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800.979.0122

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Since 1952
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Ford 9 Inch Posi Traction Third Member Assembly

Free Shipping Free Shipping
Specs
Sold in Quantity:
Each
Spline Count:
-
Hazmat Flag:
No
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

Click image to enlarge

Details

Reviews

Q & A

What's in the Box

If you’re looking for a complete third member for your Ford 9-inch rear end housing, but want the added performance of a limited slip differential, Speedway Motors now offers you a 9" Ford street 3rd member for your street rod. We start with reclaimed, genuine Ford 9-inch carrier housings and then clean and inspect them prior to installing all-new bearings, seals, a 1310-series yoke, and your choice of ring-and-pinion gears. The 1310-series yoke is the correct size for many Ford applications with cups 1-1/16 inch in outside diameter and a span of 3-7/32 inch across.

These Ford 9 inch third member assemblies feature a Richmond Powertrax Grip Pro differential available in 28 or 31 spline axle shaft configurations. This clutch-type differential is perfect for light-to-medium weight street vehicles where one wants posi-action and long clutch life, without the adverse handling effects or noise of a full locker. When coasting around turns, the clutches are disengaged to extend clutch life. When accelerating in a straight line on dry pavement, the clutches engage, sending equal power to both wheels for maximum traction. This makes them ideal for street use, with the occasional trip to the drag strip as well.

All third members are assembled by our team of professionals and are delivered to you in a handy plastic carrying case, for an overall value that can’t be beat

Available in your choice of 3.50, 3.70, 3.89, 4.11 or 4.56 gear ratio.

Gear lube recommendations :

  • 910-44090 - for street and every day driving under normal conditions
  • 910-44140 -  for extreme duty, towing, or very hot climates

Instructions (PDF)

Customer Reviews

Rated 4.5 out of 5 by 22 reviewers.
RATING BREAKDOWN
22 reviews
5 Stars
16
4 Stars
3
3 Stars
2
2 Stars
0
1 Star
1
RECOMMEND THIS PRODUCT:

Rick
Verified Purchaser
Verified Reviewer
Wisconsin

I'd buy it again !!

May 26, 2015
The reareend was put together well, once put in, it works flawlessly !
Pros:
  • Shipped fast
  • Worked Perfect
  • My Mechanic Was Impressed
Cons:
  • None
Yes, I recommend this product.
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Filliflier
Verified Purchaser
Philadelphia, PA

What you need at an affordable price

May 13, 2015
Product has performed flawlessly. Was just as advertised.
Yes, I recommend this product.
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oldrockerdan
Verified Purchaser
Spring Hill, Florida

Absolute bargain

April 12, 2015
After buying separate parts to build an assembly in the past and realizing a large expense with no guarantees I tried Speedway's product. It arrived much sooner than expected. Other than the refurbished casing it was all new as described. This is for my street rod and does not need to be as bullet proof as a racing unit. The storage container is an added bonus to hold a spare. The price can't be beat!
Yes, I recommend this product.
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Rocky1932
Verified Purchaser
Davenport, FL, USA

All looks good ready to go

March 30, 2015
Rear arrived in cardboard box that was damaged but upon opening the box I was greatly relieved to see that speedway had taken extra care in packaging the rear in a form fitted heavy duty plastic carrier. Car runs really well only took us about an hour to put it in hardest part of assembly was putting rear end fluid into the 9 inch Ford rear. Really puts power to the tires from the 5.7 Hemi ,TKO 5 speed in a 32 Ford
Yes, I recommend this product.
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Lloyd2
Verified Purchaser
Paso Robles, CA 93446, USA

9" third member

March 27, 2015
have not installed it yet, however, this item was shipped on time and arrived without any problems. The 9" center section appears to be in great shape. I would highly recommend this to anyone. I have ordered other things from Speedway and they have always been great.
Yes, I recommend this product.
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bigbro
Verified Purchaser
Hemet, CA, USA

9 inch

March 26, 2015
real tight car will not move until you gas, it maybe too tight not shure,
Yes, I recommend this product.
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Bailey74
Verified Purchaser
Blaine, TN, USA

Very well pleased

March 20, 2015
Installed on my 74 ford f100 4x4 loved the case it came in And the care it seemed to give the the third member, I drive this truck everyday and I would by another, but not for this truck I believe it's going to be ok for years to come. Great value ! Thanks speedway!
Yes, I recommend this product.
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Scrambler
Verified Purchaser

Noisy Bearings

February 16, 2015
Unfortunately this Third Member has a very loud growl on decelleration. In my experience I believe it's the pinion bearings or at least the wrong pre-load. I was very disappointed when I took the car out for a test drive after the install. My only mission was to have a quiet rear end.. I'll be taking it back out and attempting to re-set the pre-load and back lash as soon as I have time...
Cons:
  • noisey
No, I would not recommend this product.
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Merchant Response:

Scrambler - We apologize for the noisy bearings. Customer Service has offered to send this customer a shipping label to return this 3rd member to our shop for us to look into. We apologize for the inconvenience and are always happy to help in any way that we can!
36buickthreewindow
Verified Purchaser
Saint Louis, MO, USA

Could not build for this price.

