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5Likes
02-26-2014, 05:06 PM
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CC Member
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Join Date: Jul 2010
Location: McMurray,
PA
Cobra Make, Engine: Superformance #522
Posts: 528
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Not Ranked
31 Spline Halfshaft Upgrade
Changing out the existing T Bird 28 spline halfshafts to 30-04 Mustang Cobra halfshafts. These are brand new from Ford. I will reuse the existing 36 spline center bars. I'll post more here as I get free time. Carrier will be a TrueTrac and bushings will be solid aluminum (front and rear).
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02-26-2014, 05:54 PM
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CC Member
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Join Date: Nov 2012
Location: endicott,
ny
Cobra Make, Engine: SPF
Posts: 339
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Not Ranked
Thanks for starting this thread. Ahead of me will be my first full summer with my SPF... and I am mentally checking off things .....that 'may be' coming my way.
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02-26-2014, 09:20 PM
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CC Member
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Join Date: Apr 2005
Location: Tucson,
AZ
Cobra Make, Engine:
Posts: 5,391
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I have the same thing except I used the 04 aluminum differential and opted for 300M center shafts. Really strong!
Larry
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Alba gu brąth
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02-27-2014, 01:58 AM
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CC Member
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Join Date: Jul 2010
Location: McMurray,
PA
Cobra Make, Engine: Superformance #522
Posts: 528
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Not Ranked
Quote:
Originally Posted by LMH
I have the same thing except I used the 04 aluminum differential and opted for 300M center shafts. Really strong!
Larry
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I considered using 4340 center bars, but has anyone broken the stock ones? The 4340 center bars are $460 from driveshaft shop.
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02-27-2014, 07:07 AM
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CC Member
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Join Date: Apr 2005
Location: Tucson,
AZ
Cobra Make, Engine:
Posts: 5,391
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I did read of a couple FFR guys shearing the axle off at the CV joint but I don't recall what the circumstances were. Could have been drag racing with slicks for all I know.
I just went ahead and had them installed since I had already shipped my CV joints to the DSS. It was expensive though!
Larry
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Alba gu brąth
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02-27-2014, 07:11 AM
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CC Member
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Join Date: Apr 2005
Location: Tucson,
AZ
Cobra Make, Engine:
Posts: 5,391
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I'm not exactly sure how SPF mounts their differential but if it uses the cast mount on the aluminum diff cover, you might want to consider a stronger cover. The OEM Ford cover on their differential is a weak point.
Larry
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Alba gu brąth
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02-27-2014, 03:36 PM
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CC Member
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Join Date: Aug 2012
Location: Valley Forge,
PA
Cobra Make, Engine: Superformance -Roush 427R
Posts: 24
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Not Ranked
I broke the right axel at the Hub, after the CV.
For once I was not beating the Hell out of the Beast, just moving in 40MPH traffic. I went for slight acceleration and nothing but an increase in RPM.
Replaced it with an Olthoff HD replacement and the beatings continue.
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02-28-2014, 05:01 AM
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CC Member
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Join Date: Jul 2010
Location: McMurray,
PA
Cobra Make, Engine: Superformance #522
Posts: 528
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Not Ranked
Quote:
Originally Posted by vatdevil
Changing out the existing T Bird 28 spline halfshafts to 30-04 Mustang Cobra halfshafts. These are brand new from Ford. I will reuse the existing 36 spline center bars. I'll post more here as I get free time. Carrier will be a TrueTrac and bushings will be solid aluminum (front and rear).
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Ford part number is 2R3Z4K138AA and cost is around $650 pair. Ford recently put these back into production. Generally good up to 550 RWHP on a much heavier Mustang.
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03-29-2014, 04:38 AM
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CC Member
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Join Date: Jul 2010
Location: McMurray,
PA
Cobra Make, Engine: Superformance #522
Posts: 528
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Not Ranked
Eaton Ford 8.8 31 spline Truetrac (913A561)
Ford Cobra IRS differential girdle (M-4033-G3)
Ford IRS bearings and seals (M-4413-A)
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03-29-2014, 04:50 AM
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CC Member
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Join Date: Feb 2014
Location: Grand Rapids,
MI
Cobra Make, Engine: Superformance #1309 www.spfowners.freeforums.net
Posts: 524
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So I'm guessing a lot of people are having the stock ones fail?
