Thread: Four Link

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I'm looking for help finding dimensions to build my own rear frme section to tub my 94 sierra GT pick/up. I work in a steel fab shop so materials are not a question. Just the dimensions. Any help would be greatly appreciated, Thanks in advance, Rob

I'm building a 70 Z-28 Pro Street w/4 Link. What measurments do you need?

Originally posted by pro70z28
I'm building a 70 Z-28 Pro Street w/4 Link. What measurments do you need?

Don't know if this attachment will help?


Jerry Bickle's "Complete Guide To Chassis Performance" has some good info. Go to www.jerrybickel.com.
If measurements off my chassis will help, let me know.

Rob,
To get this project kicked off you need to know what size tire you want to run. If you are going to run a 21.50x33 then you need to design around that tire/ wheel combo. Here is a basic run down of the process I use.
1) Measure the width of your truck at the top of the fenderwells at the inside of the flange. This gives you the total width you have to work with.
1B) One thing I usually do is roll the rear flange up so I can move the tires a little farther outboard. I like the sidewall to be fairly flush with the outer sheetmetal and doing this allows you to move the tire out another 3/4's of an inch or so.
2) Measure the width of the tire, inflated, mounted on the rim width you plan to use. This is important and, unless you have access to a set already mounted, you need to have them on hand...
3) Subtract 6 inches from the total width for tire clearance (3 inches per side). I usually give the sidewall around 1 3/4's to 2" of clearance to the frame and 1" or so to the top of the wheel well after rolling the flange.
4) Subtract the tire width x 2 from the width left over after you do #3.
This will leave you with the new width for your rear frame.

5) You will have to have your tires and wheels before you can order the rear end housing. I actually never start a project like this without the tires and wheels.
You didn't mention a choice for your rear suspension but that will be a major factor and you will want to have all of those components on hand so you can design around them also.
A couple of things you can do is look at these sites. They have some informative tutorials and how-to's and will give you a good idea of what you're getting into.
http://www.cachassisworks.com/
http://www.artmorrison.com/

Mark

Hey guys, sorry I didn't check back earlier. Thanks for the great info. The links are really what I was looking for. Many years ago I made a living doing this kind of stuff at a speed shop. These days juggling 3 kids doesn't leave alot of spare time. At present my truck is lowered 6-5" and just needs the tub look to make it complete. Keeping in mind that I drive 60km a day in the summer months is OK, but I still have to deal with the wife beefin' about the money. This is why I would prefer to fab the main pieces myself in our metal shop. Also I can see why the tires are so important to determine the rest. Again, many thanks, Regards Rob