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Measurements for mounting drive shaft loop? A-body #2547023 09/07/18 01:19 AM 09/07/18 01:19 AM
Joined: Oct 2007 Posts: 2,808 Wisconsin wkroncke17 OP master
wkroncke17 OP master Joined: Oct 2007 Posts: 2,808 Wisconsin	All, I bought one of the driveshaft loops made by Metco Motorsports. Very nice, quality piece. So the car is on a rotisserie right now (72 Demon) and I’d like to drill the holes before the bottom is painted. What I would like to know is how far behind the tail shaft do I mount the loop? The measurement I need (since there’s no transmission in the car) is how far back from the back of the trans mount do I place it to drill the holes?? I’m going to be using 904 transmission if that makes a difference??? Thanks in advance!! Wally.

Re: Measurements for mounting drive shaft loop? A-body [Re: wkroncke17] #2547044 09/07/18 02:34 AM 09/07/18 02:34 AM
Joined: Jan 2003 Posts: 2,006 s. e. pa. C calrobb2000 top fuel
calrobb2000 top fuel C Joined: Jan 2003 Posts: 2,006 s. e. pa.	hi nhra wants it 6 in from c/l of u joint last time i recall ?

Re: Measurements for mounting drive shaft loop? A-body [Re: calrobb2000] #2547201 09/07/18 02:05 PM 09/07/18 02:05 PM
Joined: Dec 2003 Posts: 22,784 Bitopia J jcc If you can't dazzle em with diamonds..
jcc If you can't dazzle em with diamonds.. J Joined: Dec 2003 Posts: 22,784 Bitopia	FWIW,has anybody seen an inspector measure the NHRA specified dim other then by eye? Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.

Re: Measurements for mounting drive shaft loop? A-body [Re: wkroncke17] #2547257 09/07/18 04:27 PM 09/07/18 04:27 PM
Joined: Dec 2005 Posts: 11,773 Fulton County, PA C CMcAllister Mr. Helpful
CMcAllister Mr. Helpful C Joined: Dec 2005 Posts: 11,773 Fulton County, PA	NHRA wants it no more than 6" away from the joint. Never seen it measured, but I've seen what happens when one gets loose at speed. NHRA specs are a minimum. I build them to satisfy me. If the results don't match the theory, change the theory.

Re: Measurements for mounting drive shaft loop? A-body [Re: wkroncke17] #2547262 09/07/18 04:48 PM 09/07/18 04:48 PM
Joined: Jan 2008 Posts: 755 Rochester, PA (near Pittsburgh... 1 1974 474 Duster super stock
1974 474 Duster super stock 1 Joined: Jan 2008 Posts: 755 Rochester, PA (near Pittsburgh...	Never been inspected either. Just go from the center of the U-joint out approx. 6". Keep it as close to that as possible. Keeps the carnage of an expired U-joint in the car. Don't want to give that driveshaft to much room to bounce around.

Re: Measurements for mounting drive shaft loop? A-body [Re: wkroncke17] #2547418 09/07/18 11:21 PM 09/07/18 11:21 PM
Joined: May 2003 Posts: 13,202 aZLiViN J J_BODY I Live Here
J_BODY I Live Here J Joined: May 2003 Posts: 13,202 aZLiViN	My “universal” hoop fit my 2” chromoly shaft ok, but was a bit close to my 3.5” aluminum piece. I sectioned it and welded in 2 pieces to widen it. Hope I never have to test it

Re: Measurements for mounting drive shaft loop? A-body [Re: wkroncke17] #2547752 09/08/18 11:28 PM 09/08/18 11:28 PM
Joined: Oct 2007 Posts: 2,808 Wisconsin wkroncke17 OP master
wkroncke17 OP master Joined: Oct 2007 Posts: 2,808 Wisconsin	Gotcha. Thanks for the replies all. If anyone has one built to this spec on an A-body, is there a chance I could get a measurement from the back of the trans cross member to the loop? My Demon is still on a rotisserie and want to drill the holes before paint. Thank you in advance!

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