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Raybestos 1639R Brake Drum - Rear

Brand	Raybestos 1639R
Position	Rear
Outside Diameter	0.498
Outside Diameter	12.650
Depth	3.560
Depth	90.400
Outer Cooling Fins	Yes
Nominal Drum Diameter	0.396
Nominal Drum Diameter	10.050
Stud/Lug Hole Quantity	5
Stud/Lug Hole Diameter	0.611
Stud/Lug Hole Diameter	15.500
Product line	R-Line
Fits	Ford and Mercury · 58 vehicles

Cooling fins. Help move heat away for more consistent braking performance.

Brake drum. A straightforward replacement for drum brake applications.

R-Line. Raybestos line focused on dependable everyday service.

Cross-references Anchor 8792, Centric Parts 123.61034 and Gates 21210 for the same application. See all 18.

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Brake Drums are typically replaced in pairs, axle by axle.

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Free returns within 60 days if it doesn't fit when fitment is verified.

Not what you need? See all Brake Drum options

Raybestos R-Line Brake Drum 1639R

Raybestos R-Line brake drum 1639R is a rear brake drum for select Ford and Mercury applications from 1967-1973. It is built with a 12.650-inch outside diameter, 3.560-inch depth, and 5-lug hole pattern to match the specified rear drum brake setups.

The R-Line product line focuses on direct replacement brake components for everyday service needs. For this application, the 1639R includes outer cooling fins and the listed drum dimensions needed for vehicles such as the Ford Mustang, Mercury Cougar, and Mercury Montego.

Key Features

Rear brake drum for select 1967-1973 Ford and Mercury vehicles
12.650-inch outside diameter and 3.560-inch depth
5 stud/lug holes with 15.500 mm lug hole diameter
Outer cooling fins: Yes
Nominal drum diameter: 10.050 inches
Raybestos R-Line part number 1639R

Detailed Description

Use the Raybestos 1639R when servicing rear drum brake systems that call for a cast drum with the listed dimensions and finned construction. This brake drum is listed for 1973 Ford Mustang rear applications with cast iron drum, 1967-1973 Mercury Cougar rear applications with full cast drum, and 1968-1971 Mercury Montego rear applications with the specified 10-inch brake configurations. If you are searching for a rear brake drum for a 1973 Ford Mustang or a rear brake drum for a Mercury Cougar or Mercury Montego, this part number provides a direct-reference option for those fitments.

This part cross-references Centric Parts 123.61034 and Gates 21210 for the same application.

What It Helps Address

Rear brake drum wear, scoring, or out-of-round condition
Brake pulsation caused by drum surface irregularities
Reduced braking consistency in drum brake service
Replacement needs during rear brake system restoration
Fitment-specific service for classic Ford Mustang, Mercury Cougar, and Mercury Montego rear brakes

Installation Notes and Tips

Confirm the vehicle’s rear brake configuration, drum diameter, lug hole pattern, and depth before installation. Match the application notes exactly, including cast iron drum, full cast drum, finned drum, and 10-inch brake specifications where listed. Inspect related brake components and verify proper drum seating and adjustment during service.

Quality Assurance

Raybestos R-Line brake components are cataloged as direct replacement parts for specified vehicle applications. Verify part number 1639R against the vehicle’s rear brake specifications before ordering or installation.

