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8 3/4 back bracing #111026 08/27/08 09:20 AM 08/27/08 09:20 AM
Joined: May 2008 Posts: 46 Colorado H hemiluver OP member
hemiluver OP member H Joined: May 2008 Posts: 46 Colorado	Gents, Thanks to all who contibuted to the rearend strength poll.The verdict was kinda all over the place.50/50 some guys have alot of luck and others dont.I think I'll take mine apart and give it a check.My car has alot of power but its a street car and see's drag action 3 to 4 times a year,so I'll give the existing 8 3/4 a shot.Does anybody have pictures or a link on how to properly back brace and 8 3/4? Thanks again-Gary

Re: 8 3/4 back bracing [Re: hemiluver] #111027 08/27/08 04:12 PM 08/27/08 04:12 PM
Joined: Oct 2004 Posts: 16,479 Canada CrAzYMoPaRGuY I Live Here
CrAzYMoPaRGuY I Live Here Joined: Oct 2004 Posts: 16,479 Canada	Mine has load bolt provisions through the back brace. 4646409-rear004.jpg (57 downloads) CrAzYMoPaRGuY

Re: 8 3/4 back bracing [Re: hemiluver] #111028 08/27/08 06:55 PM 08/27/08 06:55 PM
Joined: Aug 2005 Posts: 1,074 Wichita Kansas CH3NO2 super stock
CH3NO2 super stock Joined: Aug 2005 Posts: 1,074 Wichita Kansas	here's mine 4646696-S4020827(Small).JPG (125 downloads) Engine by DeTar http://www.kansasbadman.com

Re: 8 3/4 back bracing [Re: CH3NO2] #111029 08/27/08 07:44 PM 08/27/08 07:44 PM
Joined: May 2003 Posts: 1,527 Michigan G GoDartGo pro stock
GoDartGo pro stock G Joined: May 2003 Posts: 1,527 Michigan	does anyone have the template to drill the holes for the caps in the back of the housing???

Re: 8 3/4 back bracing [Re: GoDartGo] #111030 08/27/08 10:51 PM 08/27/08 10:51 PM
Joined: Apr 2003 Posts: 959 Cincinnati,Ohio J jcastle1 super stock
jcastle1 super stock J Joined: Apr 2003 Posts: 959 Cincinnati,Ohio	What exactly is the "bolt-load" for?Sorry for the ignorance but I see it al the time but I don't understand. Is something getting drilled thru the rear end? Please explain in detail(dumb it down for me) I have been thinking about a backbrace myself for a 489 in a b-body with manual trans. Thanks if anyone can help-John

Re: 8 3/4 back bracing [Re: jcastle1] #111031 08/27/08 11:31 PM 08/27/08 11:31 PM
Joined: Dec 2003 Posts: 22,696 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: 22,696 Bitopia	Quote: What exactly is the "bolt-load" for?Sorry for the ignorance but I see it al the time but I don't understand. Is something getting drilled thru the rear end? Please explain in detail(dumb it down for me) I have been thinking about a backbrace myself for a 489 in a b-body with manual trans. Thanks if anyone can help-John I believe the main purpose is to preload the stock caps that are thought to be under strenght for the task, by transfering some of their flex and therefore their load to the axle housing thru the bolts that are loaded to the center of the rear of the caps. However I am not sure any of that is necessary when using the much stronger say MW steel billet caps and bolts/studs. This topic gets a lot more airtime in the race section 4647349-PC120054-Web-Rear.jpg (39 downloads) Last edited by jcc; 08/27/08 11:40 PM. Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.

Re: 8 3/4 back bracing [Re: jcc] #111032 08/27/08 11:52 PM 08/27/08 11:52 PM
Joined: Jan 2003 Posts: 75,070 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,070 U.S.S.A.	Quote: Quote: What exactly is the "bolt-load" for?Sorry for the ignorance but I see it al the time but I don't understand. Is something getting drilled thru the rear end? Please explain in detail(dumb it down for me) I have been thinking about a backbrace myself for a 489 in a b-body with manual trans. Thanks if anyone can help-John I believe the main purpose is to preload the stock caps that are thought to be under strenght for the task, by transfering some of their flex and therefore their load to the axle housing thru the bolts that are loaded to the center of the rear of the caps. However I am not sure any of that is necessary when using the much stronger say MW steel billet caps and bolts/studs. This topic gets a lot more airtime in the race section You need them even with the billet caps because I think more than one person has split a billet cap . This is another one of those threads where the OP is FISHING for the answer he WANTS to hear, but hey it's your money so do what YOU want , you do not need the blessing of anyone else on how you choose to spend YOUR cash , I know i don't go asking anyone else how I should spend my money once I have my mind set.

Re: 8 3/4 back bracing [Re: jcc] #111033 08/28/08 12:31 AM 08/28/08 12:31 AM
Joined: Apr 2003 Posts: 959 Cincinnati,Ohio J jcastle1 super stock
jcastle1 super stock J Joined: Apr 2003 Posts: 959 Cincinnati,Ohio	I understand the purpose(kind-of)what I don't understand is ,do you drill into the pumpkin housing? I know it's a stupid question,but I don't understand if you are just mounting a load bolt on the reinforcment or if it goes thru the actual housing.

Re: 8 3/4 back bracing [Re: jcastle1] #111034 08/28/08 01:32 AM 08/28/08 01:32 AM
Joined: Oct 2004 Posts: 16,479 Canada CrAzYMoPaRGuY I Live Here
CrAzYMoPaRGuY I Live Here Joined: Oct 2004 Posts: 16,479 Canada	The housing is drilled, the back brace is drilled, and a threaded tube is welded in, both inside to the housing and outside to the brace. CrAzYMoPaRGuY

Re: 8 3/4 back bracing [Re: CrAzYMoPaRGuY] #111035 08/28/08 10:15 AM 08/28/08 10:15 AM
Joined: May 2008 Posts: 46 Colorado H hemiluver OP member
hemiluver OP member H Joined: May 2008 Posts: 46 Colorado	Thanks for the photo's! Do you have to put the axle in a jig to weld it? I heard that welding will pull them out of alighnment if not jigged?-Gary

Re: 8 3/4 back bracing [Re: hemiluver] #111036 08/28/08 01:33 PM 08/28/08 01:33 PM
Joined: Oct 2004 Posts: 16,479 Canada CrAzYMoPaRGuY I Live Here
CrAzYMoPaRGuY I Live Here Joined: Oct 2004 Posts: 16,479 Canada	Welding the backbrace will for sure need to be done in a jig IMO. CrAzYMoPaRGuY

Re: 8 3/4 back bracing [Re: CrAzYMoPaRGuY] #111037 08/28/08 09:08 PM 08/28/08 09:08 PM
Joined: Jan 2003 Posts: 1,017 Ridley Park, Pa. 69MOPE super gas
69MOPE super gas Joined: Jan 2003 Posts: 1,017 Ridley Park, Pa.	I have installed many 8 3/4 back braces and they normally warp up to 3/16 inch even with the housing jigged end to end. I always have to cut off the ends and reweld them on using an alignment jig centering them off the centerline of the carrier saddles.

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