Loud noise from underneath

[Jimmyheaters]

I have a 1989 ford bronco and when I got it was making a loud noise when coming to a stop so I assumed it was my brakes because I also needed them done and I did get them done but the loud noise is still present when I am just starting to move and when I come to a stop and I am wondering what it could be

 

[miesk5]

Yo Jimmyheaters,
Welcome!
See Noise, Vibration and Harshness by Ford @ http://www.diesel-dave.com/vehic/manual/stj/stjs040l.htm

Excerpt for example;

Section 00-04: Noise, Vibration and Harshness

1996 F-150, F-250, F-350, Bronco and F-Super Duty Workshop Manual​

DIAGNOSIS AND TESTING

---

Symptom Charts​

ROAD TEST DIAGNOSIS

Condition	Possible Source	Action
Noise Is the Same on Drive or Coast	Road noise.	Vehicle OK.
	Tire noise.	INSPECT/REPLACE tires. REFER to Section 04-04.
	Front wheel bearing noise.	INSPECT/REPLACE front wheel bearings. REFER to appropriate section in Group 04 (2-wheel drive) or Group 05 (4-wheel drive).
	Differential bearings.	INSPECT differential bearings. REFER to appropriate section in Group 05.
	Pinion bearings.	INSPECT pinion bearings. REFER to appropriate section in Group 05.
Noise Changes with Type of Road Surface	Road noise.	Vehicle OK.
	Tire noise.	INSPECT/REPLACE tires. REFER to Section 04-04.
Noise Tone Lowers As Vehicle Speed Lowers	Tire noise.	INSPECT/REPLACE tires. REFER to Section 04-04.
	Driveline noise.	INSPECT driveshaft, U-joints and rear axle universal joint ******. REFER to Section 05-00. For removal of driveshaft, REFER to Section 05-01.
Similar Noise Is Produced with Vehicle Standing or Driving	Accessory noise.	PERFORM Pinpoint Test D.
	Transmission noise.	INSPECT transmission and mount. REFER to appropriate section in Group 07.
	Engine noise.	PERFORM Pinpoint Test B. PERFORM Neutral Engine Run-Up Test (NERU) and Drive Engine Run-UP (DERU) Test under Road Test in the Diagnosis and Testing portion of this section. INSPECT engine. REFER to appropriate section in Group 03.
Noise Most Pronounced on Turns	Front or rear wheel bearings.	INSPECT front/rear wheel bearings. REFER to appropriate section in Group 04 (2-wheel drive) or Group 05 (4-wheel drive) for front and rear wheel bearings.
	Differential side gears and pinion gears.	INSPECT/REPLACE faulty gears or clutch packs (if equipped with limited slip). REFER to appropriate section in Group 05.
Drive Noise, Coast Noise	Wheel bearings.	INSPECT front/rear wheel bearings. REFER to appropriate section in Group 04 for front wheel bearings on 4x2 vehicles or Group 05 for front and rear wheel bearings on 4x4 vehicles.
	Ring and pinion gear.	PERFORM Pinpoint Test G. INSPECT ring and pinion gear. REFER to appropriate section in Group 05.
Clunk on Acceleration or Deceleration	Inoperative throttle damper.	REFER to appropriate section in Group 03.
	Loose suspension components.	INSPECT suspension. REFER to appropriate section in Group 04.
	Worn and/or loose driveshaft U-joints/rear axle universal joint ******.	PERFORM Pinpoint Test J.
	Worn driveshaft slip-yoke splines or sticking slip-yoke.	PERFORM Pinpoint Test J.
	Loose engine mounts.	PERFORM Pinpoint Test C.
	Excessive ring and pinion gear backlash.	PERFORM Pinpoint Test G.
	Transmission (backlash).	REFER to appropriate section in Group 07.
Noise Is Different When Transmission in Drive During Coasting and When in Neutral During Coasting	Axle.	REFER to Pinpoint Test G.
	Transmission.	INSPECT transmission. REFER to appropriate section in Group 07.
Gear Howl and Whine	Ring gear runout. Insufficient bearing preload. Ring and pinion gear backlash. Worn ring and pinion gears.	PERFORM Pinpoint Test G.
Chuckle Noise	Broken gear teeth. Ring and pinion gear clearance.	PERFORM Pinpoint Test G.
Knock Noise	Axle shaft end play.	INSPECT and repair axle shafts. REFER to appropriate section in Group 05.

AXLE DIAGNOSIS REAR

Condition	Possible Source	Action
Vibration and Boom	Ring gear and pinion.	REFER to Axle Pitch Line Runout and/or Boom under Component Tests in this section.
Rear Axle Noise	Differential carrier. Axle shafts. Lubricant.	PERFORM Pinpoint Test G.
Loud "Clunk" in the Driveshaft When Shifting from Reverse to Forward	Driveshaft.	PERFORM Pinpoint Test J.
	Rear axle shaft or carrier.	PERFORM Pinpoint Test G.
On Turns, the Rear Axle Has a Chattering Noise (Limited Slip or Traction-Lok® Axles Only). Slight Chatter or Groaning Noise on Slow Turns After Extended Highway Driving Is Considered Acceptable and Has No Detrimental Effect on the Limited Slip Axle Functions.	Lubricant. Differential.	PERFORM Pinpoint Test G.

 

[miesk5]

Yo,
Here are the 1989 Ford Bronco EVTM, Emissions (yellowish/red book cover) & Pre-Delivery Manuals, Partial via mrnewland1 in Google Drive @
1989 Service manual - Google Drive
Slow scrolling, so download for faster viewing and to see the table of contents, the search feature, etc.

Haynes Red Manual for 80-95 Bronco & F Series @ Hanes guide 80-96 bko f series.pdf found by BroncMom

1989 Ford Bronco Dealer Brochure

1989 Bronco Lubricant Specifications by Ford via Gary

 

[Jimmyheaters]

Thank you

 

[johnnyreb]

I have a 1989 ford bronco and when I got it was making a loud noise when coming to a stop so I assumed it was my brakes because I also needed them done and I did get them done but the loud noise is still present when I am just starting to move and when I come to a stop and I am wondering what it could be

Have you looked at the heat shield above the muffler? I don,t know if your year has one,but I noticed my 78 does and it needs replaced.