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Speedway Ford 9 Inch Posi Traction Third Member Assembly

Specs
Sold in Quantity:
Each
Spline Count:
-
Ring Gear Weight:
Standard
Differential Type:
Limited Slip
Yoke Series:
1310
Housing Material:
Cast-Iron
Gear Ratio:
-
Weight:
31.8
Speedway Ford 9 Inch Posi Traction Third Member Assembly
Speedway Ford 9 Inch Posi Traction Third Member Assembly
Speedway Ford 9 Inch Posi Traction Third Member Assembly
Speedway Ford 9 Inch Posi Traction Third Member Assembly
Speedway Ford 9 Inch Posi Traction Third Member Assembly

Click image to enlarge

Details

Reviews (37)

Q & A (31)

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, muscle car or truck. We start with a new carrier housing and then install bearings, seals, a heavy duty "Daytona" pinion support, a 1310-series yoke, and your choice of ring-and-pinion ratios. 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 limited slip differential available in 28 or 31 spline axle shaft configurations. This helical gear differential is perfect for light-to-medium weight street vehicles where one wants posi-action without the adverse handling effects or noise of a full locker. Because there are no friction plates, there is no friction modifier additive necessary.

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.

Instructions (PDF)

Notes

Gear lube recommendations :

910-44090 - For street and every day driving under normal conditions

910-44140 - For extreme duty, towing or very hot climates

Warranties

No warranty is offered for commercial, off road, street performance, or racing use.

Customer Reviews

Rated 4.5 out of 5 by 37 reviewers.
RATING BREAKDOWN
37 reviews
5 Stars
28
4 Stars
4
3 Stars
3
2 Stars
0
1 Star
2
RECOMMEND THIS PRODUCT:

Skibum49
Verified Purchaser
Tacoma, WA

perfect fit

August 24, 2016
This is going into a Deluxe T bucket kit. (" rear end is probably over kill but what I won't have to worry about breaking it.
Pros:
  • Axles Slide Right In
  • Ease Of Installation
Cons:
  • Paint In The U Joint Cup
Yes, I recommend this product.
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Cougar
Verified Purchaser
Verified Reviewer
Fleetwood, PA

Putting Power Down

August 03, 2016
Speedway has a great system for delivering quality products. They think through the details. This rear puts the power to the pavement. I am confident in it.
Pros:
  • Easy To Order
  • Well Packaged
  • Cleanly Finished
Yes, I recommend this product.
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RON
Verified Purchaser
Verified Reviewer
Ashburnham, Ma

INEXPENSIVE 9" THIRD MEMBER

July 26, 2016
Very reasonable and cost conscious. It didn't have the super strong housing but I do not plan to race my car. Even if I do I'm confident the rear end will hold up well.
Pros:
  • St More To Rebld Mine
  • Very Reasonable--would Co
Yes, I recommend this product.
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JHK
Verified Purchaser
Verified Reviewer
San Antonio, TX

Nice Third Member for the money

June 21, 2016
Everything seemed in order with unit, gear pattern was adjusted correctly out of box. For the money it seems to be a great third member.
Pros:
  • Assembled Well
  • Quick Deliver
  • Adjusted Correctly
Cons:
  • None Yet
Yes, I recommend this product.
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Rat Rod Relics
Verified Purchaser
Verified Reviewer
Michigan

Can't wait to get it on the road!

June 15, 2016
Fast shipping. I recieved it quicker than expected. Very easy to install. It was everything that I expected. Nice product. Great value.
Pros:
  • Looks Great
  • Easy To Install
Yes, I recommend this product.
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Bobo
Verified Purchaser
Verified Reviewer
Hilton, Ny

best one for the price

June 09, 2016
Nice and smooth, no chatter
Yes, I recommend this product.
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Karnut
Verified Purchaser
Verified Reviewer
Florida

Speedway Posi Third Member Assembly

June 04, 2016
Simple swap. I like the Richmond Grip Pro carrier. No clutches to deal with. It uses gears in the carrier. Quit operations no noise when turning corners. Includes new gear, carrier and 1310 yoke. The best deal I found on the internet for a 31 spline third member.
Yes, I recommend this product.
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builder
Verified Purchaser
Verified Reviewer
Clermont NY

Excellent performancee at a fair price

May 13, 2016
I put this third member behind a 347 Stroker motor and it makes driving a Blast !!
Yes, I recommend this product.
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Olin Yarberry
Verified Reviewer
Chandler, Az

9 inch 411

March 24, 2016
Bought this in OCT 2015, installed in early NoV. Filled with 85-140w Lucas gear oil, almost 3 qt to where it comes out of service hole. Took it easy on the gears first 300 miles like instructions say. Took it on a cruise in Feb about 20 miles one way, and it started trowing fluid out of the 3ft vent tube all over the bottom of the car. Cleaned it up filled it back up. Drove it home, did the same thing again. The center section was pretty hot. So I cruised it around town some more to let it break in. Now I have about 400 miles. Took it on another cruise again about 20 miles, threw fluid again, cleaned up, drove home, threw fluid again. Called customer support on Monday 03/21/16 asked for some advice from tech. (Craig) he asked me why I was using heavy oil, said that is what instructions say. Told me to switch to lighter weight. So I have changed to 75-90 Lucas. Craig said he would call me back to look further more into the problem. Never called back. It is noisy on decel, I guess it's not a big deal, is not the first noisy 9 inch I have bought.
Pros:
  • Case
  • Company
  • Easy Install
  • Price
Cons:
  • Hot
  • Noisy
Yes, I recommend this product.
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Merchant Response:

Thank you for your feedback, we're very to hear about the trouble you've had with this third member. A member of our Customer Service Team has contacted you to assist. It sounds like you're generating internal pressure after the assembly comes to temperature. For this unique problem, you may consider adding a rear axle breather, such as our P# 91045840 or similar. All of our third members offer a one year warranty for street applications, and our Customer Service Team is here to assist!
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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Page 1 of 4

Product Q&A

31 questions : 33 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"
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

Is this available with a 3:00 gear ratio?

Motogeezer
Atascadero, CA, USA
February 12, 2014

Is this available with a 3:00 gear ratio?

Answers

February 12, 2014
EricM
Sorry it is not. 3:50 gear ratio is as far as I have available.
2 answers

Does the housing have a drain/top off plug?

Olie
Huntsville, AL, USA
February 09, 2014

Does the housing have a drain/top off plug?

Answers

January 28, 2015
36buickthreewindow
Yes it does
February 10, 2014
EricM
There is not a drain plug in this third member. There is a fill plug in it like all 9" third members. On a 9" Ford there is sometimes a drain plug in the bottom of the housing (this is rare in stock housings however) but the third member never has a drain plug in it.
Page 1 of 4

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