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Re: Tips on making a rear end narrowing jig? [Re: markz528] #1701381 12/07/14 08:56 AM 12/07/14 08:56 AM
Joined: Mar 2012 Posts: 220 J Jerry Kathe enthusiast
Jerry Kathe enthusiast J Joined: Mar 2012 Posts: 220	If you welding skills are within reason of your machining skills, you will be fine. Good Job!

Re: Tips on making a rear end narrowing jig? [Re: Jerry Kathe] #1701382 12/07/14 11:21 AM 12/07/14 11:21 AM
Joined: Jun 2004 Posts: 2,360 Mobile Alabama S SB412DUSTER top fuel
SB412DUSTER top fuel S Joined: Jun 2004 Posts: 2,360 Mobile Alabama	I went to WalMart and bought a gun bluing kit and applied that to the pucks so they would not rust as easy.

Re: Tips on making a rear end narrowing jig? [Re: SB412DUSTER] #1701383 12/07/14 11:36 AM 12/07/14 11:36 AM
Joined: Sep 2003 Posts: 20,458 north of coder moparx "Butt Crack Bob"
moparx "Butt Crack Bob" Joined: Sep 2003 Posts: 20,458 north of coder	and if you need to straighten the housing after welding, measure with 3' sticks of straight, stiff material clamped to the ends at 90* intervals. if out, keep the inner pucks & bar clamped into the diff while the housing is chained to a hefty piece of I beam. a touch of heat[plus wet rag quench] & a small bottle jack [12tonish or so] will put the housing into the correct place so the end pucks will zoom into the bearing bores easily on the center bar. this process description sounds lots more difficult than it really is.

Re: Tips on making a rear end narrowing jig? [Re: moparx] #1701384 12/07/14 02:20 PM 12/07/14 02:20 PM
Joined: Apr 2005 Posts: 12,271 Overpriced Housing Central RobX4406 I Live Here
RobX4406 I Live Here Joined: Apr 2005 Posts: 12,271 Overpriced Housing Central	Nice work on the mandrels.

Re: Tips on making a rear end narrowing jig? [Re: RobX4406] #1701385 12/07/14 06:43 PM 12/07/14 06:43 PM
Joined: Dec 2005 Posts: 12,526 Fulton County, PA C CMcAllister Mr. Helpful
CMcAllister Mr. Helpful C Joined: Dec 2005 Posts: 12,526 Fulton County, PA	Rather than trying to fix it after it's welded or welding the ends on off center, I've been doing it a little differently. I fixture the housing and pull the ends of the tubes forward (away from the brace), fit the brace to the housing at that point and hold the bow while welding it. It's going to pull. May as well have it pull back to where it needs to be. I don't actually bend the housing and pull it so far that it springs back to where I want it, I just pull it to where I want it and hold it there. The 9" and 8.75" housings have some flex in them before they are braced up. Easier to do it before than after the brace is welded up. Keep the jig bar in the housing and use it to measure how far off from axle centerline you are moving it. The amount you pull it depends on the width of the housing and the brace. The longer the weld, the more it needs to be compensated for. Maybe 1/4 or so on a stock length housing, less as it gets narrow. Spend the time to get a tight fit on the brace. Relying on filler to take care of gaps will make the pull worse. If the results don't match the theory, change the theory.

Re: Tips on making a rear end narrowing jig? [Re: CMcAllister] #1701386 01/19/15 08:53 PM 01/19/15 08:53 PM
Joined: Jan 2003 Posts: 4,363 Morrow, OH markz528 OP master
markz528 OP master Joined: Jan 2003 Posts: 4,363 Morrow, OH	Well you all scared me about how much it is gonna move so I ended making a jig. Its as good as I can make it, so if it moves I will use the jig to straighten it. Back brace is pretty much ready to get welded. 67 Coronet 500 9.610 @ 139.20 mph 67 Coronet 500 (street car) 14.82 @ 94 mph 69 GTX (clone) - build in progress......

Re: Tips on making a rear end narrowing jig? [Re: markz528] #1701387 01/19/15 08:56 PM 01/19/15 08:56 PM
Joined: Jan 2003 Posts: 4,363 Morrow, OH markz528 OP master
markz528 OP master Joined: Jan 2003 Posts: 4,363 Morrow, OH	Having trouble with picture. Lets try this....... 8401890-bracejig.JPG (543 downloads) 67 Coronet 500 9.610 @ 139.20 mph 67 Coronet 500 (street car) 14.82 @ 94 mph 69 GTX (clone) - build in progress......

Re: Tips on making a rear end narrowing jig? [Re: markz528] #1701388 01/19/15 09:11 PM 01/19/15 09:11 PM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	Just weld short spots at a time and jump around.. do some on the left... jump to the right side and let it cool. if I can put my hand on it with my light gloves I'll burn there.. just jump around

Re: Tips on making a rear end narrowing jig? [Re: markz528] #1701389 01/19/15 09:33 PM 01/19/15 09:33 PM
Joined: Nov 2004 Posts: 6,890 North Alabama M Monte_Smith master
Monte_Smith master M Joined: Nov 2004 Posts: 6,890 North Alabama	Quote: Well you all scared me about how much it is gonna move so I ended making a jig. Its as good as I can make it, so if it moves I will use the jig to straighten it. Back brace is pretty much ready to get welded. Your back brace is too short. It WILL bend out on the ends with the brace that short. You obviously have fab skills. I suggest you run the brace as close to the ends as possible and then "tube" the brace for the U bolts Monte

Re: Tips on making a rear end narrowing jig? [Re: Monte_Smith] #1701390 01/19/15 09:43 PM 01/19/15 09:43 PM
Joined: Jan 2003 Posts: 4,363 Morrow, OH markz528 OP master
markz528 OP master Joined: Jan 2003 Posts: 4,363 Morrow, OH	Quote: Quote: Well you all scared me about how much it is gonna move so I ended making a jig. Its as good as I can make it, so if it moves I will use the jig to straighten it. Back brace is pretty much ready to get welded. Your back brace is too short. It WILL bend out on the ends with the brace that short. You obviously have fab skills. I suggest you run the brace as close to the ends as possible and then "tube" the brace for the U bolts Monte Monte - I was thinking of adding some end pieces that overlap the short brace by about 12 inches and bring it as you said, as close to the ends as possible. Do you think that would be effective? 67 Coronet 500 9.610 @ 139.20 mph 67 Coronet 500 (street car) 14.82 @ 94 mph 69 GTX (clone) - build in progress......

Re: Tips on making a rear end narrowing jig? [Re: markz528] #1701391 01/19/15 10:12 PM 01/19/15 10:12 PM
Joined: Nov 2004 Posts: 6,890 North Alabama M Monte_Smith master
Monte_Smith master M Joined: Nov 2004 Posts: 6,890 North Alabama	Quote: Quote: Quote: Well you all scared me about how much it is gonna move so I ended making a jig. Its as good as I can make it, so if it moves I will use the jig to straighten it. Back brace is pretty much ready to get welded. Your back brace is too short. It WILL bend out on the ends with the brace that short. You obviously have fab skills. I suggest you run the brace as close to the ends as possible and then "tube" the brace for the U bolts Monte Monte - I was thinking of adding some end pieces that overlap the short brace by about 12 inches and bring it as you said, as close to the ends as possible. Do you think that would be effective? Outside the perches is where it will bend...........needs something to support it Monte

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