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Re: Chassis Guys, a little help please?
[Re: Brad4406]
#1572336
02/04/14 06:01 PM
02/04/14 06:01 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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There is a couple of ways to find center line.. one is to level the car and drop a plum bob from the front K-member mounting holes(there are reference holes in the frame rails also).. in the rear you might have to use reference holes now since you most likely dont have the front spring hangers anymore... once you drop the points to the floor you can measure to the center.. make sure you get a X measurement to see if its not parallelogram'ed (one side forward of the other)... once you see if its squared mark the frame/body for a zero on both sides(those marks will be there for good) and you can use them to align the diff 
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Re: Chassis Guys, a little help please?
[Re: MR_P_BODY]
#1572337
02/04/14 06:11 PM
02/04/14 06:11 PM
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Joined: Aug 2007
Posts: 2,224
Arlington, Tx.
BJS racing
top fuel
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top fuel
Joined: Aug 2007
Posts: 2,224
Arlington, Tx.
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Something like this.
Last edited by BJS racing; 02/04/14 06:12 PM.
Back in the swing of things at Painless again! Great to be back!
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Re: Chassis Guys, a little help please?
[Re: BJS racing]
#1572339
02/04/14 06:22 PM
02/04/14 06:22 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Something like this.
If I'm working on a old body(other than my own... nevermind that)
I will get frame points and centerline points of each
wheel (spindle on the fronts and centerline of the axle
at the wheel mounting points) so I can see if the suspension
points are in the same relationship to the frame points
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Re: Chassis Guys, a little help please?
[Re: Brad4406]
#1572341
02/05/14 02:22 AM
02/05/14 02:22 AM
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Joined: Mar 2013
Posts: 197
Nor-Cal
loaderpro
member
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member
Joined: Mar 2013
Posts: 197
Nor-Cal
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Quote:
Obviously I should have done more research before attempting a ladder bar/coil-over suspension.
How do I determine centerline of the vehicle? Once it's determined, how do I find center on the rear axle and how do I ensure the axle is centered in the vehicle? I know I can't use the pinion as it is offset to the passenger side. That's why I thought if I just hung plum bobs off the rear frame rails and measured the distance to the axle flanges and made sure it was the same distance on each side that the rear would be centered. I already triangulated the ladder bar crossmember before welding, ensured the ladder bar brackets are evenly spaced on the ladder bar crossmember, and ensured both ladder bars are adjusted the same.
Didn't mean to scare you...You can hang the rear in that way, then build the shocks and ladder bars around it. The string set up will help you find errors in any particular set up. It just takes time to set up. If you recheck all of your measurements and they are inside the 1/8 tolerance you are good to go. If not then I myself would lay it out on the floor and see whats amiss.
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Re: Chassis Guys, a little help please?
[Re: loaderpro]
#1572342
02/05/14 02:11 PM
02/05/14 02:11 PM
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Joined: Jul 2005
Posts: 70
Lebanon, OH
Brad4406
OP
member
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OP
member
Joined: Jul 2005
Posts: 70
Lebanon, OH
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Quote:
Quote:
Obviously I should have done more research before attempting a ladder bar/coil-over suspension.
How do I determine centerline of the vehicle? Once it's determined, how do I find center on the rear axle and how do I ensure the axle is centered in the vehicle? I know I can't use the pinion as it is offset to the passenger side. That's why I thought if I just hung plum bobs off the rear frame rails and measured the distance to the axle flanges and made sure it was the same distance on each side that the rear would be centered. I already triangulated the ladder bar crossmember before welding, ensured the ladder bar brackets are evenly spaced on the ladder bar crossmember, and ensured both ladder bars are adjusted the same.
Didn't mean to scare you...You can hang the rear in that way, then build the shocks and ladder bars around it. The string set up will help you find errors in any particular set up. It just takes time to set up. If you recheck all of your measurements and they are inside the 1/8 tolerance you are good to go. If not then I myself would lay it out on the floor and see whats amiss.