This part fits 58 vehicles

Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

Year	Make	Model	Submodel	Liters	Cylinders	Position	Notes
1973	Ford	Mustang	—	5.8L	V8	Rear	with Cast Iron Drum; R-Line
1973	Mercury	Cougar	—	—	—	Rear	with Full Cast Drum; R-Line
1972	Mercury	Comet	—	—	—	Rear	with 10in x 2-1/2in Brakes; with Full Cast Finned Drum; with 10 IN x 2 IN Brakes; R-Line
1972	Mercury	Cougar	—	—	—	Rear	with Full Cast Drum; R-Line
1971	Ford	Ranchero	—	—	—	Rear	with Flared Drum; R-Line
1971	Ford	Torino	—	—	—	Rear	10" Diameter; with Full Cast Finned Drum; R-Line
1971	Mercury	Comet	—	—	—	Rear	with 10in x 2-1/2in Brakes; with Full Cast Finned Drum; with 10 IN x 2 IN Brakes; R-Line
1971	Mercury	Cougar	—	—	—	Rear	with Full Cast Drum; R-Line
1971	Mercury	Cyclone	—	—	—	Rear	with 10in x 2-1/2in Brakes; with Full Cast Finned Drum; with 10 IN x 2 IN Brakes; R-Line
1971	Mercury	Montego	Base	—	—	Rear	with 10in x 2-1/2in Brakes; with Full Cast Finned Drum; with 10 IN x 2 IN Brakes; R-Line
1971	Mercury	Montego	Villager	—	—	Rear	with 10in x 2-1/2in Brakes; with Full Cast Finned Drum; with 10 IN x 2 IN Brakes; R-Line
1971	Mercury	Montego	MX	—	—	Rear	with 10in x 2-1/2in Brakes; with Full Cast Finned Drum; with 10 IN x 2 IN Brakes; R-Line
1971	Mercury	Montego	MX Brougham	—	—	Rear	with 10in x 2-1/2in Brakes; with Full Cast Finned Drum; with 10 IN x 2 IN Brakes; R-Line
1970	Ford	Fairlane	—	—	—	Rear	10" Diameter; with Full Cast Finned Drum; R-Line
1970	Ford	Ranchero	—	—	—	Rear	with Flared Drum; R-Line
1970	Ford	Torino	—	—	—	Rear	10" Diameter; with Full Cast Finned Drum; R-Line
1970	Mercury	Cougar	—	—	—	Rear	with Full Cast Drum; R-Line
1970	Mercury	Cyclone	—	—	—	Rear	with 10in x 2-1/2in Brakes; with Full Cast Finned Drum; with 10 IN x 2 IN Brakes; R-Line
1970	Mercury	Montego	Base	—	—	Rear	with 10in x 2-1/2in Brakes; with Full Cast Finned Drum; with 10 IN x 2 IN Brakes; R-Line
1970	Mercury	Montego	Villager	—	—	Rear	with 10in x 2-1/2in Brakes; with Full Cast Finned Drum; with 10 IN x 2 IN Brakes; R-Line
1970	Mercury	Montego	MX	—	—	Rear	with 10in x 2-1/2in Brakes; with Full Cast Finned Drum; with 10 IN x 2 IN Brakes; R-Line
1970	Mercury	Montego	MX Brougham	—	—	Rear	with 10in x 2-1/2in Brakes; with Full Cast Finned Drum; with 10 IN x 2 IN Brakes; R-Line
1969	Ford	Fairlane	Base	—	—	Rear	with 10in x 2-1/2in Brakes; with Full Cast Drum; with 10 IN x 2 IN Brakes; R-Line
1969	Ford	Fairlane	500	—	—	Rear	with 10in x 2-1/2in Brakes; with Full Cast Drum; with 10 IN x 2 IN Brakes; R-Line
1969	Ford	Ranchero	—	—	—	Rear	with Flared Drum; R-Line
1969	Ford	Torino	—	—	—	Rear	with 10in x 2-1/2in Brakes; with Full Cast Drum; with 10 IN x 2 IN Brakes; R-Line
1969	Mercury	Comet	—	—	—	Rear	with 10in x 2-1/2in Brakes; with Full Cast Finned Drum; with 10 IN x 2 IN Brakes; R-Line
1969	Mercury	Cougar	—	—	—	Rear	with Full Cast Drum; R-Line
1969	Mercury	Cyclone	—	—	—	Rear	with 10in x 2-1/2in Brakes; with Full Cast Finned Drum; with 10 IN x 2 IN Brakes; R-Line
1969	Mercury	Montego	Base	—	—	Rear	with 10in x 2-1/2in Brakes; with Full Cast Finned Drum; with 10 IN x 2 IN Brakes; R-Line
1969	Mercury	Montego	MX	—	—	Rear	with 10in x 2-1/2in Brakes; with Full Cast Finned Drum; with 10 IN x 2 IN Brakes; R-Line
