Ford Racing 2019 Ford Mustang Super 8.8in IRS Loaded Differential Housing 3.55

SKU: FRPM-4001-88355B

Independent Suspension Differential Assemblies

FR Differential Housings

Ford Racing

Ford Racing 2019 Ford Mustang Super 8.8in IRS Loaded Differential Housing 3.55

SKU: FRPM-4001-88355B

Independent Suspension Differential Assemblies

FR Differential Housings

LOW STOCK! Est Ship 3-5 days. HURRY! LOW STOCK. This item is in limited stock at one of our distribution centres. The ETA is the approximate time required to prepare your order for dispatch.

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Description

Ford Performance Parts 8.8 in. IRS loaded differential housings are improvements to the rear axle of your Mustang. Whether you're replacing the original in your manual or strengthening the cast aluminum model in your automatic, there's nothing better than Ford Performance differential housings to do the job perfectly. Besides, who knows your Mustang better than the maker? These 8.8 in. IRS housings are fully loaded with forged, and CNC-cut gear sets installed. They feature strong cast iron topped with an aluminum differential cover, and, depending on the application chosen, a Torsen or Traction-Lok differential is included. If your automatic sees a lot of track time or your manual has a broken housing, your only choice should be genuine Ford Performance 8.8 in. IRS loaded differential housings.

Product Overview

Loaded Differential Housing; Iron Housing w/Aluminum Cover; Incl. Pinion Flange w/93mm Bolt Circle And 110mm Driveshaft Pilot Installed;

Features and Benefits

Iron Housing With Aluminum Cover
Incl. 3.55:1 Ratio Gear Set M-4209-88355A
Incl. Traction-Lok Differential M-4204-M
Custom Calibration Required For Speedometer and Shift Corrections

Product Details

Year	Make
Axle Type:	Ford 8 in.
Description:	Loaded Differential Housing
Differential Case Design Type:	Ford 8.8 IRS
Part Number:	frpM-4001-88355B
Position:	N/A
Prop 65 Yes/No:	No
Title:	Ford Performance - Mustang Super 8.8" IRS Loaded Differential Housing 3.55 - M-4001-88355B
WARNING CA Proposition 65:	No

Part Type

Independent Suspension Differential Assemblies

Data: v4.2 - Upd: 2026-10-01 00:41:58

Features

Custom Calibration Required For Speedometer and Shift Corrections
Incl. 3.55:1 Ratio Gear Set M-4209-88355A
Incl. Traction-Lok Differential M-4204-M
Iron Housing With Aluminum Cover

Specifications

Product Attributes - Brand: Ford Performance Parts
Product Attributes - Manufacturer's Part Number: M-4001-88355B
Product Attributes - Part Type: Independent Suspension Differential Assemblies
Product Attributes - Product Line: Ford Performance Parts 8.8 in. IRS Loaded Differential Housings
Product Attributes - UPC: 756122013069
Product Attributes - Center Section Type: Traction-Lok
Product Attributes - Ring and Pinion Included: Yes
Product Attributes - Ring and Pinion Ratio: 3.55:1
Product Attributes - Bearings Included: Yes
Product Attributes - Seals Included: Yes
Product Attributes - Mounting Hardware Included: No
Product Attributes - Axle Shafts Included: No
Product Attributes - Brakes Included: No
Product Attributes - Wheel Studs Included: No
Product Attributes - Wheel Hubs Included: No
Product Attributes - Quantity: Sold individually.
Product Attributes - Notes: Features a cast iron housing with an aluminum cover and pinion flange with a 93mm bolt circle and 110mm driveshaft pilot. Original equipment on 2019 Mustang GT. Custom calibration required for speedometer and shift corrections.

