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Rockwell RS21145 Axles & Differentials For Sale in United States

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Axles & Differentials (52)
   Axle Housings, Front (1)    Axle Housings, Rear (23)    Differentials, Front (2)    Differentials, Rear (26)
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Showing 1 - 25 of 52 Listings

1 - 25 of 52 listings
1 - 25 of 52 listings
Rockwell RS21145 Rear Differential for a Rockwell RS-21-145

Rockwell RS21145 Rear Differential for a Rockwell RS-21-145

$500 USD
Good used Rockwell RS-21-145 rear, rear differential assembly. 5.29 ratio. 90 day guarantee for swap or refund
ConditionUsed
Rear End5.29 ratio
Fits To Make(s)ROCKWELL
Fits To Model(s)RS-21-145
Stock NumberRyd RS-21-145/5.29/
MLS Number10310485
CategoryDifferentials, Rear
Last Updated3/2/2026
Location
Fitchburg, MA, US
Sold By
Rydemore Heavy Duty Truck Parts
(888) 519-___  SHOW
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Rydemore Heavy Duty Truck Parts
Rockwell RS21145 Rear Differential for a Rockwell RS-21-145

Rockwell RS21145 Rear Differential for a Rockwell RS-21-145

$600 USD
Good used Rockwell RS-21-145 rear, rear differential assembly. 3.58 ratio. 90 day guarantee for swap or refund
ConditionUsed
Rear End3.58 ratio
Fits To Make(s)ROCKWELL
Fits To Model(s)RS-21-145
Stock NumberRyd RS-21-145/3.58/
MLS Number10568084
CategoryDifferentials, Rear
Last Updated1/15/2026
Location
Fitchburg, MA, US
Sold By
Rydemore Heavy Duty Truck Parts
(888) 519-___  SHOW
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Rydemore Heavy Duty Truck Parts
Rockwell RS21145 Rear Differential for a Rockwell RS-21-145

Rockwell RS21145 Rear Differential for a Rockwell RS-21-145

$600 USD
Good used Rockwell RS-21-145 rear, rear differential assembly. 4.63 ratio. 90 day guarantee for swap or refund
Quantity2
ConditionUsed
Rear End4.63 ratio
Fits To Make(s)ROCKWELL
Fits To Model(s)RS-21-145
Stock NumberRyd RS-21-145/4.63/
MLS Number11424959
CategoryDifferentials, Rear
Last Updated1/9/2026
Location
Fitchburg, MA, US
Sold By
Rydemore Heavy Duty Truck Parts
(888) 519-___  SHOW
NUMBERCall Seller
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Rydemore Heavy Duty Truck Parts
Rockwell RS21145 Rear Differential for a Rockwell RS-21-145

Rockwell RS21145 Rear Differential for a Rockwell RS-21-145

$600 USD
Good used Rockwell RS-21-145 rear, rear differential assembly. 5.57 ratio. 90 day guarantee for swap or refund
Quantity2
ConditionUsed
Rear End5.57 ratio
Fits To Make(s)ROCKWELL
Fits To Model(s)RS-21-145
Stock NumberRyd RS-21-145/5.57/
MLS Number10643517
CategoryDifferentials, Rear
Last Updated1/6/2026
Location
Fitchburg, MA, US
Sold By
Rydemore Heavy Duty Truck Parts
(888) 519-___  SHOW
NUMBERCall Seller
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Rydemore Heavy Duty Truck Parts
Rockwell RS21145 Rear Differential for a Rockwell RS-21-145

Rockwell RS21145 Rear Differential for a Rockwell RS-21-145

$500 USD
Good used Rockwell RS-21-145 rear, rear differential assembly. 4.88 ratio. 90 day guarantee for swap or refund
ConditionUsed
Rear End4.88 ratio
Fits To Make(s)ROCKWELL
Fits To Model(s)RS-21-145
Stock NumberRyd RS-21-145/4.88/
MLS Number10643330
CategoryDifferentials, Rear
Last Updated1/1/2026
Location
Fitchburg, MA, US
Sold By
Rydemore Heavy Duty Truck Parts
(888) 519-___  SHOW
NUMBERCall Seller
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Rydemore Heavy Duty Truck Parts
Rockwell RS21145 Rear Differential for a Rockwell RS-21-145

Rockwell RS21145 Rear Differential for a Rockwell RS-21-145

$500 USD
Good used Rockwell RS-21-145 rear, rear differential assembly. 4.11 ratio. 90 day guarantee for swap or refund
Quantity2
ConditionUsed
Rear End4.11 ratio
Fits To Make(s)ROCKWELL
Fits To Model(s)RS-21-145
Stock NumberRyd RS-21-145/4.11/
MLS Number10524900
CategoryDifferentials, Rear
Last Updated1/1/2026
Location
Fitchburg, MA, US
Sold By
Rydemore Heavy Duty Truck Parts
(888) 519-___  SHOW
NUMBERCall Seller
Email Seller
Save
Rydemore Heavy Duty Truck Parts
Rockwell RS21145 Rear Differential for a Rockwell RS-21-145

Rockwell RS21145 Rear Differential for a Rockwell RS-21-145

$600 USD
Good used Rockwell RS-21-145 rear, rear differential assembly. 5.86 ratio. 90 day guarantee for swap or refund
ConditionUsed
Rear End5.86 ratio
Fits To Make(s)ROCKWELL
Fits To Model(s)RS-21-145
Stock NumberRyd RS-21-145/5.86/
MLS Number11121773
CategoryDifferentials, Rear
Last Updated7/30/2025
Location
Fitchburg, MA, US
Sold By
Rydemore Heavy Duty Truck Parts
(888) 519-___  SHOW
NUMBERCall Seller
Email Seller
Save
Rydemore Heavy Duty Truck Parts
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