1968	Ford	Fairlane	Base	—	—	Rear	with 10in x 2-1/2in Brakes; with Full Cast Drum; with 10 IN x 2 IN Brakes; R-Line
1968	Ford	Fairlane	500	—	—	Rear	with 10in x 2-1/2in Brakes; with Full Cast Drum; with 10 IN x 2 IN Brakes; R-Line
1968	Ford	Ranchero	—	—	—	Rear	with Flared Drum; R-Line
1968	Ford	Torino	—	—	—	Rear	with 10in x 2-1/2in Brakes; with Full Cast Drum; with 10 IN x 2 IN Brakes; R-Line
1968	Mercury	Comet	—	—	—	Rear	with 10in x 2-1/2in Brakes; with Full Cast Finned Drum; with 10 IN x 2 IN Brakes; R-Line
1968	Mercury	Cougar	—	—	—	Rear	with Full Cast Drum; R-Line
1968	Mercury	Cyclone	—	—	—	Rear	with 10in x 2-1/2in Brakes; with Full Cast Finned Drum; with 10 IN x 2 IN Brakes; R-Line
1968	Mercury	Montego	Base	—	—	Rear	with 10in x 2-1/2in Brakes; with Full Cast Finned Drum; with 10 IN x 2 IN Brakes; R-Line
1968	Mercury	Montego	MX	—	—	Rear	with 10in x 2-1/2in Brakes; with Full Cast Finned Drum; with 10 IN x 2 IN Brakes; R-Line
1967	Ford	Fairlane	Base	—	—	Rear	with 10in x 2-1/2in Brakes; with Full Cast Drum; with 10 IN x 2 IN Brakes; R-Line
1967	Ford	Fairlane	500	—	—	Rear	with 10in x 2-1/2in Brakes; with Full Cast Drum; with 10 IN x 2 IN Brakes; R-Line
1967	Ford	Fairlane	500XL	—	—	Rear	with 10in x 2-1/2in Brakes; with Full Cast Drum; with 10 IN x 2 IN Brakes; R-Line
1967	Ford	Ranchero	—	—	—	Rear	with Flared Drum; R-Line
1967	Mercury	Comet	—	—	—	Rear	with 10in x 2-1/2in Brakes; with Full Cast Finned Drum; with 10 IN x 2 IN Brakes; R-Line
1967	Mercury	Cougar	—	—	—	Rear	with Full Cast Drum; R-Line
1967	Mercury	Cyclone	—	—	—	Rear	with 10in x 2-1/2in Brakes; with Full Cast Finned Drum; with 10 IN x 2 IN Brakes; R-Line
1966	Ford	Fairlane	Base	—	—	Rear	with 10in x 2-1/2in Brakes; with Full Cast Drum; with 10 IN x 2 IN Brakes; R-Line
1966	Ford	Fairlane	500	—	—	Rear	with 10in x 2-1/2in Brakes; with Full Cast Drum; with 10 IN x 2 IN Brakes; R-Line
1966	Ford	Fairlane	500XL	—	—	Rear	with 10in x 2-1/2in Brakes; with Full Cast Drum; with 10 IN x 2 IN Brakes; R-Line
1966	Ford	Ranchero	—	—	—	Rear	with Flared Drum; R-Line
1966	Mercury	Comet	—	—	—	Rear	with Full Cast Finned Drum; with 10 IN x 2 IN Brakes; R-Line
1965	Ford	Fairlane	—	—	—	Rear	with 10in x 2-1/2in Brakes; with Full Cast Drum; with 10 IN x 2 IN Brakes; R-Line
1964	Ford	Fairlane	—	—	—	Rear	with 10in x 2-1/2in Brakes; with Full Cast Drum; with 10 IN x 2 IN Brakes; R-Line
1964	Ford	Ranch Wagon	—	—	—	Rear	with 10in x 2-1/2in Brakes; with Full Cast Drum; with 10 IN x 2 IN Brakes; R-Line
1963	Ford	Fairlane	—	—	—	Rear	with 10in x 2-1/2in Brakes; with Full Cast Drum; with 10 IN x 2 IN Brakes; R-Line
1963	Ford	Ranch Wagon	—	—	—	Rear	with 10in x 2-1/2in Brakes; with Full Cast Drum; with 10 IN x 2 IN Brakes; R-Line
1962	Ford	Fairlane	—	—	—	Rear	with 10in x 2-1/2in Brakes; with Full Cast Drum; with 10 IN x 2 IN Brakes; R-Line
No rows match your filter.

Directly replaces or cross-references 18 part numbers

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.

Anchor — 8792Centric Parts — 123.61034Gates — 21210Raybestos Brakes — 1639R88-34034122.61034177-19316391639DGS8792C212262-C731639AD8134BD1011C6OZ1126CD5639G1639X21466