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03-29-2014, 04:56 AM
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CC Member
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Join Date: Jul 2010
Location: McMurray,
PA
Cobra Make, Engine: Superformance #522
Posts: 528
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Solid mounts from Craigs Cobras
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03-29-2014, 05:02 AM
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CC Member
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Join Date: Jul 2010
Location: McMurray,
PA
Cobra Make, Engine: Superformance #522
Posts: 528
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Quote:
Originally Posted by buddyg
So I'm guessing a lot of people are having the stock ones fail?
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Some yes. But thats not the main reason for my upgrading. I want the performace gain of the Truetrac and to eliminate wheel hop (solid mounts). Upgrading the halfshafts just seemed logical to do with other changes.
I will also convert the back mount to solid. Pic to follow when complete.
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03-29-2014, 06:27 AM
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CC Member
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Join Date: Jun 2005
Cobra Make, Engine:
Posts: 3,077
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I have beaten the living sheet out of all my SPF with more than 500hp never had any issues. I average 2k miles on a set of rear tires. The SPF suspension is max proof!
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03-29-2014, 01:04 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
8.8 Diff Cover
If you search around you might be able to find one of these 8.8 covers. They are machined from billet and are about as close to indestructible as you can get. There are provisions for an oil cooler and all kinds of other nice to have stuff.
Ed
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Help them do what they would have done if they had known what they could do.
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03-29-2014, 02:12 PM
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CC Member
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Join Date: Nov 2012
Location: endicott,
ny
Cobra Make, Engine: SPF
Posts: 339
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Good groceries that is pretty.
Besides being tapped for coolers. Does the covers on these rears stand to have the reinforcement beef to it? Is this a week point?
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03-29-2014, 03:21 PM
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Join Date: Jul 2010
Location: McMurray,
PA
Cobra Make, Engine: Superformance #522
Posts: 528
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Quote:
Originally Posted by blown871
Good groceries that is pretty.
Besides being tapped for coolers. Does the covers on these rears stand to have the reinforcement beef to it? Is this a week point?
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Yes ....I've seen a number of them break to pieces on Mustangs. The Ford Racing upgrade is cast aluminum and quite a bit stronger than the original crap. It has load bolts for the bearing caps and built in full/drain plugs. Thickness is 1/2 to 3/4 inch.
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03-29-2014, 04:27 PM
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CC Member
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Join Date: Apr 2005
Location: Tucson,
AZ
Cobra Make, Engine:
Posts: 5,391
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The production Ford cover on the 8.8" IRS differential is very thin. Combine that with rubber or other non-solid front mounts and solidly mounted rear, it's a recipe for disaster. The aftermarket covers or the FMS covers are much stronger. LPW makes a nice cover.
Larry
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Alba gu brąth
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03-29-2014, 04:34 PM
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CC Member
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Join Date: Nov 2012
Location: endicott,
ny
Cobra Make, Engine: SPF
Posts: 339
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Not Ranked
Wow; thanks for the schooling. I have had my head into Chevys my whole life and now... the light has shined down upon me.
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03-29-2014, 06:00 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
Quote:
Originally Posted by blown871
Good groceries that is pretty.
Besides being tapped for coolers. Does the covers on these rears stand to have the reinforcement beef to it? Is this a week point?
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This is a weak point as several have already mentioned. This is what the broken version of the OEM cover looks like;
The cover on the left is an early billet replacement that the original provider has stopped producing. If you like the billet cover in post #14 above it could probably be made again however, the setup headache puts the minimum order quantity around a dozen pieces to get a shop interested.
Ed
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Help them do what they would have done if they had known what they could do.
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03-30-2014, 02:38 PM
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CC Member
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Join Date: Feb 2014
Location: Grand Rapids,
MI
Cobra Make, Engine: Superformance #1309 www.spfowners.freeforums.net
Posts: 524
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Not Ranked
Quote:
Originally Posted by eschaider
If you search around you might be able to find one of these 8.8 covers. They are machined from billet and are about as close to indestructible as you can get. There are provisions for an oil cooler and all kinds of other nice to have stuff.
Ed
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Dang that is purdy!
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