January 27, 2015
Delivered on schedule in 5 days as promised and packaged well. My builder (an ex rear end specialist) checked it over and very impressed with the quality. He indicated from the start he could not build this product close to this price and saw no surprises. He will be installing soon..
Yes, I recommend this product.
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TrickyRick514

3rd member does not fit - not a 9 inch!

August 05, 2014
This 3rd member does not fit my 57' 9 inch housing. Lucky I was not on my back attempting this operation! 70' Mustang on hoist, 3rd member on trans jack, and still I fought it for an hour...would not slide in. Good for me, my race team did know what Speedway sold me was a Lincoln 9 3/8 Diff. All I need to do now is to clean, grind a notch, and clean the housing to install it. You guys must have got a deal on Lincoln gears hey? Measure very carefully out there! Not Happy today in Michigan. See ya on Woodward... Tricky Rick Race Team.
Cons:
  • 9 inch is not a 9 inch-measure very carefully!
No, I would not recommend this product.
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Merchant Response:

TrickyRick514 ??_ Thanks for your review. We appreciate hearing from you. Your review has been passed along to our Customer Service team to review the situation and our QC team to record and inspect the issue with this product. Please note that the bearing kit, spool, and ring and pinion in the 3rd member provided to our customers are and will be a 9" Ford unit as we only have 9" ring and pinions in house and available to us. The case may have been originally a 9-3/8" case, but all of the 9" components are interchangeable and able to be utilized for the installation. Please feel free to contact us at 800.979.0122 for further assistance. We apologize for your frustration and are always happy to help.
Page 1 of 3

Product Q&A

28 questions : 31 answers

1 answers

I bought this last year on a project car and would like to change the yoke out to a 1330 do you sell it? how many splines are on the 1310 yoke that came with it?

Ricks69
Canton, GA, USA
March 31, 2015

I bought this last year on a project car and would like to change the yoke out to a 1330 do you sell it? how many splines are on the 1310 yoke that came with it?

Answers

April 01, 2015
EricM
The yoke is 28 spline on a 9" Ford rear end. Sorry we do not offer a 9" Ford yoke that has a 1330 U-joint size. You may want to get a conversion U-joint such as 91045134 if your drive shaft uses a 1330 U joint size.
1 answers

Will this work in a 1968 F100 2wd I've got a 68 F100 with a mild 351w and 4speed top loader. I want to replace the wore out 31 spline posi unit in it now. I don't drive the truck a lot but love to burn the tires up when I do. Will this unit hold up to that?

68F100
Indiana
March 28, 2015

Will this work in a 1968 F100 2wd I've got a 68 F100 with a mild 351w and 4speed top loader. I want to replace the wore out 31 spline posi unit in it now. I don't drive the truck a lot but love to burn the tires up when I do. Will this unit hold up to that?

Answers

March 30, 2015
EricM
The posi unit that we use in these third members is a Currie unit which is a replica of the Ford 4 pinion track-lock. If a stock track-lock has been surviving then this unit should take the abuse as well.
1 answers

will the 1310 yoke work with a chevy u-joint? This 3rd member will be on a Ford 9" on a 1968 Camaro. Will the 1310 yoke mate to the existing GM 10 bolt or do I need to change that?

Lloyd
Paso Robles, CA 93446, USA
February 23, 2015

will the 1310 yoke work with a chevy u-joint? This 3rd member will be on a Ford 9" on a 1968 Camaro. Will the 1310 yoke mate to the existing GM 10 bolt or do I need to change that?

Answers

February 23, 2015
EricM
Check the measurements of the U-joint on your drive shaft to be sure but the 1310 U-joint is common for GM cars. The cap diameter is 1 1/6" and the width is 3 7/32"
2 answers

What else is included with the 3rd member assembly? Any Hardware,friction modifier?

RestoMod
Ga
January 04, 2015

What else is included with the 3rd member assembly? Any Hardware,friction modifier?

