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Since 1952
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Ford 9 Inch Posi Traction Third Member Assembly

SAME DAY SHIPPING! Most orders ship within 24 hours.

Specs
Sold in Quantity:
Each
Spline Count:
-
Ring Gear Weight:
Standard
Differential Type:
Limited Slip
Yoke Series:
1310
Housing Material:
Cast-Iron
Gear Ratio:
-
Ford 9 Inch Posi Traction Third Member Assembly

Click image to enlarge

Details

Reviews (28)

Q & A (32)

What's in the Box

Info

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 4.4 out of 5 by 28 reviewers.
RATING BREAKDOWN
28 reviews
5 Stars
20
4 Stars
4
3 Stars
2
2 Stars
0
1 Star
2
RECOMMEND THIS PRODUCT:

Bam
Verified Purchaser
Rio Rancho NM

Looks like a well built part

March 14, 2016
Couldn't have been any easier to install. Wish it came in a different color. Can't wait to see how it drives
Yes, I recommend this product.
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Too Tall
Verified Purchaser
High Springs, Fl.

PRODUCT CAME AS ADVERTISED, GOOD SHAPE

December 20, 2015
Product delivered on time and in good condition. Going in a 68 camaro pro street setup. Would have preffered it being a Flat black instead of the white. Other than that looks good.
Yes, I recommend this product.
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Tom
Verified Purchaser
Verified Reviewer
Oregon City, OR

9 inch Ford Rearend

December 19, 2015
The price is 50% better than others and it works great. Thanksgiving I took it for a test drive and did two 1st and 2nd burn offs and it did great. I then did a cookie and a drift worked great again, I am hoping it lasts for years to come.
Pros:
  • It Works Great
Yes, I recommend this product.
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CC
Verified Purchaser
Verified Reviewer
Scottsdale

Quiet as a church mouse

November 10, 2015
Quiet, perfect set up
Pros:
  • quick delivery
  • Neat Container Included
  • No Posi Chatter
  • Quiet
Yes, I recommend this product.
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stltoed
Cucamonga, Ca.

Very disappointed

August 16, 2015
I have 3.50 gears, thought this would be an easy way to check out 4.11. I got it in there easy enough, filled it, ran it in the air for a bit, and took off. I drove it to a birthday and broke it on the way home. No idea what happen. I kind see anything wrong, but its toast. I dig Speedway, but this sucked. $70 dollars in oil, $22 in gaskets... Not to happy right now
Cons:
  • The Case It Came Cool
No, I would not recommend this product.
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Merchant Response:

stltoed - Thanks for your feedback! We appreciate hearing from you. Your review has been passed along to our QC team to record and inspect the issue with this product. We are really sorry for your frustration and are always happy to help. The customer was contacted to make arrangements to get the 3rd member back for inspection.
Innovations Restorations
Verified Purchaser
Verified Reviewer
St. Louis, MO

Bolt in and go

August 09, 2015
Simple 20 minute swap. Nice piece!!! A+++ Second one I bought.
Yes, I recommend this product.
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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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Page 1 of 3

Product Q&A

32 questions : 35 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 4

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