Alliance R21-4N Truck Parts For Sale

2016 Alliance R21-4N Rear Axle Housing

Contact for price

Condition	Used
Fits To Make(s)	ALLIANCE
Fits To Model(s)	R21-4N
Stock Number	2619258
MLS Number	14247378
Category	Axle Housings, Rear
Last Updated	3/17/2026
Location	Athens, GA, US
Sold By	LKQ Heavy Truck

2017 Alliance R21-4N Rear Axle Housing

Contact for price

Condition	Used
Fits To Make(s)	ALLIANCE
Fits To Model(s)	R21-4N
Stock Number	2618816
MLS Number	14247339
Category	Axle Housings, Rear
Last Updated	3/17/2026
Location	Athens, GA, US
Sold By	LKQ Heavy Truck

2024 Alliance R21-4N Rear Axle Housing

$1,750 USD

RS-21.0-4 BY DIFF TAG, WITH 10 HUB PILOT WHEELS, AIR ABS

Condition	Used
Fits To Make(s)	ALLIANCE
Fits To Model(s)	R21-4N
Stock Number	2570029
MLS Number	13915749
Category	Axle Housings, Rear
Last Updated	3/7/2026
Location	Toledo, OH, US
Sold By	LKQ Heavy Truck

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2014 Alliance R21-4N Rear Differential for a Freightliner M2 106

$1,795 USD

USED ALLIANCE R21-4N REAR REAR DIFFERENTIAL, RATIO 5.22. THE PRICE IS FOR THE DIFFERENTIAL ONLY BUT WE HAVE HOUSINGS AVAILABLE IF NEEDED.

Condition	Used
Rear End	5.22 ratio
Fits To Make(s)	FREIGHTLINER
Fits To Model(s)	M2 106
Stock Number	96614
MLS Number	13085256
Category	Differentials, Rear
Last Updated	1/6/2026
Location	Crandall, TX, US
Sold By	Tim Jordan's Truck Parts Inc.

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Alliance R21-4N Rear Differential

$750 USD

Good used Alliance R21-4N Rear, rear Differential Assembly. 6.14 Ratio. 90 day guarantee for swap or refund

Condition	Used
Rear End	6.14 ratio
Fits To Make(s)	ALLIANCE
Fits To Model(s)	R21-4N
Stock Number	Ryd R21-4N/6.14/46
MLS Number	13363031
Category	Differentials, Rear
Last Updated	1/1/2026
Location	Fitchburg, MA, US
Sold By	Rydemore Heavy Duty Truck Parts

2015 Alliance R21-4N Rear Axle Assembly

$1,500 USD

ALLIANCE R21-4N, 5.56 RATIO

Condition	Used
Rear End	5.56 ratio
Fits To Make(s)	ALLIANCE
Fits To Model(s)	R21-4N
Capacity	21,000LBS
Stock Number	2545984
MLS Number	13800184
Category	Axle Assemblies, Rear
Last Updated	12/24/2025
Location	Easton, MD, US
Sold By	LKQ Heavy Truck

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NUMBERCall Seller

2015 Alliance R21-4N Rear Differential for a Freightliner M2 106

Contact for price

USED ALLIANCE R21-4N SINGLE REAR DIFFERENTIAL/5.88 RATIO/HYD BRAKES

Condition	Used
Rear End	5.88 ratio
Fits To Make(s)	FREIGHTLINER
Fits To Model(s)	M2 106
Stock Number	90787
MLS Number	12835563
Category	Differentials, Rear
Last Updated	9/30/2025
Location	Crandall, TX, US
Sold By	Tim Jordan's Truck Parts Inc.

Alliance R21-4N Rear Axle Assembly

$800.14 USD

CHECK ID

Condition	Used
Fits To Make(s)	ALLIANCE
Fits To Model(s)	R21-4N
Capacity	21,000
Stock Number	2542718
MLS Number	13727385
Category	Axle Assemblies, Rear
Last Updated	7/29/2025
Location	Toledo, OH, US
Sold By	LKQ Heavy Truck

Alliance R21-4N Rear Axle Assembly

$1,350.35 USD

2 BOLT LEFT, DIFF R6813511005, 15+1 ABS,

Condition	Used
Fits To Make(s)	ALLIANCE
Fits To Model(s)	R21-4N
Capacity	21,000
Stock Number	2528425
MLS Number	13641273
Category	Axle Assemblies, Rear
Last Updated	7/3/2025
Location	Toledo, OH, US
Sold By	LKQ Heavy Truck

Alliance R21-4N Rear Axle Assembly

$1,350.35 USD

2 BOLT LEFT, DIFF R6813511005, 15+1 ABS,

Condition	Used
Fits To Make(s)	ALLIANCE
Fits To Model(s)	R21-4N
Capacity	21,000
Stock Number	2528423
MLS Number	13641272
Category	Axle Assemblies, Rear
Last Updated	7/3/2025
Location	Toledo, OH, US
Sold By	LKQ Heavy Truck

