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Rockwell RS21145 Rear Differentials For Sale

Shop new and used Rockwell RS21145 Rear Differentials on MyLittleSalesman.com . Compare active listings with prices from $450 to $1,250. Sellers include Rydemore Heavy Duty Truck Parts, Spalding Truck Parts, Bobby Johnson Equipment, and more. Filter by condition, price, or year to find the Rockwell RS21145 Rear Differential that fits your job.
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Showing 1 - 25 of 27 Rear Differential Listings

1 - 25 of 27 listings
1 - 25 of 27 listings
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
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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
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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
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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
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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
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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. 5.29 ratio. 90 day guarantee for swap or refund
Quantity2
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 Updated1/1/2026
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. 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
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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

$1,000 USD
Remanufactured Rockwell RS-21-145 rear, rear differential assembly. 6.43 ratio. 1 Year warranty for parts or Swap out for another unit. $500 For Labor. Towing not covered
ConditionRemanufactured
Rear End6.43 ratio
Fits To Make(s)ROCKWELL
Fits To Model(s)RS-21-145
Stock NumberBP TRS RS-21-145/6.
MLS Number14050719
CategoryDifferentials, Rear
Last Updated12/18/2025
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

$1,000 USD
Remanufactured Rockwell RS-21-145 rear, rear differential assembly. 5.13 ratio. 1 Year warranty for parts or Swap out for another unit. $500 For Labor. Towing not covered
ConditionRemanufactured
Rear End5.13 ratio
Fits To Make(s)ROCKWELL
Fits To Model(s)RS-21-145
Stock NumberBP TRS RS-21-145/5.
MLS Number14050670
CategoryDifferentials, Rear
Last Updated12/18/2025
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

$1,000 USD
Remanufactured Rockwell RS-21-145 rear, rear differential assembly. 3.73 ratio. 1 Year warranty for parts or Swap out for another unit. $500 For Labor. Towing not covered
Quantity4
ConditionRemanufactured
Rear End3.73 ratio
Fits To Make(s)ROCKWELL
Fits To Model(s)RS-21-145
Stock NumberBP TRS RS-21-145/3.
MLS Number14050658
CategoryDifferentials, Rear
Last Updated12/18/2025
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

$1,000 USD
Remanufactured Rockwell RS-21-145 rear, rear differential assembly, 6.14 ratio. 1 Year warranty for parts or Swap out for another unit. $500 For Labor. Towing not covered
Quantity2
ConditionRemanufactured
Rear End6.14 ratio
Fits To Make(s)ROCKWELL
Fits To Model(s)RS-21-145
Stock NumberBP TRS RS-21-145/6.
MLS Number14050642
CategoryDifferentials, Rear
Last Updated12/18/2025
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

$1,000 USD
Remanufactured Rockwell RS-21-145 rear, rear differential assembly. 3.07 ratio. 1 Year warranty for parts or Swap out for another unit. $500 For Labor. Towing not covered
ConditionRemanufactured
Rear End3.07 ratio
Fits To Make(s)ROCKWELL
Fits To Model(s)RS-21-145
Stock NumberBP TRS RS-21-145/3.
MLS Number14050623
CategoryDifferentials, Rear
Last Updated12/18/2025
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

$1,000 USD
Remanufactured Rockwell RS-21-145 rear, rear differential assembly. 2.64 ratio.
Quantity4
ConditionRemanufactured
Rear End2.64 ratio
Fits To Make(s)ROCKWELL
Fits To Model(s)RS-21-145
Stock NumberBP TRS RS-21-145/2.
MLS Number14050592
CategoryDifferentials, Rear
Last Updated12/18/2025
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

$1,000 USD
Remanufactured Rockwell RS-21-145 rear, rear differential assembly. 4.56 ratio. 1 Year warranty for parts or Swap out for another unit. $500 For Labor. Towing not covered
Quantity2
ConditionRemanufactured
Rear End4.56 ratio
Fits To Make(s)ROCKWELL
Fits To Model(s)RS-21-145
Stock NumberBP TRS RS-21-145/4.
MLS Number14050578
CategoryDifferentials, Rear
Last Updated12/18/2025
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

$1,000 USD
Remanufactured Rockwell RS-21-145 new style rear, rear differential assembly. 4.10 ratio. 1 Year warranty for parts or Swap out for another unit. $500 For Labor. Towing not covered
ConditionRemanufactured
Rear End4.10 ratio
Fits To Make(s)ROCKWELL
Fits To Model(s)RS-21-145
Stock NumberBP TRS RS-21-145/4.
MLS Number14050556
CategoryDifferentials, Rear
Last Updated12/18/2025
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

