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05-09-2010, 07:57 AM
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CC Member
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Join Date: Nov 2009
Location: Clayton,
NC
Cobra Make, Engine: BackDraft Racing 351W bored and stroked to 427 hydraulic full roller
Posts: 54
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Not Ranked
Drive shaft and diff flange
Does anyone have a source for the drive shaft and the flange that mounts it to the diff? I broke the rear u-joint yesterday and need to replace both due to the carnage. Thanks.
Dave
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05-09-2010, 08:15 AM
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CC Member
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Join Date: Nov 2009
Location: Clayton,
NC
Cobra Make, Engine: BackDraft Racing 351W bored and stroked to 427 hydraulic full roller
Posts: 54
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Not Ranked
Quote:
Originally Posted by mln385
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Yeah I was looking at that thread but it looks like the GP is for the half shafts not the drive shaft. I plan on calling the Drive Shaft Shop on tomorrow as I have one of their shafts in the Vette and it's a sturdy unit. I just wasn't sure if they would have the flange that I need because it's beat up pretty bad too. Thanks.
Dave |
05-09-2010, 08:20 AM
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Backdraft Racing Dealer
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Join Date: Dec 2004
Location: North Haven,
CT
Cobra Make, Engine: Backdraft Racing
Posts: 5,121
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Not Ranked
You need a E36 BMW on one end and the other end will be dictated by your transmssion.
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05-09-2010, 08:22 AM
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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
Sorry mis-understood the post. Try them and let us know for future refrence for others.
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05-09-2010, 08:24 AM
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CC Member
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Join Date: Nov 2009
Location: Clayton,
NC
Cobra Make, Engine: BackDraft Racing 351W bored and stroked to 427 hydraulic full roller
Posts: 54
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Not Ranked
Quote:
Originally Posted by Cashburn
You need a E36 BMW on one end and the other end will be dictated by your transmssion.
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Okay I'll try Turner Motorsports for the pinion yoke and get the Drive Shaft shop to cut me a new shaft. Does anyone have any better ideas for either part? Thanks.
Dave |
05-09-2010, 08:26 AM
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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
If you know the transmission output shaft specs perhaps Reg can provide a replacement out of Florida with all the info.
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05-09-2010, 08:28 AM
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CC Member
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Join Date: Nov 2009
Location: Clayton,
NC
Cobra Make, Engine: BackDraft Racing 351W bored and stroked to 427 hydraulic full roller
Posts: 54
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Not Ranked
Quote:
Originally Posted by mln385
If you know the transmission output shaft specs perhaps Reg can provide a replacement out of Florida with all the info.
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The yoke from the tranny is okay it's just a standard Tremec yoke. It looks like I'm going to have to call Reg. Next question it seems every time I call BDR I never hear back from them. Anyone else have this problem? Thanks.
Dave |
05-09-2010, 08:31 AM
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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
Call both the driveshaft shop and Reg Monday see which is the better option.
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05-09-2010, 08:58 PM
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CC Member
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Join Date: Aug 2003
Location: San Diego,
CA
Cobra Make, Engine: BDR #455, KC427W, TWM-FI
Posts: 727
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Not Ranked
Call these guys. East County Drive Shaft (619) 447-3336. They are in San Diego. I had them shorten my driveshaft and make it stronger. They installed beefed up u-joints. I want to say the back one was from a toyota (metric) same size as the bimmer but stronger. Front was replaced with something stronger.
Cost was ~$200, took a day.
His shop is down the street from an old cobra builder/mechanic so he has done many in the past.
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05-10-2010, 02:05 PM
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CC Member
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Join Date: Nov 2009
Location: Clayton,
NC
Cobra Make, Engine: BackDraft Racing 351W bored and stroked to 427 hydraulic full roller
Posts: 54
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Not Ranked
Reg and Craig at BDR were more than helpful this morning and hopefully in a few days I'll be back together!
Dave
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05-10-2010, 03:11 PM
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Senior Club Cobra Member
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Join Date: May 2005
Location: Glendale,
CA
Cobra Make, Engine: Backdraft #395 from Vintage Motorsports; Valley Ford Specialist 487 FE with a TKO600
Posts: 498
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Not Ranked
Stop doing 5,000 RPM clutch dumps and your problems should go away.  |
05-10-2010, 06:47 PM
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CC Member
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Join Date: Nov 2009
Location: Clayton,
NC
Cobra Make, Engine: BackDraft Racing 351W bored and stroked to 427 hydraulic full roller
Posts: 54
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Not Ranked
Quote:
Originally Posted by Dinobyte
Stop doing 5,000 RPM clutch dumps and your problems should go away. |
You must be on the Corvette Forum somewhere and know what I do to my 66 LOL
Actually in the Cobra I've been very careful as I'm fearful of the E36 rearend grenading. The u-joint failed at about 25 mph and about 3k rpm. The u-joint lacked grease thus the failure. I did put the bracket on you suggested from Autowerx, it's a nice piece.
