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Author Topic:   Best way to square the rearend
diggen
Member
posted October 08, 2003 11:09 PM
ok not sure if car is still perfect as far as measuring from chassis...so is going from the front ball joints the best??or maybe pulling a string from back tires to front the best any other ideas or how do you do it!! thanks


tilley88
Member
posted October 09, 2003 12:57 PM
Go off the back of the motorplate.


Chad
Member
posted October 09, 2003 04:35 PM
If you're not sure about the squareness of the chassis, the most reliable way is to drop plumb bobs from the lower ball joints and the rearend housing. Roll the car back and place a straight piece of metal (I use angle iron) across the two front marks and a piece across the rear marks. Measure between the two pieces of angle iron (I measure approx where the tires would be). Make sure you use a square so that you're measuring at 90 degrees from the angle iron. This will tell you if your rearend is square. There are lots of ways to mearsure, but this method will always work. Good luck.


155fan
Member
posted October 09, 2003 06:09 PM
Your ride height and/or tire heights could screw up that measurement.


diggen
Member
posted October 09, 2003 10:43 PM
Thanks for the replies ....Think I'll try them all !!!! Chad's way sounds good I have done the ball joint deal but not with the angle iron and square !!!


Chad
Member
posted October 10, 2003 10:31 AM
Just another suggestion to make your measuring a little easier. Victory Circle race cars had an article about 6-7 years ago in Circle Track showing what they called a zerko-bob. What they did was take a standard zerk fitting, knock out the check ball, and cut a notch in the threaded part so the string from the plumb bob could be threaded up through the center of the zerk fitting and the notch would allow the string to come out through the top and the zerk to be screwed into the balljoint with the string adjustable to lower plumb bob. You will also be able to replace the stock zerk with the zerko-bob to make your measurements, then replace with the regular zerk after measuring. This takes all the problems out of trying to hold the plumb bob string with your finger on zerk and hoping it falls straight down. This is very hard to explain, but it takes about 5 minutes to make and works great.


155fan
Member
posted October 10, 2003 05:53 PM
I sorta agree with ya on that deal. I've jig built several streeters using the crossmember hole as a reference. I suppose you could measure to your rearend if everything else is level. Measuring from the lower ball joint zerk is pretty accurate, tho. The motor plate deal like I mentioned above should be fairly accurate if the car has'nt been bent. Might try the string method, too.


duke
Member
posted October 11, 2003 03:27 AM
I don't think the ball joint method will work if you have a chassis builder who has altered the lower A-frame mounts or run a ford front end that you use the strut bar to get caster??? How do the late models square them? Is their any advantage to leading / trailing the right front? I think the best way is off a square point in the car (motor plate) or if the car is bent the string method off a front tire.


boas51
Member
posted October 11, 2003 09:36 AM
The way Boas51 is describing is in this months circle track with a diagram.


boas51
Member
posted October 12, 2003 10:29 AM
i would believe it, i learned it from a bob bolles publication.