$1,000 USD
Remanufactured Rockwell rear, rear differential assembly. 4.88 ratio. 1 Year warranty for parts or Swap out for another unit. $500 For Labor. Towing not covered
ConditionRemanufactured
Rear End4.88 ratio
Fits To Make(s)ROCKWELL
Fits To Model(s)RS-21-145
Stock NumberBP TRS RS-21-145/4.
MLS Number14050518
CategoryDifferentials, Rear
Last Updated12/18/2025
Location
Fitchburg, MA, US
Sold By
Rydemore Heavy Duty Truck Parts
(888) 519-___  SHOW
NUMBERCall Seller
Email Seller
Save
Rydemore Heavy Duty Truck Parts
Rockwell RS21145 Rear Differential for a Rockwell RS-21-145

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

$1,000 USD
Remanufactured Rockwell RS-21-145 rear, rear differential assembly. 3.91 ratio. 1 Year warranty for parts or Swap out for another unit. $500 For Labor. Towing not covered
ConditionRemanufactured
Rear End3.91 ratio
Fits To Make(s)ROCKWELL
Fits To Model(s)RS-21-145
Stock NumberBP TRS RS-21-145/3.
MLS Number14050457
CategoryDifferentials, Rear
Last Updated12/18/2025
Location
Fitchburg, MA, US
Sold By
Rydemore Heavy Duty Truck Parts
(888) 519-___  SHOW
NUMBERCall Seller
Email Seller
Save
Rydemore Heavy Duty Truck Parts
Rockwell RS21145 Rear Differential for a Rockwell RS-21-145

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

$1,000 USD
Remanufactured Rockwell RS-21-145 rear, rear differential assembly. 2.79 ratio. 1 Year warranty for parts or Swap out for another unit. $500 For Labor. Towing not covered
Quantity2
ConditionRemanufactured
Rear End2.79 ratio
Fits To Make(s)ROCKWELL
Fits To Model(s)RS-21-145
Stock NumberBP TRS RS-21-145/2.
MLS Number14050448
CategoryDifferentials, Rear
Last Updated12/18/2025
Location
Fitchburg, MA, US
Sold By
Rydemore Heavy Duty Truck Parts
(888) 519-___  SHOW
NUMBERCall Seller
Email Seller
Save
Rydemore Heavy Duty Truck Parts
Rockwell RS21145 Rear Differential for a Rockwell RS-21-145

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

$1,000 USD
Remanufactured Rockwell RS21-145 rear, rear differential assembly. 4.10 ratio. 1 Year warranty for parts or Swap out for another unit. $500 For Labor. Towing not covered
Quantity3
ConditionRemanufactured
Rear End4.10 ratio
Fits To Make(s)ROCKWELL
Fits To Model(s)RS-21-145
Stock NumberBP TRS RS-21-145/4.
MLS Number14050430
CategoryDifferentials, Rear
Last Updated12/18/2025
Location
Fitchburg, MA, US
Sold By
Rydemore Heavy Duty Truck Parts
(888) 519-___  SHOW
NUMBERCall Seller
Email Seller
Save
Rydemore Heavy Duty Truck Parts
Rockwell RS21145 Rear Differential for a Rockwell RS-21-145

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

$1,000 USD
Remanufactured Rockwell RS-21-145 rear, rear differential assembly. 7.17 ratio. 1 Year warranty for parts or Swap out for another unit. $500 For Labor. Towing not covered
Quantity3
ConditionRemanufactured
Rear End7.17 ratio
Fits To Make(s)ROCKWELL
Fits To Model(s)RS-21-145
Stock NumberBP TRS RS-21-145/7.
MLS Number14050391
CategoryDifferentials, Rear
Last Updated12/18/2025
Location
Fitchburg, MA, US
Sold By
Rydemore Heavy Duty Truck Parts
(888) 519-___  SHOW
NUMBERCall Seller
Email Seller
Save
Rydemore Heavy Duty Truck Parts
Rockwell RS21145 Rear Differential for a Rockwell RS-21-145

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

$1,000 USD
Remanufactured Rockwell RS21-145 rear, rear differential assembly. 3.42 ratio. 1 Year warranty for parts or Swap out for another unit. $500 For Labor. Towing not covered
Quantity4
ConditionRemanufactured
Rear End3.42 ratio
Fits To Make(s)ROCKWELL
Fits To Model(s)RS-21-145
Stock NumberBP TRS RS-21-145/3.
MLS Number14050378
CategoryDifferentials, Rear
Last Updated12/18/2025
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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