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Founder, 1929-2014
Speedy Bill
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Ford 9 Inch Posi Traction Third Member Assembly

SAME DAY SHIPPING! Order within the next 5 hours 26 minutes and receive same day shipping

Specs
Sold in Quantity:
Each
Spline Count:
-
Housing Material:
Cast-Iron
Gear Ratio:
-
Garage Sale:
No
Ring Gear Weight:
Standard
Differential Type:
Limited Slip
Yoke Series:
1310
Ford 9 Inch Posi Traction Third Member Assembly
Ford 9 Inch Posi Traction Third Member Assembly

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Ford 9 Inch Posi Traction Third Member Assembly

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What's in the Box

Speedway Motors now offers you a 9" Ford street 3rd member for your street rod. We reclaim genuine Ford 9" housings, clean, inspect and install all new components. All bearings, seals, 1310 series yoke and ring & pinion are new!

These Ford 9" 3rd member assemblies feature new Pro Gears ring & pinion, choice of 3.50, 3.70, 3.89, 4.11 or 4.56, Currie 9-Plus limited slip differential, 28 or 31 spline. Shipped in handy plastic carrying case. Assembled by professionals.

 

Currie Differential Tech Bulletin (PDF)

 

910-48345 Instructions (PDF)

You may also be interested in:

Fel-Pro Gaskets P2302 9 Inch Ford Pumpkin Gaskets
                        

Lose the RTV silicone! With Fel-Pro reuseable third member housing gaskets, you don’t have to worry about applying an RTV and waiting for it to set up to seal. In addition, installing precut Fel-Pro gaskets helps eliminate the risk of contaminating the differential housing with RTV.

Gaskets have a steel core and non-stick coating.

Currie 9 Inch Ford Rear Axle Kit
                        

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
  • 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.

Currie Rear Axle Installation Instructions

How to Measure Your Housing Tech Tip (Link)

Need a certain length not found on our site?  Check out Currie's 9+ Rearend Calculator to have specially sized axles or rearend housings made for your specific application.  Custom orders will be built and processed directly through Currie Enterprizes and shipped to your door. For ease of ordering, please refer to Currie's Dimension Diagram

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.

If installation 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 add Currie's 9+ Friction Modifier to "loosen up".  If a more aggressive performance is desired, Friction Modifier is not needed.

 

 

Lubrication Engineers SAE 90 Weight Gear Oil, 1 Gallon
                        Whether you're running a stock flattie and rearend or hopped-up overhead and quick change, you need to run a good gear lube. Remember that your rearend was designed fifty plus years ago and needs all the help it can get. 

The biggest improvement you can give it is a lubricant that will allow the gears to survive the highway speeds that cars see today. L.E. gear oil is what we use in our 350 mph streamliner, that uses a V-8 quick change, without failure. The "red stuff" provides superior lubrication for long gear life. You can't win if you don't finish. We suggest 90 weight for the street and 140 weight for extreme uses.

  • Formulated using blends of high quality paraffinic and synthetic base fluids
  • Contains a highly shear stable tackiness
  • Unique blend of base fluids and thermally stable EP additives
  • Separates readily from water
  • Contains non-silicone defoaming additives
  • Contains no solids
  • Contains DUOLEC LE's proprietary dual acting liquid wear-reducing and extreme pressure additive
LE Gear Oil Performance Data Sheet (PDF)

LE Gear Oil Safety Data Sheet  (PDF)

Red Line 58205 Heavy Shockproof Synthetic Gear Oil, 1 Gallon
                        

Red Line Oil's team of chemists formulate fully-synthetic engine oils using only the world's finest base stocks. It's not designed to be the cheapest – it's built to be the best. The world's top racing team and most discriminating enthusiasts use Red Line Motor Oil products exclusively.

Red Line Shock Proof gear oil is designed for heavily loaded racing and street differentials that see heavy shock loading. It contains a unique solid dispersant that cushions gear teeth to help prevent breakage. Red Line Shock Proof provides the protection of a 75W250 with the fluid thickness properties of a 75W90.