Answers

February 17, 2015
Scrambler
Nothing but a 1310 yoke.
January 05, 2015
EricM
You will receive the assembled third member and tote like you see it. We do include a bottle of friction modifier 91099012 with these but no other additional items are included.
1 answers

will the ford 9 inch third member assembly fit a 1952 f-100 truck?

Dadj
Ohio, USA
November 05, 2014

will the ford 9 inch third member assembly fit a 1952 f-100 truck?

Answers

November 06, 2014
EricM
I believe your 1952 F100 would have a Dana 44 rear end in stock form so this would not be correct for you. If you have swapped a 9" Ford rear end into your pickup then this third member would work fine.
2 answers

What spline count are they wanting, axle or yolk? I'm considering this product for an 82 ford f150 mud truck, I need to know what spline count they are wanting, splines on the axle or yolk?

Sbittle2
Ada, OK, USA
August 24, 2014

What spline count are they wanting, axle or yolk? I'm considering this product for an 82 ford f150 mud truck, I need to know what spline count they are wanting, splines on the axle or yolk?

Answers

February 17, 2015
Scrambler
Axle spline 31. Pinion yoke spline 28.
August 25, 2014
EricM
You can choose between 28 spline or 31 spline axles. The yokes will all be the stock 9" spline count of 28 spline.
1 answers

Irecently purchased a Speedway 3rd member and changed the 1310 yoke to a 1330 yoke. What is the torque value for the pinion nut?

32Rodder
Camarillo, CA, USA
May 31, 2014

Irecently purchased a Speedway 3rd member and changed the 1310 yoke to a 1330 yoke. What is the torque value for the pinion nut?

Answers

June 02, 2014
EricM
Torque the pinion nut to 180 ft lbs.
1 answers

I have blown 66 nova big tire street most of the time maybe a blast every once in awhile do you think it will hold & any idea on the noise turning

PAIN
MD
April 16, 2014

I have blown 66 nova big tire street most of the time maybe a blast every once in awhile do you think it will hold & any idea on the noise turning

Answers

April 16, 2014
EricM
These third members are assembled with stock replacement parts and thus are only applicable to something you would use a stock 9" third member for. Big tires and blowers are typically not in that category, but it might last a while.
1 answers

Is there any reason I could not use this in my truck? Also, do any of your third member assembly's come with an open differential? If so what's the price difference?

Mackie
NY
April 13, 2014

Is there any reason I could not use this in my truck? Also, do any of your third member assembly's come with an open differential? If so what's the price difference?

Answers

April 14, 2014
EricM
Yes you could use this in your 1978 F150 as long as it has a 9" rear end. Check your axle spline so that you can get the correct one. Sorry I do not offer complete third members with open differentials.
1 answers

how much torque / horse power is this unit good for ?

Helldivex
March 28, 2014

how much torque / horse power is this unit good for ?

Answers

March 28, 2014
EricM
Sorry we do not have a horsepower or torque rating on these third members. It uses the original for style "heavy duty" limited slip and original replacement type ring and pinion gears. These are for use in any application that you would use stock 9" Ford gears or third member in. This third member is intended for street use and is not recommend for use in a drag racing application.
Page 1 of 3

You may also be interested in:

Fel-Pro Gaskets P2302 9 Inch Ford Pumpkin Gaskets
(Part #3442302)
                        

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
(Part #91045100)
                        

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
(Part #91044090)
                        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
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LE Gear Oil Performance Data Sheet (PDF)

LE Gear Oil Safety Data Sheet  (PDF)

Red Line 58205 Heavy Shockproof Synthetic Gear Oil, 1 Gallon
(Part #60720120)
                        

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.

Speedway 9 Inch Ford Pumpkin Gasket
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Currie 9+-98126 9 Inch Ford Cut-To-Fit 31 Spline Axle, 26 Inch
(Part #91045120)
                        

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
(Part #91048393)
                        

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
(Part #91048445)
                        

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 Richmond Powertrax Grip Pro differential in your choice of 28 or 31 spline.

All third members are assembled by our team of professionals and are delivered to you in a handy plastic carrying case, for an overall value that can’t be beat

Available in your choice of 3.50, 3.70, 3.89, 4.11 or 4.56 gear ratio ring & pinion. 

Lucas 10048 SAE 75W-90 Synthetic Racing Gear Oil, 1 Gallon
(Part #484100481)
                        

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
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Universal Drive Shaft U-Bolts, 1-1/16 Inch Cap
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