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Author Topic:   9 in Ford Back Brace
jsracingbbf
Gearhead

Posts: 2160
From: Batesville,MS. , U.S.A.
Registered: Mar 2002

posted 04-23-2003 09:43 PM     Click Here to See the Profile for jsracingbbf   Click Here to Email jsracingbbf     Edit/Delete Message   Reply w/Quote
Ibought one of these things for whatever reason, anyway one guy says you CANT weld it while it's on the car, another guy tells me you can that it will even help keep it all in line. Just weld it slow so as not to warp the housing. TO MY FEEBLE way of thinking the second guy is right? AND it has the added benifit of NOT having to pull axles and 3rd member. The first guy say you must disassemble the whole thing pull it out of the car and use a jig so it doesn't warp. GOOD GREIF! WALDO !! What say the M & M chassis experts? Clue me in cuz I don't know.

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Jerry
69 Mustang Pro ET Drag
70 Mustang retired former footbrake car
Jimmy: ( S-10 driver/friend ) Hey Jer how do you like my flames I painted on the old Bowtie?
Jerry: Nice but you didn't have to do that, if you ever get it going fast enough at the strip it'll catch fire.

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Moneymaker
Administrator

Posts: 21725
From: Lyons, IL, USA
Registered: May 99

posted 04-23-2003 11:52 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
Best to do it off of the car in a rear end jig Jerry.
It is a long solid tube that goes through the entire housing and helps keep it straight during the welding process.
Othewise the side ubes will ebd forward, even with the axles in the spool.

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Alex Denysenko
Co-Administrator and Moderator

NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00,'01,'02,&'03
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
The Barry of BarrysGrrl

Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com

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jsracingbbf
Gearhead

Posts: 2160
From: Batesville,MS. , U.S.A.
Registered: Mar 2002

posted 04-24-2003 01:53 AM     Click Here to See the Profile for jsracingbbf   Click Here to Email jsracingbbf     Edit/Delete Message   Reply w/Quote
I was afraid you'd say that!
LOL
thanks
JS

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Moneymaker
Administrator

Posts: 21725
From: Lyons, IL, USA
Registered: May 99

posted 04-24-2003 08:10 AM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by Moneymaker:
Best to do it off of the car in a rear end jig Jerry.
It is a long solid tube that goes through the entire housing and helps keep it straight during the welding process.
Othewise the side tubes will bend forward from the heat, even with the axles in the spool.


------------------
Alex Denysenko
Co-Administrator and Moderator

NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00,'01,'02,&'03
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
The Barry of BarrysGrrl

Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com

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Ryan Wilke
Gearhead

Posts: 1700
From: Stanton, Michigan 49707
Registered: Oct 2000

posted 04-24-2003 08:10 AM     Click Here to See the Profile for Ryan Wilke   Click Here to Email Ryan Wilke     Edit/Delete Message   Reply w/Quote
Jerry:
IMO, this is like asking "which cam is best for a street/strip car"....

The problem here is "how slow is slow"...?

I agree with your second opinion, that it can be done without warpage -IF- it's done slow and deliberate. 1" weld on this end, wait an hour, 1" weld on that end, wait an hour, working your way to the center criss-crossing along the way. I'd probably expect to finish the job over 2-3 DAYS,,,but I'd bet that it could be done without warping the housing if you were to take it slow enough.

Now if you want to complete the welding job in 2-3 hours, then I'd say you'd be better off taking the housing out and slip in the round stock jig.......remember, the jig should slip in easily & OUT easily. If it doesn't slip easily out, then the housing has been warped anyway.........in which case, you can try to bend it straight or junk it and start over with another case.

Just MY humble opinion,,,, Ryan

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Mario428
Journeyman

Posts: 67
From: Charlottetown, PEI, Canada
Registered: Nov 2001

posted 04-24-2003 01:16 PM     Click Here to See the Profile for Mario428   Click Here to Email Mario428     Edit/Delete Message   Reply w/Quote
I have narrowed a dozen or so rear ends over the last few years mostly 9 inchers. The housing will warp almost any time you weld on it. I just take this for granted and every time I weld stuff onto a housing I cut the housing ends off first, do my welding and then use my jig to put the housing ends back on. This way everything ends up lined up good and there is no axle bearing problems down the road. The current housing in my car I got carried away welding the back brace on. When I went to put the housing ends on they were off by the thickness of the housing, welded it up that way and have no bearing issues at all.

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jsracingbbf
Gearhead

Posts: 2160
From: Batesville,MS. , U.S.A.
Registered: Mar 2002

posted 04-24-2003 04:35 PM     Click Here to See the Profile for jsracingbbf   Click Here to Email jsracingbbf     Edit/Delete Message   Reply w/Quote
Thanks guys! Just to be safe, I'll take it out. I was going to do this after 20 to 30 passes anyway. I may put a wishbone style locator on at the same time.

JS

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