You didn't scare me, I was just thinking that maybe this was a little above my skill level. However, I changed my mind this morning.
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Re: Chassis Guys, a little help please?
[Re: Brad4406]
#1572343
02/05/14 02:12 PM
02/05/14 02:12 PM
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Joined: Jul 2005
Posts: 70
Lebanon, OH
Brad4406
OP
member
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OP
member
Joined: Jul 2005
Posts: 70
Lebanon, OH
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I had an epiphany this morning. For some reason, even though I used the tape marked garage floor for lining up all measurements previously, for some reason on the rear axle I was trying to use the vehicle rather than the floor. I don't know what I was thinking.
Thank you all for your inputs and guidance.
Last edited by Brad4406; 02/05/14 03:42 PM.
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Re: Chassis Guys, a little help please?
[Re: MR_P_BODY]
#1572346
02/05/14 05:56 PM
02/05/14 05:56 PM
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Joined: Jan 2004
Posts: 8,257
fredericksburg,va
cudaman1969
master
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master
Joined: Jan 2004
Posts: 8,257
fredericksburg,va
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its easy to set the axle center line square to the main center line by using the 4 6 10 formula. like a framing square on the floor, the main line 6 feet, axle line 4 feet, end of the 4 foot mark back to the 6 foot mark is 10 feet, a triangle, when the measurements are on there marks its square. wish i could show a drawing to make clear. its amazing how easy the build goes with those lines and plum bob.
total brain fade here, the # are 6-8-10 not 4-6, getting old is !!!!!
Last edited by cudaman1969; 02/06/14 01:22 AM.
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Re: Chassis Guys, a little help please?
[Re: cudaman1969]
#1572347
02/05/14 11:08 PM
02/05/14 11:08 PM
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Joined: Feb 2012
Posts: 32
Detroit, Michigan
sbsatellite
member
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member
Joined: Feb 2012
Posts: 32
Detroit, Michigan
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Quote:
its easy to set the axle center line square to the main center line by using the 4 6 10 formula. like a framing square on the floor, the main line 6 feet, axle line 4 feet, end of the 4 foot mark back to the 6 foot mark is 10 feet, a triangle, when the measurements are on there marks its square. wish i could show a drawing to make clear. its amazing how easy the build goes with those lines and plum bob.
I wish you could show a picture too...
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Re: Chassis Guys, a little help please?
[Re: sbsatellite]
#1572349
02/06/14 01:43 AM
02/06/14 01:43 AM
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Joined: Jan 2004
Posts: 8,257
fredericksburg,va
cudaman1969
master
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master
Joined: Jan 2004
Posts: 8,257
fredericksburg,va
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Quote:
Quote:
its easy to set the axle center line square to the main center line by using the 4 6 10 formula. like a framing square on the floor, the main line 6 feet, axle line 4 feet, end of the 4 foot mark back to the 6 foot mark is 10 feet, a triangle, when the measurements are on there marks its square. wish i could show a drawing to make clear. its amazing how easy the build goes with those lines and plum bob.
I wish you could show a picture too...
The numbers are 6-8-10 not thinking right, diagram i made
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Re: Chassis Guys, a little help please?
[Re: cudaman1969]
#1572350
02/09/14 01:01 PM
02/09/14 01:01 PM
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Joined: Jul 2005
Posts: 70
Lebanon, OH
Brad4406
OP
member
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OP
member
Joined: Jul 2005
Posts: 70
Lebanon, OH
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Well, after I replum bobbed, remarked the floor, and used the floor markings for all measurements this time, it turned out perfect; both sides are equal distance from the frame rails and both shocks are straight up and down. Everything is tacked and ready for final welds, which I'm about to do now.
Once again, thank you all for your help, guidance, and words of encouragement so I could get this done. I'll try to snap some pictures later today and post them.
Brad
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