Fresh start...

[DOUGIEB59]

ok gurus... Here we go, i,ve a rat, 3/4 ton chev rearend, and frame rails. The plan is to do a ladder bar setup w/ coil overs.
Any suggestions as to how to best set it up for "square" and to set up for tuning...
Am hoping to get the front wheels off the ground.
Thanks d/b

 

[DOUGIEB59]

SOMBODY HELP THIS GUY OUT BEFORE HE WELDS HIS ASS TO THE CONCRETE...

 

[Got Rust?]

Not sure what your asking, or try'n to do.
you plan on mounting thru the frame?
that frame?
or underneath with more support?
I see the engine is behind the rear axle, that should help get'n wheels off ground
without more info I'd go with under frame in line (so all fur wheels is go'n the same direction) and a stronger frame, judging from that picture, looks like it would twist.
lots of boys and girls here have played with rearends.
provide more info on what ya want, if ya can.
maybe I just need more coffee

 

[deerchooper]

is your frame square? is your front axle welded in?

if so, find a spot or 6, to measure from and square up your rearend.

 

[Willowbilly3]

I have several old travel trailer jacks, the screw kind. I level everything all directions and then measure corner to corner both ways to check for square. Of course both frame rails need to be the same length to pull square.
Then I also pull square from corner to corner on the axles.

 

[Torch]

Use more wood!​

Just kidding...
use a tape measure....
A squared plus B squared equals C squared
sometimes called the 3-4-5 rule
What is square? A right triangle.
A right triangle has an angle of 90 degrees

To show it easy to you we are going to just draw on the floor
go to your corner where you want your 90 degree angle to be. It helps to start with one straight line representing one frame rail or the frame centerline...
snap a chalk line on the floor from your corner to the end of the room.
measure 4ft foreward and make a mark.
Have someone hold your tape measure on your starting point and draw an arc through what should be an imaginary line 90 degrees to the chalk line you snapped.
Have them Hold your tape measure on the 4 foot mark and draw an arc at 5 feet through the arc you drew at 3 feet.
Snap a chalk line from your corner through the intersecting arcs and you are square

If you want to square up a larger area take any number and times it by 3, 4, and 5, to come up with the 3 sides of a larger right triangle.
This method is accurate to the width of your chalk line or pencil marks

 

[DOUGIEB59]

Got it centered, measured from corner to corner.

The plan is to utilize a prefab ladder bar crossbar w multi hole mounting bracket in the front, mount the adjustable ladder bars to that and make the fine tune adj for length and pinion angle.

Then, notch the frame for suspension travel and add the coil over set up,

anything i should think of before i start to tac weld?
Thnx d/b

 

[DOUGIEB59]

frt axle set w a lateral ft spring, and a split wishbone w speedwaw adj rod ends.

 

[deerchooper]

so you could measure from spring perch bolt to axle, to get square. do front to back both sides, then do it in an x shape both sides.

you need to have 2 nonmovable points on your rear axle to measure to.

once you got it squared, tac weld it to the frame and add you ladder bars. make sure your ladder bar ends are even with each other.

 

[Willowbilly3]

Use more wood!​

Just kidding...
use a tape measure....
A squared plus B squared equals C squared
sometimes called the 3-4-5 rule
What is square? A right triangle.
A right triangle has an angle of 90 degrees

To show it easy to you we are going to just draw on the floor
go to your corner where you want your 90 degree angle to be. It helps to start with one straight line representing one frame rail or the frame centerline...
snap a chalk line on the floor from your corner to the end of the room.
measure 4ft foreward and make a mark.
Have someone hold your tape measure on your starting point and draw an arc through what should be an imaginary line 90 degrees to the chalk line you snapped.
Have them Hold your tape measure on the 4 foot mark and draw an arc at 5 feet through the arc you drew at 3 feet.
Snap a chalk line from your corner through the intersecting arcs and you are square

If you want to square up a larger area take any number and times it by 3, 4, and 5, to come up with the 3 sides of a larger right triangle.
This method is accurate to the width of your chalk line or pencil marks

View attachment 52515

I wouldn't use 3-4-5 on a car frame, He isn't forming up a concrete pour. Plus it wouldn't work on anything with a taper, like a model A axle.

 

[DOUGIEB59]

Hi fellas', just read the post on not starting ne post in order to build a thread... I guilty, sorry... Heres a few shots in order to bring ya up to speed... Thnx for the help and support
d/b

 

[Torch]

I wouldn't use 3-4-5 on a car frame, He isn't forming up a concrete pour. Plus it wouldn't work on anything with a taper, like a model A axle.

If I didn't know how to measure I wouldn't use math either...I'd use a stick and a square... or a sheet of plywood... How do you think they make a square square?
regardless the taper on a model A axle the axle centerlines are (or should be) perpendicular to the driveshaft centerline. If some part of the axle is tapered use a reference that is not like the axle centerline or the edge of an axle flange (considering both flanges are the same diameter)
You can lay out your frame on the floor and check it with plumb bobs or measure it directly.

If your really good at measuring and marking accurately and your pencil is really sharp (don't use a fat sharpie or paint pen here) you can be more accurate than lazer alignment equipment.
The lazer equipment is only as accurate as 2x the width of the lazer beam if you don't know what your doing... and only as accurate as the width of the beam if you do.