Ideal for use in sprint, midget, and dirt late model differentials as well as in rear ends using spools or lockers.

SuperSeal 9 Inch Ford Pumpkin Gasket
                        Our reuseable rear differential gaskets have a steel core and non-stick coating. Fits 9" Ford rear axle third member housings.
                    
Currie 9+-98126 9 Inch Ford Cut-To-Fit 31 Spline Axle, 26 Inch
                        

These axles have 4" of spline which will allow you to cut a maximum of 3" of the spline off to obtain the correct length. This is perfect for small shops and will allow you to build your own custom width rear end easily. Axle length is measured from the flange to the end of the splines. All CTF axles come with a full installation package which includes one set of five 1/2"-20 Ford style wheel studs, one set of five 7/16"-20 Chevy style wheel studs, one set-20 tapered roller bearing with race, seal, & collar, and one heavy duty late model large bearing style retainer plate.

  • 9 Inch Ford
  • 31 Spline
  • 26 Inch Long
  • Drilled for both 5 on 4-1/2" and 5 on 4-3/4" wheel bolt patterns
  • Includes both 7/16"-20 and 1/2"-20 wheel studs
  • Compatible with "Big Ford - New Style" housing and brakes with 2-1/2" offset
  • Includes a set-20 bearing and retainer you will have to press on
  • Axles sold each, not as a pair

How to Measure Your Housing Tech Tip (Link)

Need a certain length not found on our site?  Check out Currie's 9+ Rearend Calculator to have specially sized axles or rearend housings made for your specific application.  Custom orders will be built and processed directly through Currie Enterprizes and shipped to your door. For ease of ordering, please refer to Currie's Dimension Diagram

 
New Ford 9 Inch Aluminum Carrier Housing w/3.062 Inch Caps
                        

This brand new carrier housing is built to take street/strip abuse without the fear of breaking. Our aluminum housing has forged caps and extra beef where it's needed. Most stock differentials use the 3.062" o.d. bearings # TLM603049 w/ 1.781" i/d.

The aluminum case will save you 20 lbs. over the cast iron version. You should also add a new heavy duty aluminum pinion support while you're at it. 

Carrier caps torque to 95 ft lbs.

NEW Ford 9 Inch Posi Traction Third Member
                        

Our completely NEW 9" Ford third members start with a heavy duty cast iron carrier featuring the larger, cast iron Daytona pinion support. Then we use a Currie 9+ limited slip differential in your choice of 28 or 31 spline and a 3.50, 3.70, 3.89, 4.11, or 4.56 gear ratio ring & pinion. Also includes NEW bearings and seals. Shipped ready for use in a plastic case.


Currie Differential Tech Bulletin (PDF)

Lucas 10048 SAE 75W-90 Synthetic Racing Gear Oil, 1 Gallon
                        

Lucas SAE 75W-90 Synthetic Gear Oil is a non-foaming, super slick, long lasting lubricant designed especially for heavy duty or high performance applications where other gear lubricants just aren't good enough.

Contains a special additive package that cushions gears and resists "squeezing out" under extreme pressure situations where other gear lubricants just aren't good enough. Specially designed to stand up to high temperatures without losing its lubricity.

  • Heavy duty
  • High performance
  • Stands up to high temperatures
Universal Drive Shaft U-Bolts, 1-1/16 Inch Cap
                        Speedway universal drive shaft U-bolts are forged steel for 50% more strength than standard units. Fits U-joints with 1-1/16" diameter caps.
                    
Currie 9+-99011 Posi-Traction Lube Additive, 4 oz.
                        

Currie 9-Plus posi-traction lube additive for Currie differentials. For use in Trac-Lock, limited slip, and posi traction rearends

  • Reduces hypoid gear noise and clutch chatter
  • Promotes smoother, quieter operation
  • Extends clutch life
  • Add to 9-Plus Racing Gear Oil
  • 4 ounce bottle