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2023 NTO Alliance R21-4N take out axle assembly

$3,605 USD

NTO R21-4N take out axle assembly, Position: Rear

Condition	New
Will Fit Year(s)	2023
Part Number	681530406
Stock Number	317-10245
MLS Number	13628170
Category	Axle Assemblies, Rear
Last Updated	1/24/2026
Location	Dorr, MI, US
Sold By	Frontier Truck Parts

Alliance R21-4N Rear Axle Assembly

$2,295 USD

15+1 ABS SPIDER, FRTLINER, 2 BOLT TOP ANGLE LEFT, DIFF A-9733510305

Condition	Used
Rear End	5.22 ratio
Fits To Make(s)	ALLIANCE
Fits To Model(s)	R21-4N
Capacity	23,000
Stock Number	2308301
MLS Number	12377462
Category	Axle Assemblies, Rear
Last Updated	6/2/2025
Location	Toledo, OH, US
Sold By	LKQ Heavy Truck

2018 Alliance R21-4N Rear Axle Assembly

$1,500.24 USD

ALLIANCE R21-4N, 5.22 RATIO,

Condition	Used
Rear End	5.22 ratio
Fits To Make(s)	ALLIANCE
Fits To Model(s)	R21-4N
Capacity	21,000 LBS
Stock Number	R18H0453
MLS Number	12172527
Category	Axle Assemblies, Rear
Last Updated	6/2/2025
Location	Easton, MD, US
Sold By	LKQ Heavy Truck

2014 Alliance R21-4N Rear Axle Assembly

$1,500.24 USD

5.87 RATIO

Condition	Used
Rear End	5.87 ratio
Fits To Make(s)	ALLIANCE
Fits To Model(s)	R21-4N
Capacity	21,000
Stock Number	R14B8185
MLS Number	12476816
Category	Axle Assemblies, Rear
Last Updated	6/2/2025
Location	Easton, MD, US
Sold By	LKQ Heavy Truck

2007 Alliance R21-4N Rear Axle Assembly

$1,500.24 USD

Condition	Used
Rear End	4.78 ratio
Fits To Make(s)	ALLIANCE
Fits To Model(s)	R21-4N
Capacity	33000
Stock Number	2410245
MLS Number	12891382
Category	Axle Assemblies, Rear
Last Updated	2/7/2025
Location	Tampa, FL, US
Sold By	LKQ Heavy Truck

2005 Alliance R21-4N Rear Axle Assembly

$1,500.24 USD

Condition	Used
Rear End	4.78 ratio
Fits To Make(s)	ALLIANCE
Fits To Model(s)	R21-4N
Capacity	21,000
Stock Number	2254280
MLS Number	12059236
Category	Axle Assemblies, Rear
Last Updated	2/7/2025
Location	Tampa, FL, US
Sold By	LKQ Heavy Truck

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Alliance R21-4N Rear Differential

$1,200 USD

Remanufactured Alliance R21-4N rear, rear differential assembly. 4.77 ratio. 1 Year warranty for parts or Swap out for another unit. $500 For Labor. Towing not covered

Condition	Remanufactured
Rear End	4.77 ratio
Fits To Make(s)	ALLIANCE
Fits To Model(s)	R21-4N
Stock Number	BP TRS R21-4N/4.77
MLS Number	14050459
Category	Differentials, Rear
Last Updated	12/18/2025
Location	Fitchburg, MA, US
Sold By	Rydemore Heavy Duty Truck Parts

(833) 359-___ SHOW
NUMBERCall Seller

2015 Alliance R21-4N Rear Differential for a Freightliner M2 106

$1,895 USD

USED ALLIANCE R21-4N SINGLE AXLE DIFFERENTIAL ASSEMBLY WITH LOCKER - RATIO: 6.14

Condition	Used
Rear End	6.14 ratio
Fits To Make(s)	FREIGHTLINER
Fits To Model(s)	M2 106
Stock Number	89950
MLS Number	12834961
Category	Differentials, Rear
Last Updated	10/8/2025
Location	Crandall, TX, US
Sold By	Tim Jordan's Truck Parts Inc.

2021 Alliance R21-4N Rear Axle Assembly

$1,450 USD

A9733510305 CAST # ON THE DIFF, SPRING SUSPENSION,

Condition	Used
Rear End	5.88 ratio
Fits To Make(s)	ALLIANCE
Fits To Model(s)	R21-4N
Capacity	23,000
Stock Number	2533082
MLS Number	13796386
Category	Axle Assemblies, Rear
Last Updated	9/5/2025
Location	Toledo, OH, US
Sold By	LKQ Heavy Truck