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Founder, 1929-2014
Speedy Bill
Since 1952
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America's Oldest Speed Shop ®

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Ford 9 Inch Posi Traction Third Member Assembly

SAME DAY SHIPPING! Order within the next 14 hours 24 minutes and receive same day 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 Currie 9-Plus limited slip 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 :

  • 91044090 - for street and every day driving under normal conditions
  • 91044140 -  for extreme duty, towing, or very hot climates

Currie Differential Tech Bulletin (PDF)

Instructions (PDF)

Customer Reviews

Rated 4.3 out of 5 by 16 reviewers.
RATING BREAKDOWN
16 reviews
5 Stars
10
4 Stars
3
3 Stars
2
2 Stars
0
1 Star
1
RECOMMEND THIS PRODUCT:

bigbro
Verified Purchaser
Hemet, CA, USA
Product Rating

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
Product Rating

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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36buickthreewindow
Verified Purchaser
Saint Louis, MO, USA
Product Rating

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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KenN8405T
Verified Purchaser
Phoenix Arizona
Product Rating

Plug and Play

June 03, 2014
Took out my old worn 3rd member, bolted in the new Posi. Slid in the axles and 4 hours later I was done and driving. The new 9 inch Posi has a real nice feel. Compared to my old straight 2.35 gears, my new 3.70 with the Posi, really tracks nice. You can really feel it in a powered turn.
Pros:
  • Plug and Play
Yes, I recommend this product.
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billyb77
Oswego, IL, USA
Product Rating

Great Value!

December 25, 2013
Bought this for my 32 Ford 5 window Street Rod. Painted and installed it. I priced a few other vendors and no one could touch the price. I also received $7.99 shipping during special promotion. No issues, preforms Great! Great value!
Pros:
  • Great Value
Cons:
  • None
Yes, I recommend this product.
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crawfcustm
Verified Purchaser
Herculaneum, MO, USA
Product Rating

Great value for quality product

January 18, 2013
I bought this 3rd member because my buddy put one in his street rod, and performed great; with no issues. Mine is in my street rod and hope to have it running during the next year. I'm anxious to comment on the performance when my car is done. The options, quality components, fast and reasonable shipping, and based on my buddies' performance; I believe I got the best deal from Speedway.
Yes, I recommend this product.
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Todd
Verified Purchaser
TN
Product Rating

Good product for the money

November 17, 2012
This product arrived fast and was exactly what the ad described!!!
Yes, I recommend this product.
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Buck
Verified Purchaser
parkville MO
Product Rating

Great part works perfect

February 08, 2011
[...]
Pros:
  • Easy To Install
Yes, I recommend this product.
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Switchblade
Verified Purchaser
Ventura ca
Product Rating

It was clean inside and out great parts

May 27, 2012
This came to my house in shipping container that protected it very well. It is clean and put together with great parts. You could not find a better one for the price. I tried.
Pros:
  • Easy To Install
  • Improves Launching
Yes, I recommend this product.
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John
Crestline, Ohio
Product Rating

Very Nice Product, World Class Price

December 26, 2010
This went into a 1946 Chevy Truck Rod, with a four link narrowed 9. Ready and primed, my exsperience with Speedway is great, and I live 45 min. from both Jegs, and Summit, and I went with Speedway, with no regrets to date.
Pros:
  • Nice container
  • Price
  • Ready To Use
Yes, I recommend this product.
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Page 1 of 2

Product Q&A

25 questions : 28 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?

1 answers
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.

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?

1 answers
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.

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?

1 answers
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"

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

2 answers
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.

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

1 answers
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.

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?

2 answers
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.

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

1 answers
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.

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

1 answers
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.

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?

1 answers
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.

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

1 answers
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

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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:

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Lubrication Engineers SAE 90 Weight Gear Oil, 1 Gallon
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How to Measure Your Housing Tech Tip (Link)

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