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 7Likes
05-01-2016, 11:46 AM
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CC Member
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Join Date: Dec 2015
Location: N. Richland Hills,
TX
Cobra Make, Engine: Backdraft Racing, Roush 427
Posts: 40
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Not Ranked
Broken Diff
Yesterday I lost power to the back wheels. After I got the car pulled home and raising the car rear end , this the what I found..............Jeeze, what made this happen?? Do I need a whole new Diff and half shaft? Is this something I can do with limited experience with this type of suspension?
I would appreciate any suggestions.
Vance
Insert Photos and Images |
05-01-2016, 01:26 PM
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Senile Club Cobra Member
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Join Date: Feb 2001
Location: Buffalo, NY USA,
NY
Cobra Make, Engine: Time Machines Motorsports LLC- Superformance Dealer
Posts: 4,491
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Not Ranked
No pictures attached....
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05-01-2016, 02:01 PM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 21,909
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Not Ranked
Even without pictures, the general rule is "If it looks bad, it usually is." |
05-01-2016, 02:27 PM
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Senior CC Premier Member
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Join Date: Nov 2004
Location: SoCal,
CA
Cobra Make, Engine: CSX #4xxx with CSX 482; David Kee Toploader
Posts: 3,574
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Not Ranked
Quote:
Originally Posted by patrickt
Even without pictures, the general rule is "If it looks bad, it usually is." |
Yup. If you're talking broken diffs and half-shafts for sure! 
__________________
All that's stopping you now Son, is blind-raging fear.......
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05-01-2016, 03:55 PM
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CC Member
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Join Date: Dec 2001
Cobra Make, Engine: BDR
Posts: 536
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Well hard to say with out pictures, is it just a snapped half shaft or did you snap the casing too?
What were you doing when it failed?
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05-01-2016, 04:12 PM
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CC Member
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Join Date: Dec 2015
Location: N. Richland Hills,
TX
Cobra Make, Engine: Backdraft Racing, Roush 427
Posts: 40
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Not Ranked
Sorry about the pics....having a hard time getting them uploaded. I was driving maybe 40 mph in 4th gear and all hell broken loose....banging, thumping, bucking. What could cause the diff to break like this?
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05-01-2016, 04:18 PM
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CC Member
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Join Date: Dec 2001
Cobra Make, Engine: BDR
Posts: 536
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Not Ranked
Have you performed any healthy standing starts resulting in axle hop? Looks like you had a metal fatigue or fracture some how.
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05-01-2016, 04:29 PM
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Senior CC Premier Member
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Join Date: Nov 2004
Location: SoCal,
CA
Cobra Make, Engine: CSX #4xxx with CSX 482; David Kee Toploader
Posts: 3,574
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Looks like someone might have been doing some spirited starts or trying burnouts at some time, but I'm just making a guess.
There was a pic on this site a long time ago of a shaft twisted like a pretzel. I actually downloaded it and kept it for a long time to remind me what can happen, especially with sticky tyres. 
Can't find it anymore...
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All that's stopping you now Son, is blind-raging fear.......
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05-01-2016, 04:34 PM
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CC Member
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Join Date: Dec 2001
Cobra Make, Engine: BDR
Posts: 536
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Ya I snapped mine in half on the drag strip at launch back in 08, these rear IRS suspensions aren't really designed for the strip or hard launches.
It is better to snap a half shaft though than what the OP has. Rather replace a shaft than entire dif. or worse.
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05-01-2016, 04:46 PM
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Senior CC Premier Member
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Join Date: Nov 2004
Location: SoCal,
CA
Cobra Make, Engine: CSX #4xxx with CSX 482; David Kee Toploader
Posts: 3,574
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Bad things can happen fast in these cars. To the OP...Axel 427: you do have a scatter shield and a driveline safety hoop, right?
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All that's stopping you now Son, is blind-raging fear.......
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05-01-2016, 05:30 PM
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CC Member
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Join Date: Dec 2015
Location: N. Richland Hills,
TX
Cobra Make, Engine: Backdraft Racing, Roush 427
Posts: 40
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Yeah.... I know it looks like I was doing some hard launches, but I wasn't or haven't...
I bought this car used with 331 miles on the OD. I recently jacked the rear up to find why my speedo was working. One of the 2 wires on connector going to sender was not connected. Is it possible the way I lifted the rear to cause this? I jacked the right rear side up first putting support under tire then the same for left side. Dang..... what a chocolate mess!!!
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05-01-2016, 05:44 PM
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Senile Club Cobra Member
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Join Date: Feb 2001
Location: Buffalo, NY USA,
NY
Cobra Make, Engine: Time Machines Motorsports LLC- Superformance Dealer
Posts: 4,491
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[quote=Axel 427;1389681 What could cause the diff to break like this?[/QUOTE]
Umpteen thousand miles of use? You do know that the BDR diffs and suspension are used parts, right?
