP BOLTS AND DIFFERENTIAL SLAVE PIN RETAINING BOLT REQUIRES CLEANING OF THREADS AND INSTALLATION OF TA-27 STUD AND BEARING MOUNT RETAINING COMPOUND & SEALANT.
4/24/2010 .
Growling noises can also be from the rear wheel hub bearings.

Tiny

pocolachristian

April, 24, 2010 AT 8:34 PM

So would you say it would be a wheel bearing since I just got new pinion put in. The noise didn't start until after pinion repair. Also would wrong diff oil cause that noise

Tiny

merlin2021

April, 25, 2010 AT 7:53 AM

The wrong oil? Meaning not gear oil 85-90 wt.
If you mean they used engine oil then yes it could contribute to early part failure. I would say to put it on a lift, spin the rear wheels, any roughness in the hub bearing could be felt.

Tiny

pocolachristian

April, 25, 2010 AT 5:55 PM

I meant wrong weight of gear oil. Anyway I crawled under explorer and with it in park and grabbed where the driveshaft flange fits on pinion flange. I could move that back and forth about a half inch each way. I don't know if that is supposed to have play in it or your not supposed to be able to turn that at all. Thank You.

Tiny

merlin2021

April, 26, 2010 AT 2:33 AM

Should not have that much play. Were new parts used?
Crush spacer isn't working.

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