2003 Ford Explorer rear end noise when deceleration

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REAR AXLE NOISE REPAIR TECHNICAL SERVICE BULLETIN Reference Number(s): 05-23-3, Date of Issue:  November 28, 2005 Superceded Bulletin(s): 05-12-6, Date of Issue:  June 27, 2005 Related Ref Number(s): 05-12-6, 05-23-3, 05-6-18 ARTICLE BEGINNING DESCRIPTION REAR AXLE NOISE REPAIR ISSUE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 http://www.ondemand5.com/mric/common/asp/Article.aspx?MOD=TSBART&YEAR=20 ...
Growling noises can also be from the rear wheel hub bearings.

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

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.

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.

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