Product Summary

Ford 9 Inch, Rear Position, 56" Overall Width, Natural

  • Housing measures a total of 56" from axle face to axle face
  • Housing is 50-1/2" from outside housing flange to outside housing flange
  • The axles are drilled for 5 x 4-1/2" Ford/Mopar and 5 x 4-3/4" Chevy/GM bolt patterns
  • Kit includes wheel studs, 1/2"-20 Ford and 7/16"-20 Chevy
  • Features 1/4" heavy duty late model large bearing style retainer plates
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Key Specs

MFG. Part #91045100
PositionRear
Overall Width56"
Axle Splines31
Axle TypeSemi-Floating
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Need To Know

Quick and Easy Returns

Return Policy

Speedway Motors 91045100 Details

Currie's Universal Hot Rod Ford 9" kit includes a brand new 56" housing, lifetime warranty 31 spline axles, new axle bearings and seals, and new style big Ford ends. 

  • Housing is 56" from axle face to axle face
  • Housing is 50-1/2" from outside housing flange to outside housing flange
  • Axles drilled for 5 x 4-1/2" Ford/Mopar and 5 x 4-3/4" Chevy/GM bolt patterns
  • Includes wheel studs, 1/2"-20 Ford and 7/16"-20 Chevy
  • 1/4" heavy duty late model large bearing style retainer plates

Note: Axle bearing does not come pressed onto the axle shaft, and wheel studs are not installed. Third member not included.

Installation Notes:

When installing new axles in rearends with posi traction differentials, be sure to install the driver's side axle first to keep the splines properly aligned.  Failure to do so may move the two splined gears out of alignment, and it may be difficult to install the driver's side axle properly if the passenger side axle is already installed.

Ifinstallation of passenger side axle is done first it may require two people when installing the driver's side axle, with both parties rotating reach axle until splines are in line and the driver's side axle fully sides into the housing.

To ensure you get the most out of your new 9 Inch components, Currie recommends that you perform a proper break-in process:

  • Use a name brand mineral-based gear oil, preferably 85w140 (Extremely high quality synthetic oils may be used once break-in process has been successfully performed)
  • Place vehicle on jack stands and let the rearend spin while the vehicle idles - run transmission in both forward and reverse periodically throughout the process
  • Continue to run the rearend until the pinion gets hot (place hand on bottom of the differential housing to verify this)
  • Proper break-in allows:
    • The ability to install new axles and hit the track the same day without worry
    • Extended life for rearend components
    • Keeps the quality and life of your gear oil

Note: If you find that your rearend is running somewhat "tight" be sure to addCurrie's 9+ Friction Modifierto "loosen up".  If a more aggressive performance is desired, Friction Modifier is not needed.

Application

  • 2.500" brake spacing offset
  • 2.800" axle register diameter

Charts

Specs

  • 2.500" brake spacing offset
  • 2.800" axle register diameter

Speedway Motors 91045100 Specifications

KEY SPECS
MFG. Part #91045100
BrandSpeedway Motors
PositionRear
Overall Width56"
Axle Splines31
Axle TypeSemi-Floating
Brakes IncludedNo
Wheel Studs IncludedNo
Wheel Bolt Pattern (in.)5x4.5 in. | 5x4.75 in.
Material TypeSteel
FinishNatural
Differential TypeLimited Slip
Tube O.D.2.5"
Housing MaterialSteel
Hardware IncludedYes
Rotors IncludedNo
Rotor DiameterNot Included
Bolt Pattern5 on 4.5" | 4.75"
GENERAL
Sold in QuantityKit
Axle Shafts IncludedYes
Third Member IncludedNo
Ring and Pinion IncludedYes
Wheel Stud Thread Size1/2"-20
Bearings IncludedYes
Seals IncludedYes
Differential IncludedNo
Ring Gear Size9 Inch
Housing ColorBlack
Cut to FitNo
Standard Pinion LocationOffset Pinion / Centered 3rd Member

Ratings & Reviews

5

7 Reviews

Overall Assessment

Customers praise our product, the Currie Rearend Assembly, for its exceptional quality, versatility, and value. They have lauded its perfect fit when integrated into classic vehicles, such as a '34 Ford coupe and a 1966 Mustang. Users express admiration for the immaculate welds, appreciating the minimal prep needed before optional customization, such as powder coating. The assembly works seamlessly with additional components such as the big brake kit, ensuring robust and reliable performance, integral for vehicles carrying heavy power loads. Despite the absence of bearing mounting instructions, the product easily assembles, heightening its practicality. Users fully endorse Currie's offerings, often favoring them over others for future purchases.

5

7 reviews

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7

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Very good quality

5.0

4 years ago

Me

Somewhere

Verified

Putting into a '34 Ford coupe and seems to be the correct width.

Would Recommend

Very Nice Rearend, currie does a great job. All new housing,

5.0

6 years ago

Mikey

Tacoma Wa.

Verified

Im gonna get this powder coated, i dont have no prep, the welds a beautiful.

Would Recommend

Great Product from Currie and Speedway.

5.0

8 years ago

The Colonel

Fish Creek, WI

Verified

The quality you would expect from Currie. Only thing lacking was instructions for mounting the axle bearing to the axle shaft. Purchased the Currie big brake kit to complement the package.

Would Recommend

I would buy this product again.

5.0

9 years ago

Pop's Speed Shop

Eugene, OR

Verified

Reasonable price for a name brand rearend.

Would Recommend

Perfect fit

5.0

13 years ago

Fedeco

Undisclosed

I converted a 1966 MUSTANG from a 8" rear to this 9" rear. The fit was a perfect match. I also purchased the third member from Speedway making he package complete making this bullet proof for a 289 with 5 speed manual trans and weian blower.!

Would Recommend

great product

5.0

13 years ago

oklahomadave

Illinois, USA

Verified

The rear end assembly went togeather with no problems, Currie puts out a great product, would recomend anyone looking for a rear end assy. to check out the Currie products.

Would Recommend

Great Product!

5.0

16 years ago

DanBo

Fremont, CA

High quality rear end product. Comes with everything you need (axles, bearings and hardware). Just add the third member, weld on your brackets and you're ready to go.

Would Recommend

Showing 7 of 7 reviews

Questions & Answers

19 Questions • 12 Answers

can i use this on a 1976 corvette

by steve

• 8 years ago

3 answers

From what I can measure the 56" rear end should work with my original 1930 model A with full metal fenders running 225 55 17 tires and zero offset on the rims. Does this sound correct? Thanks

by Big K

• 8 years ago

1 answer

Do you sell the centre housing on its own without the axels?

by Pamzie

• 9 years ago

1 answer

Can I get this in a 62 inch

by Bob

• 9 years ago

1 answer

Can I get it in 54 inches? Part number.

by Eric

• 9 years ago

1 answer

Will this fit a 1949 Ford F1?

by David

• 10 years ago

1 answer

DOES THIS COME WITH AN AXLE VENT?

by WHITEY

• 10 years ago

1 answer

DOES THIS COME WITH HOUSING STUDS AND OR NUTS FOR THE CENTER SECTION?

by WHITEY

• 10 years ago

1 answer

will this fit a 77 ford f100 ranger with a 302 automatic?

by devin

• 10 years ago

1 answer

Can you recommend everything I need to complete this rear end with the part numbers?

by Kyle

• 10 years ago

1 answer

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