Reference Information

Brand Name/s	Ford Racing
StreetFX SKU	frpM-4001-88355B
SFX Item ID	4302768
Supplier Item Code	4302768
Manufacturer SKU	M-4001-88355B
Manufacturer UPC	756122013069
Alternative References	fms-m400188355b, 8.8in

Compatibility

Application Data

Application Notes	Features a cast iron housing with an aluminum cover and pinion flange with a 93mm bolt circle and 110mm driveshaft pilot. Original equipment on 2019 Mustang GT. Custom calibration required for speedometer and shift corrections.
Axle Location	Rear
Axle Model	Ford 8.8 in., IRS
Beginning Year	2019
Brake Style	Disc
Drivetrain	RWD
Ending Year	2020
Make	FORD
Model	MUSTANG
Submodel	BULLITT
Transmission	Automatic
Universal	No

Application Notes	Features a cast iron housing with an aluminum cover and pinion flange with a 93mm bolt circle and 110mm driveshaft pilot. Original equipment on 2019 Mustang GT. Custom calibration required for speedometer and shift corrections.
Axle Location	Rear
Axle Model	Ford 8.8 in., IRS
Beginning Year	2019
Brake Style	Disc
Drivetrain	RWD
Ending Year	2020
Make	FORD
Model	MUSTANG
Submodel	BULLITT
Transmission	Manual
Universal	No

Application Notes	Features a cast iron housing with an aluminum cover. These applications using a 95 mm bolt circle and 113mm driveshaft pilot require FR3Z-4821-B pinion flange. Custom calibration required for speedometer and shift corrections.
Axle Location	Rear
Axle Model	Ford 8.8 in., IRS
Beginning Year	2015
Brake Style	Disc
Drivetrain	RWD
Ending Year	2017
Make	FORD
Model	MUSTANG
Submodel	ECOBOOST
Transmission	Automatic
Universal	No

Application Notes	Features a cast iron housing with an aluminum cover. These applications using a 95 mm bolt circle and 113mm driveshaft pilot require FR3Z-4821-B pinion flange. Custom calibration required for speedometer and shift corrections.
Axle Location	Rear
Axle Model	Ford 8.8 in., IRS
Beginning Year	2015
Brake Style	Disc
Drivetrain	RWD
Ending Year	2017
Make	FORD
Model	MUSTANG
Submodel	ECOBOOST
Transmission	Manual
Universal	No

Application Notes	Features a cast iron housing with an aluminum cover and pinion flange with a 93mm bolt circle and 110mm driveshaft pilot. Original equipment on 2019 Mustang GT. Custom calibration required for speedometer and shift corrections.
Axle Location	Rear
Axle Model	Ford 8.8 in., IRS
Beginning Year	2018
Brake Style	Disc
Drivetrain	RWD
Ending Year	2022
Make	FORD
Model	MUSTANG
Submodel	ECOBOOST
Transmission	Automatic
Universal	No

Application Notes	Features a cast iron housing with an aluminum cover and pinion flange with a 93mm bolt circle and 110mm driveshaft pilot. Original equipment on 2019 Mustang GT. Custom calibration required for speedometer and shift corrections.
Axle Location	Rear
Axle Model	Ford 8.8 in., IRS
Beginning Year	2018
Brake Style	Disc
Drivetrain	RWD
Ending Year	2022
Make	FORD
Model	MUSTANG
Submodel	ECOBOOST
Transmission	Manual
Universal	No

Application Notes	Features a cast iron housing with an aluminum cover. These applications using a 95 mm bolt circle and 113mm driveshaft pilot require FR3Z-4821-B pinion flange. Custom calibration required for speedometer and shift corrections.
Axle Location	Rear
Axle Model	Ford 8.8 in., IRS
Beginning Year	2015
Brake Style	Disc
Drivetrain	RWD
Ending Year	2017
Make	FORD
Model	MUSTANG
Submodel	ECOBOOST PREMIUM
Transmission	Automatic
Universal	No

Application Notes	Features a cast iron housing with an aluminum cover. These applications using a 95 mm bolt circle and 113mm driveshaft pilot require FR3Z-4821-B pinion flange. Custom calibration required for speedometer and shift corrections.
Axle Location	Rear
Axle Model	Ford 8.8 in., IRS
Beginning Year	2015
Brake Style	Disc
Drivetrain	RWD
Ending Year	2017
Make	FORD
Model	MUSTANG
Submodel	ECOBOOST PREMIUM
Transmission	Manual
Universal	No

Application Notes	Features a cast iron housing with an aluminum cover and pinion flange with a 93mm bolt circle and 110mm driveshaft pilot. Original equipment on 2019 Mustang GT. Custom calibration required for speedometer and shift corrections.
Axle Location	Rear
Axle Model	Ford 8.8 in., IRS
Beginning Year	2018
Brake Style	Disc
Drivetrain	RWD
Ending Year	2022
Make	FORD
Model	MUSTANG
Submodel	ECOBOOST PREMIUM
Transmission	Automatic
Universal	No

