I have only one. Haven’t had the driveshaft fail yet, so don’t know if two might be better. I tend to replace U joints and yokes enough, maybe that’s why I haven’t had a failure.


Mark

 

I have only one. Haven’t had the driveshaft fail yet, so don’t know if two might be better. I tend to replace U joints and yokes enough, maybe that’s why I haven’t had a failure.


Mark

Thanks Mark!

Never heard of such a thing. Man, that’s a great looking car though.

Isn’t it!? And it sounds even better than it looks

Maybe with two loops it would help contain the driveshaft to keep from sliding out onto the track where other cars could possibly run over it? I’ve only ever used one so not sure why else you would need two.

I’m sure that containment is the idea behind the second loop, and that would only be in the event of a rear u-joint failure, but I’m not sure how much of a difference it would really make; there’s probably oil and shrapnel on the track either way.

Im not sure of rules with those sanctions but if you look in real fast drag cars a lot of them have tunnels the shaft goes through. Reason is if the shaft were to twist in the middle the back of the shaft could still fall down and catapult the car. Having one in the back would prevent this no matter where the breakage occurs

I know that middle driveshaft failure is a thing in drag racing, but I don’t see that being an issue in road racing, especially with the way that parts are continuously scrutinized. Twisting a driveshaft in half takes an extreme shock load, and very sticky tires. I think the rear hoop is more intended to contain the shaft in the event of a rear yoke or u-joint failure.

 

Never heard of such a thing. Man, that’s a great looking car though.

 

Maybe with two loops it would help contain the driveshaft to keep from sliding out onto the track where other cars could possibly run over it? I’ve only ever used one so not sure why else you would need two.

 

Im not sure of rules with those sanctions but if you look in real fast drag cars a lot of them have tunnels the shaft goes through. Reason is if the shaft were to twist in the middle the back of the shaft could still fall down and catapult the car. Having one in the back would prevent this no matter where the breakage occurs

 

My understanding is: 1) Front loop is mandatory for most racing because it keeps the car from pole vaulting should the front joint break. This is placed with 6 inches of the joint. 2) Shelby Mustang had a loop attached at the bottom of the rear seat belt bolts. You can find this online to purchase and is a direct bolt in to my understanding.

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No

My understanding is: 1) Front loop is mandatory for most racing because it keeps the car from pole vaulting should the front joint break. This is placed with 6 inches of the joint. 2) Shelby Mustang had a loop attached at the bottom of the rear seat belt bolts. You can find this online to purchase and is a direct bolt in to my understanding.

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Correct. I was just curious if there was any real reason to drill more holes in the car, for a rear hoop. The thought of running two had never occurred to me prior to looking at photos of the Shelby I posted above. Obviously, it couldn’t hurt, but, based on the folks who responded, I’m just not seeing the need.

PS-the Shelby hoop won’t satisfy any sanctioning bodies, because it’s not a 360° hoop. And a company called Metco makes a really nice DOM hoop specifically for vintage Mustangs, but according to them the tunnel on 68-73 cars is a different shape, so their hoop will only fit 65-67.

 

The Metco hoop is nice and super beefy. Nothing a little heat and a bench vise wont cure.

 

I got this one from Tinman fabrications, it welds into the sub frame connectors.

 

Does anyone have some pics of the Metco loop installed in a car? I have one. I called them and asked for instructions, and got nothing useful.

Holding it under the car, I didn't find anyplace that felt right either.

 

If I get time tomorrow I will jack up my car and grab a pic. I have to finished installing my transponder before I load it on the trailer. Not making any promises, but I will try...

 

Sorry I just got around to this…

 

I run both front and rear. I have only broke a rear joint and it beat the hell out of the floor. Rear loop added after that.

 

@patrickstapler what is the diameter and length of the hoop. I have some larger pieces of pipe and think it would work to make one if it's big enough.

 

I'll measure it this weekend.

 

@patrickstapler Can you also measure how far back from the back of the cross member you have the front of the loop?

 

Yes