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05-01-2016, 05:52 PM
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Senile Club Cobra Member
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Join Date: Feb 2001
Location: Buffalo, NY USA,
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Cobra Make, Engine: Time Machines Motorsports LLC- Superformance Dealer
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Quote:
Originally Posted by Axel 427
Yeah.... I know it looks like I was doing some hard launches, but I wasn't or haven't...
I bought this car used with 331 miles on the OD. I recently jacked the rear up to find why my speedo was working. One of the 2 wires on connector going to sender was not connected. Is it possible the way I lifted the rear to cause this? I jacked the right rear side up first putting support under tire then the same for left side. Dang..... what a chocolate mess!!!
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No. Jacking will not cause a diff failure. Do not blame yourself.
And who sells a car with 331 miles? Why does someone buy a car and not drive it? I do not understand this. Be it BDR, SPF, ERA, Etc. What is he point of having a toy you do not use? Of course, if you know there is an issue and save the wear and tear for the next owner that is one explanation.
"One of the 2 wires on connector going to sender was not connected." And hat goes a long way in explaining why the miles showed "331"....there is a LOT more on the chassis but the odometer didn't work so TMU. |
05-01-2016, 06:01 PM
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CC Member
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Join Date: Aug 2013
Location: Haslet,
TX
Cobra Make, Engine: BDR #888, Keith Craft 408
Posts: 344
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Not Ranked
Vance,
Looks to me as if the 6 bolts holding the half shaft spacer backed out. When you install these everything (both diff flange female threads and the half shaft male threads) should be degreased and you should use thread locker and the torque bolts.
The broken part looks like the rear diff cover from the pic.... This is an easy part to replace. I am guessing half shaft came loose and since you were doing about 40mph the half shaft hit the diff cover ear with enough force to break it...
Yes, these are used parts and things break (I broke the R/H halfshaft at the Scottsdale, AZ Goodguys Autocross event in March). But unless you are on drag slicks / R Compound Tires / or just dropping the clutch at high RPM's things shouldn't be breaking.
Also, I'm over in Haslet... maybe 15 miles from you.... Now that Jay Nordstrom is no longer with us I guess I am the local BDR expert....
Pic is from Raleigh, NC Goodguys Autocross event two weeks ago.
Kevin.....
Last edited by Grey 65; 05-01-2016 at 06:14 PM..
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05-02-2016, 09:59 AM
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CC Member
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Join Date: Dec 2015
Location: N. Richland Hills,
TX
Cobra Make, Engine: Backdraft Racing, Roush 427
Posts: 40
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Not Ranked
No.... I did not know BDR installs used parts. You would think for the price of these cars all components would be new...... My speedo was working when I got the car. The more I think about it, I guess I was bent over when I bought this car. I hope I don't find more surprises down the road. Sh#t!!!!!!!!
Thanks for your replies
Vance
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05-02-2016, 10:12 AM
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CC Member
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Join Date: Dec 2011
Location: Voorhees,
NJ
Cobra Make, Engine: BDR #1230/B2 445CI SBF
Posts: 295
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I had a similar problem last year but I hard launched with super sticky tires on a not so smooth road (yes stupid). I think I have the front cover that you broke if you are interested. I upgraded to a Diffsonline Differential and hardened output shafts. Already had upgraded half shafts but you should get some of those too. Call me if you need any input, I did the job and it isn't so bad.
Gary 610 636 4574
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Gary Bowman
Voorhees NJ/Key Largo Fla/Ventnor NJ
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05-02-2016, 01:32 PM
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CC Member
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Join Date: Dec 2015
Location: N. Richland Hills,
TX
Cobra Make, Engine: Backdraft Racing, Roush 427
Posts: 40
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Not Ranked
Yes, I'm interested. I'm trying to a guy over here to look at it and hoping there's not to much parts to replace. I'll keep you and informed and thanks.
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05-24-2016, 11:26 AM
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CC Member
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Join Date: Nov 2013
Location: Keller,
TX
Cobra Make, Engine: ERA 806, KC 482 FE
Posts: 89
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Not Ranked
Did you ever get your car back together? What actually broke, the diff or just the cover?
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05-24-2016, 03:47 PM
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CC Member
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Join Date: Dec 2015
Location: N. Richland Hills,
TX
Cobra Make, Engine: Backdraft Racing, Roush 427
Posts: 40
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Not Ranked
Yep.....I got the rear end back together. Grey 65 was correct when he said "looks like the 6 bolts holding the half spacer back out." Kinda makes you wonder if these were torqued to begin with.The half shaft apparently hit the wing part of the Diff cover and broke it. I bought a new Diff cover and bolts, and gear oil and re-assembled. The car runs great now, except now I noticed transmission fluid leaking around the rear seal of the transmission. I'm not sure if the previous problem caused this............. Dang!!!!
How hard is this seal to change out ? Anyboby got suggestions?
Vance |
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