Application Notes	Features a cast iron housing with an aluminum cover and pinion flange with a 93mm bolt circle and 110mm driveshaft pilot. Original equipment on 2019 Mustang GT. Custom calibration required for speedometer and shift corrections.
Axle Location	Rear
Axle Model	Ford 8.8 in., IRS
Beginning Year	2018
Brake Style	Disc
Drivetrain	RWD
Ending Year	2022
Make	FORD
Model	MUSTANG
Submodel	ECOBOOST PREMIUM
Transmission	Manual
Universal	No

Application Notes	Features a cast iron housing with an aluminum cover. These applications using a 95 mm bolt circle and 113mm driveshaft pilot require FR3Z-4821-B pinion flange. Custom calibration required for speedometer and shift corrections.
Axle Location	Rear
Axle Model	Ford 8.8 in., IRS
Beginning Year	2015
Brake Style	Disc
Drivetrain	RWD
Ending Year	2017
Make	FORD
Model	MUSTANG
Submodel	GT
Transmission	Automatic
Universal	No

Application Notes	Features a cast iron housing with an aluminum cover. These applications using a 95 mm bolt circle and 113mm driveshaft pilot require FR3Z-4821-B pinion flange. Custom calibration required for speedometer and shift corrections.
Axle Location	Rear
Axle Model	Ford 8.8 in., IRS
Beginning Year	2015
Brake Style	Disc
Drivetrain	RWD
Ending Year	2017
Make	FORD
Model	MUSTANG
Submodel	GT
Transmission	Manual
Universal	No

Application Notes	Features a cast iron housing with an aluminum cover and pinion flange with a 93mm bolt circle and 110mm driveshaft pilot. Original equipment on 2019 Mustang GT. Custom calibration required for speedometer and shift corrections.
Axle Location	Rear
Axle Model	Ford 8.8 in., IRS
Beginning Year	2018
Brake Style	Disc
Drivetrain	RWD
Ending Year	2022
Make	FORD
Model	MUSTANG
Submodel	GT
Transmission	Automatic
Universal	No

Application Notes	Features a cast iron housing with an aluminum cover and pinion flange with a 93mm bolt circle and 110mm driveshaft pilot. Original equipment on 2019 Mustang GT. Custom calibration required for speedometer and shift corrections.
Axle Location	Rear
Axle Model	Ford 8.8 in., IRS
Beginning Year	2018
Brake Style	Disc
Drivetrain	RWD
Ending Year	2022
Make	FORD
Model	MUSTANG
Submodel	GT
Transmission	Manual
Universal	No

Application Notes	Features a cast iron housing with an aluminum cover. These applications using a 95 mm bolt circle and 113mm driveshaft pilot require FR3Z-4821-B pinion flange. Custom calibration required for speedometer and shift corrections.
Axle Location	Rear
Axle Model	Ford 8.8 in., IRS
Beginning Year	2015
Brake Style	Disc
Drivetrain	RWD
Ending Year	2015
Make	FORD
Model	MUSTANG
Submodel	GT 50 YEARS LIMITED EDITION
Transmission	Automatic
Universal	No

Application Notes	Features a cast iron housing with an aluminum cover. These applications using a 95 mm bolt circle and 113mm driveshaft pilot require FR3Z-4821-B pinion flange. Custom calibration required for speedometer and shift corrections.
Axle Location	Rear
Axle Model	Ford 8.8 in., IRS
Beginning Year	2015
Brake Style	Disc
Drivetrain	RWD
Ending Year	2015
Make	FORD
Model	MUSTANG
Submodel	GT 50 YEARS LIMITED EDITION
Transmission	Manual
Universal	No

Application Notes	Features a cast iron housing with an aluminum cover. These applications using a 95 mm bolt circle and 113mm driveshaft pilot require FR3Z-4821-B pinion flange. Custom calibration required for speedometer and shift corrections.
Axle Location	Rear
Axle Model	Ford 8.8 in., IRS
Beginning Year	2015
Brake Style	Disc
Drivetrain	RWD
Ending Year	2017
Make	FORD
Model	MUSTANG
Submodel	GT PREMIUM
Transmission	Automatic
Universal	No