On a related note I spoke to the Drive Shaft Shop here in NC and they do offer a upgraded yoke for the E36 diff with a larger u-joint for the BMW. However it's a bit pricey for a new yoke and driveshaft at $650.....
Dave |
10-27-2010, 06:23 PM
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CC Member
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Join Date: Oct 2010
Cobra Make, Engine:
Posts: 3
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Not Ranked
I know this is an older post, but noticed you said it was caused by lack of grease.
A u-joint can also fail from not having any driveline angle. It will flatspot the rollers in the joint, and cause failure.
Just something to check to make sure!!
Will
__________________
-'94 Mustang GT 40k miles--- SOLD - want a cobra 
-Single Turbo/six speed. 484/550 at the tires
-'05 1200R Sportster
-Racing orange/cream, pipes and drag bars
-'07 Rancher 420
-26" ITP mud lites on ITP wheels
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10-27-2010, 06:42 PM
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Senior Club Cobra Member
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Join Date: Jul 2002
Cobra Make, Engine:
Posts: 15,712
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Not Ranked
I wonder what the typical BDR guy is running for rear tires? I cannot get enough traction with street tires to ever worry about breaking anything. Horse power is not the issue, if you can't hook it up, it don't matter how much you got.
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10-27-2010, 08:46 PM
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Backdraft Racing Dealer
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Join Date: Dec 2004
Location: North Haven,
CT
Cobra Make, Engine: Backdraft Racing
Posts: 5,121
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Not Ranked
Quote:
Originally Posted by Excaliber
I wonder what the typical BDR guy is running for rear tires? I cannot get enough traction with street tires to ever worry about breaking anything. Horse power is not the issue, if you can't hook it up, it don't matter how much you got.
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70% are on their first set of 17" 315-35 Eagles. |
11-07-2010, 07:23 PM
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CC Member
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Join Date: Nov 2009
Location: Clayton,
NC
Cobra Make, Engine: BackDraft Racing 351W bored and stroked to 427 hydraulic full roller
Posts: 54
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Not Ranked
Quote:
Originally Posted by Teal94Gt
I know this is an older post, but noticed you said it was caused by lack of grease.
A u-joint can also fail from not having any driveline angle. It will flatspot the rollers in the joint, and cause failure.
Just something to check to make sure!!
Will
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Will great point, I don't think it's the case in this situation though due to the lack of grease. The bearing caps were bone dry unfortunately. |
11-08-2010, 03:39 AM
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CC Member
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Join Date: Oct 2006
Location: Virginia Beach,
va
Cobra Make, Engine: BDR #250
Posts: 234
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Not Ranked
Hitch,
The E36 diff is surprisingly robust. I have had mine to the drag strip and RR it regularly with a junk yard LSD i installed, that I paid $100 for. My motor makes 495 rwhp, now I don't dump the clutch at 2500 either. But so far, knock on wood I haven't had any problems with the diff, drive shaft or the half shafts. Some have had problems with the half shafts but I haven't. Did you get any damage to the drive shaft tunnel when it let go? Or did the safety loop contain it?
Excaliber,
The standard rear tires are Nitto Drag Radials....Mac
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11-08-2010, 07:23 PM
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CC Member
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Join Date: Nov 2009
Location: Clayton,
NC
Cobra Make, Engine: BackDraft Racing 351W bored and stroked to 427 hydraulic full roller
Posts: 54
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Not Ranked
Minimal damage to the fiberglass when the u-joint let go. So while it took some effort I got it all patched up and from the bottom side you can't tell it every occurred. Now I'm trying to work out the throw out bearing issues. I can get the clutch set so that it doesn't ride on the pressure plate or I can get it to shift right. Dang it... I think I'm going to go with a hydraulic throw out now since I have the motor out....
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11-09-2010, 12:27 AM
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CC Member
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Join Date: Oct 2006
Location: Virginia Beach,
va
Cobra Make, Engine: BDR #250
Posts: 234
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Not Ranked
Hitch,
I put in a Hydraulic Throw out Bearing a few years ago an haven't had any issues. I have a Quarter Master HTB. I did have to machine the input shaft bearing retainer to fit, not a big deal 10 minutes on a lathe... you didn't say, but did you have a drive shaft safety loop installed? I'm asking because I'm contemplating using a carbon fiber drive shaft so if it does break it won't cause to much damage. But if the safety loop stood up well then I won't...Mac
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