driveshaft loop install.. how far back - Chevelle Tech

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post #1 of 23 (permalink) Old Nov 5th, 08, 9:51 PM Thread Starter
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driveshaft loop install.. how far back

im going to the track this sunday, and now that i have sticky tires, i need to run a loop since i have a stick.

so how far back does the loop go from the x-member, is it 6"?

thanks

aaron

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post #2 of 23 (permalink) Old Nov 5th, 08, 10:08 PM
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Re: driveshaft loop install.. how far back

I think no farther than 6" back from the u joint.

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post #3 of 23 (permalink) Old Nov 5th, 08, 10:14 PM
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Re: driveshaft loop install.. how far back

Quote:
Originally Posted by 77 cruiser View Post
I think no farther than 6" back from the u joint.
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post #4 of 23 (permalink) Old Nov 6th, 08, 2:03 AM
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Re: driveshaft loop install.. how far back

Here's a pic of the loops that BMR Fabrication sells. But they come in black unless you specify red. I installed one of these on my 70 Chevelle, and what I like about them is that they're contoured specifically for our cars, since the arms are angled perfectly to follow the angle of the reinforcement boxed rib on the Chevelle floor board where the floor is the strongest. Which I believe is also the perfect distance away from the front U-joint. The main hoop also fits the driveshaft tunnel perfectly. It makes for a much more precise fit and a cleaner install than those universal type loops made by Lakewood and Competition Engineering do.

http://www.bmrfabrication.com/A-Body.htm


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post #5 of 23 (permalink) Old Nov 6th, 08, 9:01 AM
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Re: driveshaft loop install.. how far back

Quote:
Originally Posted by BillyGman View Post
Here's a pic of the loops that BMR Fabrication sells. But they come in black unless you specify red. I installed one of these on my 70 Chevelle, and what I like about them is that they're contoured specifically for our cars, since the arms are angled perfectly to follow the angle of the reinforcement boxed rib on the Chevelle floor board where the floor is the strongest. Which I believe is also the perfect distance away from the front U-joint. The main hoop also fits the driveshaft tunnel perfectly. It makes for a much more precise fit and a cleaner install than those universal type loops made by Lakewood and Competition Engineering do.

http://www.bmrfabrication.com/A-Body.htm

Thats just sick. Mine came in pieces. Ready to assemble..right.
Nice loop..

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post #6 of 23 (permalink) Old Nov 6th, 08, 10:00 AM
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Re: driveshaft loop install.. how far back

Quote:
Originally Posted by BillyGman View Post
Here's a pic of the loops that BMR Fabrication sells. But they come in black unless you specify red. I installed one of these on my 70 Chevelle, and what I like about them is that they're contoured specifically for our cars, since the arms are angled perfectly to follow the angle of the reinforcement boxed rib on the Chevelle floor board where the floor is the strongest. Which I believe is also the perfect distance away from the front U-joint. The main hoop also fits the driveshaft tunnel perfectly. It makes for a much more precise fit and a cleaner install than those universal type loops made by Lakewood and Competition Engineering do.

http://www.bmrfabrication.com/A-Body.htm

Thanks, Billy.

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post #7 of 23 (permalink) Old Nov 6th, 08, 10:03 AM Thread Starter
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Re: driveshaft loop install.. how far back

thanks guys.

i have a universal one i got from jegs about 2 years ago that i never put on. i will make it work.

thanks again.


aaron

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post #8 of 23 (permalink) Old Nov 6th, 08, 10:28 AM
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Re: driveshaft loop install.. how far back

I like the concept of the loop that bolts under the trans mount. Does anyone have or know of anyone's experience with it doing what it needs to do if a joint actually breaks? Thanks,

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post #9 of 23 (permalink) Old Nov 6th, 08, 1:53 PM
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Re: driveshaft loop install.. how far back

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Originally Posted by OLDED View Post
I like the concept of the loop that bolts under the trans mount. Does anyone have or know of anyone's experience with it doing what it needs to do if a joint actually breaks? Thanks,
I liked it too, so I bought one (although I cannot remember where I bought it from, and I've misplaced the receipt, so I couldn't even tell you where) but I went to put it on my car, and learned that it's only good for the Chevelle stock sized 1310 series U-joints. I have 1350 series U-joints, and that loop that bolts to the transmission mount has a diameter that's too small, so it won't even clear the 1350 U-joint, nor the 1350 series transmission slip yoke. It looks like it would be good if you have the smaller 1310 U-joints though.

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post #10 of 23 (permalink) Old Nov 6th, 08, 3:13 PM
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Re: driveshaft loop install.. how far back

Wish I would have seen this when I posted about a loop,(thats a nice unit) had a lakewood & fabbed ,bent to conture of the body brace ,loctite all bolts ,& renforced. yes 6" max from u/joint center 2"wide band is the NHRA rule in the 2007 book

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post #11 of 23 (permalink) Old Nov 6th, 08, 4:07 PM Thread Starter
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Re: driveshaft loop install.. how far back

thanks guys.

aaron

1971 Chevelle. 355, megasquirt efi. On3 7875 turbo. 4l80e, py3600, 355 gears. C5 brakes, SC&C stg2+, hellwig bars, 04-06 gto seats. 546rwhp/450rwtq with 28% converter slip on 18psi!

Little walk around video

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post #12 of 23 (permalink) Old Nov 6th, 08, 5:07 PM
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Re: driveshaft loop install.. how far back

I easily made one.I bought just the 2" loop from Jegs,I think it was around 10 bucks.I then took a piece of 1/2"bar stock about 3" wide by about a foot long.Welded the loop on the top of the end of the stock.There are 2 holes,one behind each other on the crossmember,a couple of inches apart,parallel with the tailshaft.One was 1/2 " drilled the other one out to 1/2".Drilled the stock and bolted it into place with two 1/2" hardened bolts.It's a bit of an overkill as strong as it is,and it's a little heavy,but the best part is I didn't have to drill any holes in my virgin floors,and it's easily unbolted out of the way.

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post #13 of 23 (permalink) Old Nov 6th, 08, 9:56 PM
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Re: driveshaft loop install.. how far back

Does any of this stuff have to be something like SFI approved?

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post #14 of 23 (permalink) Old Nov 7th, 08, 1:37 AM
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Re: driveshaft loop install.. how far back

Quote:
Originally Posted by big_red View Post
Does any of this stuff have to be something like SFI approved?
Not that I know of. My guess is that if the tech inspector can reach the loop, and he grabs onto it to try and wiggle it, and it feels solid, then he won't have a problem with it as long as it's relatively close to the front U-joint. And I can't see them trying to crawl under there with a tape measure to enforce the exact distance specified by the NHRA rule book either.

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post #15 of 23 (permalink) Old Nov 7th, 08, 2:06 AM
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Re: driveshaft loop install.. how far back

Quote:
Originally Posted by BillyGman View Post
Not that I know of. My guess is that if the tech inspector can reach the loop, and he grabs onto it to try and wiggle it, and it feels solid, then he won't have a problem with it as long as it's relatively close to the front U-joint. And I can't see them trying to crawl under there with a tape measure to enforce the exact distance specified by the NHRA rule book either.
Your guys tech inspector actually looks? Wow ours just says you got a loop? Yup, alright then your ready to go.

Its helps if you havent washed your car since las ttime and you still have the numbers on the window.
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