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 5Likes
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1
Post By eschaider
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1
Post By joyridin'
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Post By Gaz64
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2
Post By Cruisin428
08-26-2019, 11:22 AM
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CC Member
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Join Date: Jan 2018
Location: Copeville,
TX
Cobra Make, Engine: 1993 Excalibur Cobra, 351W 400hp+
Posts: 45
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Not Ranked
Ford 9 inch center section worn out
Have a Ford 9 inch positrac 28 spline 3.70 that has over 1/2 inch play in the ring and pinion. Upon inspection found that previous owner must have neglected the gear oil. Weighing new replacement vs rebuild. Need advice from members on which way to go. |
08-26-2019, 12:17 PM
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CC Member
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Join Date: Feb 2006
Location: Gilroy,
CA
Cobra Make, Engine: SPF 2291, Whipple Blown & Injected 4V ModMotor
Posts: 2,726
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Not Ranked
Just get a new ring & pinion and replace the bearings.
Ed
__________________
Help them do what they would have done if they had known what they could do.
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08-26-2019, 01:11 PM
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CC Member
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Join Date: Aug 2010
Location: San Antonio Valley Ca,
ca
Cobra Make, Engine:
Posts: 1,275
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Not Ranked
Rebuilt is a custom hands on unit. Most any rear end shop will have the parts on the shelf.
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08-26-2019, 02:24 PM
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CC Member
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Join Date: Jan 2018
Location: Copeville,
TX
Cobra Make, Engine: 1993 Excalibur Cobra, 351W 400hp+
Posts: 45
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Not Ranked
What is everyone's opinion of Speedway Motors regarding their rebuilt 3rd members? They are advertising 9 Inch Ford Third Member posi Assembly, 28 Spline, 3.70:1 $899.99 reduced from $1,199.99 rebuilt with a Currie CE-4026C Ford "N" nodular iron carrier housing and then install bearings, seals, a heavy duty "Daytona" pinion support, a 1310-series yoke. After applying promo code the price is reduced to $675. What do you think?
Last edited by TX-Excalibur; 08-26-2019 at 02:59 PM..
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08-26-2019, 02:36 PM
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CC Member
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Join Date: Jan 2012
Location: Katy,
Tx
Cobra Make, Engine: ERA#134 427 Ctr oiler 2x4's
Posts: 51
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Not Ranked
Sounds like a screaming deal! I'd go for it.
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08-26-2019, 02:40 PM
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CC Member
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Join Date: Jan 2018
Location: Copeville,
TX
Cobra Make, Engine: 1993 Excalibur Cobra, 351W 400hp+
Posts: 45
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Not Ranked
Thanks eschaider, I would love to do this myself but I am not setup for it and will have to depend on a shop to do the rebuild. One place quoted me $1500 parts and labor which made me look more into replacing the unit as an assembly.
Last edited by TX-Excalibur; 08-26-2019 at 02:46 PM..
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08-26-2019, 05:02 PM
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CC Member
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Join Date: Feb 2006
Location: Gilroy,
CA
Cobra Make, Engine: SPF 2291, Whipple Blown & Injected 4V ModMotor
Posts: 2,726
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Not Ranked
You're getting ripped off!
Go check the price of ring & pinions from Strange, Ford etc on Summit. Price out bearings, gaskets and seals are cheap. Ask around and a couple hundred dollars would be highway robbery for setup.
The alternative is learn how to do it yourself. Buying parts and tools for yourself would be waaaaaay less expensive.
I have a short 6 page pdf file that will show you how but unbelievably it is too big to upload to the site. PM me an email address and I will send it to you.
Alternatively, write a check bigger than you want to.
Ed
__________________
Help them do what they would have done if they had known what they could do.
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08-27-2019, 04:45 PM
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CC Member
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Join Date: Feb 2009
Posts: 1,695
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Not Ranked
Quote:
Originally Posted by TX-Excalibur
What is everyone's opinion of Speedway Motors regarding their rebuilt 3rd members? They are advertising 9 Inch Ford Third Member posi Assembly, 28 Spline, 3.70:1 $899.99 reduced from $1,199.99 rebuilt with a Currie CE-4026C Ford "N" nodular iron carrier housing and then install bearings, seals, a heavy duty "Daytona" pinion support, a 1310-series yoke. After applying promo code the price is reduced to $675. What do you think?
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Sounds like a really good deal! For the price that it would cost you to do it yourself, just buy the unit.
Last edited by joyridin'; 08-28-2019 at 05:32 AM..
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08-27-2019, 05:54 PM
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CC Member
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Join Date: May 2008
Location: Brisbane,
QLD
Cobra Make, Engine:
Posts: 2,797
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Not Ranked
Quote:
Originally Posted by joyridin'
Sounds like a really good deal! For the price that is would cost you to do it yourself, just buy the unit.
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That is a good deal. Jump on it.
Gary |
08-28-2019, 06:38 AM
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CC Member
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Join Date: Jun 2017
Location: Sacramento,
Ca
Cobra Make, Engine: FFR 347
Posts: 38
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Not Ranked
Ring and pinion 200.
Bearings and seals 150.
Posi 300.
Upgraded case 300.
Shop to put it together 200.
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Speedway looks good!
Last edited by Cruisin428; 08-28-2019 at 06:41 AM..
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08-30-2019, 07:47 AM
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CC Member
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Join Date: Jan 2018
Location: Copeville,
TX
Cobra Make, Engine: 1993 Excalibur Cobra, 351W 400hp+
Posts: 45
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Not Ranked
Quote:
Originally Posted by Cruisin428
Ring and pinion 200.
Bearings and seals 150.
Posi 300.
Upgraded case 300.
Shop to put it together 200.
.............