Application Notes	Features a cast iron housing with an aluminum cover. These applications using a 95 mm bolt circle and 113mm driveshaft pilot require FR3Z-4821-B pinion flange. Custom calibration required for speedometer and shift corrections.
Axle Location	Rear
Axle Model	Ford 8.8 in., IRS
Beginning Year	2015
Brake Style	Disc
Drivetrain	RWD
Ending Year	2017
Make	FORD
Model	MUSTANG
Submodel	GT PREMIUM
Transmission	Manual
Universal	No

Application Notes	Features a cast iron housing with an aluminum cover and pinion flange with a 93mm bolt circle and 110mm driveshaft pilot. Original equipment on 2019 Mustang GT. Custom calibration required for speedometer and shift corrections.
Axle Location	Rear
Axle Model	Ford 8.8 in., IRS
Beginning Year	2018
Brake Style	Disc
Drivetrain	RWD
Ending Year	2022
Make	FORD
Model	MUSTANG
Submodel	GT PREMIUM
Transmission	Automatic
Universal	No

Application Notes	Features a cast iron housing with an aluminum cover and pinion flange with a 93mm bolt circle and 110mm driveshaft pilot. Original equipment on 2019 Mustang GT. Custom calibration required for speedometer and shift corrections.
Axle Location	Rear
Axle Model	Ford 8.8 in., IRS
Beginning Year	2018
Brake Style	Disc
Drivetrain	RWD
Ending Year	2022
Make	FORD
Model	MUSTANG
Submodel	GT PREMIUM
Transmission	Manual
Universal	No

Application Notes	Features a cast iron housing with an aluminum cover. These applications using a 95 mm bolt circle and 113mm driveshaft pilot require FR3Z-4821-B pinion flange. Custom calibration required for speedometer and shift corrections.
Axle Location	Rear
Axle Model	Ford 8.8 in., IRS
Beginning Year	2015
Brake Style	Disc
Drivetrain	RWD
Ending Year	2017
Make	FORD
Model	MUSTANG
Submodel	SHELBY GT350
Transmission	Automatic
Universal	No

Application Notes	Features a cast iron housing with an aluminum cover. These applications using a 95 mm bolt circle and 113mm driveshaft pilot require FR3Z-4821-B pinion flange. Custom calibration required for speedometer and shift corrections.
Axle Location	Rear
Axle Model	Ford 8.8 in., IRS
Beginning Year	2015
Brake Style	Disc
Drivetrain	RWD
Ending Year	2017
Make	FORD
Model	MUSTANG
Submodel	SHELBY GT350
Transmission	Manual
Universal	No

Application Notes	Features a cast iron housing with an aluminum cover and pinion flange with a 93mm bolt circle and 110mm driveshaft pilot. Original equipment on 2019 Mustang GT. Custom calibration required for speedometer and shift corrections.
Axle Location	Rear
Axle Model	Ford 8.8 in., IRS
Beginning Year	2018
Brake Style	Disc
Drivetrain	RWD
Ending Year	2020
Make	FORD
Model	MUSTANG
Submodel	SHELBY GT350
Transmission	Automatic
Universal	No

Application Notes	Features a cast iron housing with an aluminum cover and pinion flange with a 93mm bolt circle and 110mm driveshaft pilot. Original equipment on 2019 Mustang GT. Custom calibration required for speedometer and shift corrections.
Axle Location	Rear
Axle Model	Ford 8.8 in., IRS
Beginning Year	2018
Brake Style	Disc
Drivetrain	RWD
Ending Year	2020
Make	FORD
Model	MUSTANG
Submodel	SHELBY GT350
Transmission	Manual
Universal	No

Application Notes	Features a cast iron housing with an aluminum cover. These applications using a 95 mm bolt circle and 113mm driveshaft pilot require FR3Z-4821-B pinion flange. Custom calibration required for speedometer and shift corrections.
Axle Location	Rear
Axle Model	Ford 8.8 in., IRS
Beginning Year	2015
Brake Style	Disc
Drivetrain	RWD
Ending Year	2017
Make	FORD
Model	MUSTANG
Submodel	SHELBY GT350R
Transmission	Automatic
Universal	No