Speedway looks good!
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When I estimated the cost to do it myself your prices were pretty much in line with mine with only the labor quote of $500 being the difference. I went ahead and ordered the Speedway unit and it arrived Wednesday. I spent yesterday removing the old unit and plan to install the replacement unit today. I will be looking to sell the old unit for $300.
Last edited by TX-Excalibur; 08-30-2019 at 07:51 AM..
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08-31-2019, 08:02 PM
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CC Member
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Join Date: Dec 2017
Location: Farmersville,
Tx
Cobra Make, Engine: 302. 1992 build
Posts: 247
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Not Ranked
Rear end
Gary, if you need any help let me know .
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09-01-2019, 07:00 AM
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CC Member
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Join Date: Jan 2018
Location: Copeville,
TX
Cobra Make, Engine: 1993 Excalibur Cobra, 351W 400hp+
Posts: 45
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Not Ranked
Quote:
Originally Posted by Bulldog
Gary, if you need any help let me know .
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Thanks Charles, I have ordered a transmission jack to support the weight of the assembly until I am able to get it into position. When it arrives I will give you a call and see if you are available. The nodular case is a lot heavier than the standard case that came out. |
09-01-2019, 10:25 AM
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CC Member
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Join Date: Feb 2014
Location: White City,
SK
Cobra Make, Engine: West Coast, 460 CID
Posts: 2,908
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Not Ranked
Quote:
Originally Posted by TX-Excalibur
Thanks Charles, I have ordered a transmission jack to support the weight of the assembly until I am able to get it into position. When it arrives I will give you a call and see if you are available. The nodular case is a lot heavier than the standard case that came out.
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Speedway lists the nodular case assembly as the same weight as a regular case. Regardless - 78.55 pounds is a bit of work and no fun when you're laying on your back and trying to get it into position. Ask me how I know. LOL
I see that unit comes with a Richmond Powertrax Grip Pro differential, which they refer to as 'limited slip'. I'm sure you're already aware, but this is a helical gear torque-sensing differential, and the same unit I've been running for about 4 years. FWIW I think it's really good, and a great choice for a Cobra. BTW, I'm running Redline Synthetic SHOCKPROOF® gear oil in mine as there are no clutch packs to worry about.
__________________
Brian
Last edited by cycleguy55; 09-01-2019 at 10:34 AM..
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09-01-2019, 10:31 AM
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CC Member
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Join Date: Feb 2014
Location: White City,
SK
Cobra Make, Engine: West Coast, 460 CID
Posts: 2,908
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Not Ranked
Quote:
Originally Posted by TX-Excalibur
Have a Ford 9 inch positrac 28 spline 3.70 that has over 1/2 inch play in the ring and pinion. Upon inspection found that previous owner must have neglected the gear oil. Weighing new replacement vs rebuild. Need advice from members on which way to go. |
While I recognize 'positrac' has become a generic term for a limited slip differential, it's really a term for GM's "Positraction" LS differentials.
Ford used 'Traction-Lok' or 'Trac-Lok' as their term for clutch pack type limited slip differentials. An earlier LS differential from Ford was 'Equa-Lock'.
__________________
Brian
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09-02-2019, 09:18 AM
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CC Member
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Join Date: Jan 2018
Location: Copeville,
TX
Cobra Make, Engine: 1993 Excalibur Cobra, 351W 400hp+
Posts: 45
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Not Ranked
Quote:
Originally Posted by cycleguy55
Speedway lists the nodular case assembly as the same weight as a regular case. Regardless - 78.55 pounds is a bit of work and no fun when you're laying on your back and trying to get it into position. Ask me how I know. LOL
I see that unit comes with a Richmond Powertrax Grip Pro differential, which they refer to as 'limited slip'. I'm sure you're already aware, but this is a helical gear torque-sensing differential, and the same unit I've been running for about 4 years. FWIW I think it's really good, and a great choice for a Cobra. BTW, I'm running Redline Synthetic SHOCKPROOF® gear oil in mine as there are no clutch packs to worry about. |
Thanks cycleguy55, the 78.55 lbs weight made me curious as I noticed a definite difference between the two assemblies. So I weighed them both to satisfy my curiosity and found that the rebuilt assembly with the nodular case weighed about 7 lbs more than the old assembly. It may not seem like much but when you are trying to lift that baby into position using only your arm strength, for me it was noticeably heavier.
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09-02-2019, 04:35 PM
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CC Member
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Join Date: Feb 2014
Location: White City,
SK
Cobra Make, Engine: West Coast, 460 CID
Posts: 2,908
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Not Ranked
Quote:
Originally Posted by TX-Excalibur
Thanks cycleguy55, the 78.55 lbs weight made me curious as I noticed a definite difference between the two assemblies. So I weighed them both to satisfy my curiosity and found that the rebuilt assembly with the nodular case weighed about 7 lbs more than the old assembly. It may not seem like much but when you are trying to lift that baby into position using only your arm strength, for me it was noticeably heavier.
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What, a vendor's listings and specifications aren't 100% accurate? I'm shocked. 
I've installed a 9" center section a couple of times using nothing but arm strength, and neither installation was a lot of fun.
__________________
Brian
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09-02-2019, 05:24 PM
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CC Member
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Join Date: May 2008
Location: Brisbane,
QLD
Cobra Make, Engine:
Posts: 2,797
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Not Ranked
Quote:
Originally Posted by cycleguy55
What, a vendor's listings and specifications aren't 100% accurate? I'm shocked.
I've installed a 9" center section a couple of times using nothing but arm strength, and neither installation was a lot of fun. |
Yes, they are heavy, especially on your own, almost as heavy as some transmissions.
So much fun having a diff centre or trans sit on your chest.
Gary |
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