[Ron Sutton]

Originally Posted by XTRMEASURES

Not sure if it's been mentioned but what size heim joints are used on the 3-link?

The 3-link rod end sizes are 3/4" x 3/4" and 3/4" x 5/8". Mild steel economy 2-piece rod ends would probably be OK but I can't bring myself to use them. There are 3 versions of chromoly rod ends. I use them all for different applications:
#1. Black lower cost versions that are the same size & shape as economy mild steel rod ends. Great value & extra piece of mind for a small price. These run no liner & need to be cleaned & lubed often. Zero stiction.

#2. Wide body 3-piece precision rod ends are the most expensive. The 3rd piece is a precision race that is pressed into the body. These run no liner & need to be cleaned & lubed often. Zero stiction.

#3. Wide body 3-piece precision rod ends with a Nylafiber race liner. The Nylafiber race liner is injected into the body. These are self-lubricated & self wiping, so they keep a high degree of grit off the wear surface of the ball. They don't require cleaning & lubrication often. About 1 pound of stiction.

Here are the radial load ratings & costs for comparison:
3/4" x 3/4" Economy Mild Steel: 18,810# (Cost $12)
3/4" x 3/4" Economy Chromoly: 25,000# (Cost $17)
3/4" x 3/4" Wide Precision Chromoly: 28,081# (Cost $33)
3/4" x 3/4" Wide Nylafiber Liner Chromoly: 28,081# (Cost $26)

3/4" x 5/8" Economy Mild Steel: 19,350# (Cost $12)
3/4" x 5/8" Economy Chromoly: 27,000# (Cost $17)
3/4" x 5/8" Wide Precision Chromoly: 40,572# (Cost $33)
3/4" x 5/8" Wide Nylafiber Liner Chromoly: 40,572# (Cost $26)

For low budget applications, I use & recommend the black economy Chromoly rod ends. The price is so close to mild steel & the strength is a big increase.

Both wide body Chromoly rod ends have the same shape, dimensions, materials & load ratings as each other. The body is almost twice as wide as the economy rod ends. I use these in all my race cars, Track-Star & AutoX-Star suspension kits. If it is going to be for an all out professional race car team that has the manpower to fully clean & service the car after each event, I use the Wide Precision Chromoly rod ends with no liner for zero stiction. For regular racers ... and ProTouring cars ... I use the Wide Nylafiber Liner Chromoly rod ends. They self clean & lubricate, last the longest and only add about 1# of stiction.

Special Note:
The Watt's link Bellcrank & links in the previous photos were just for mock up. This Track-Star Watt's link uses the right rear lower shock mount for the lower right Watt's link mount to reduce weight out at the end of the housing (which affects grip). The lower right Watt's link will have a S-bend step in it. The Watt's link Bellcrank will be 7.5" instead of the 5" version in the mock up photos & use 1/2" rod ends, not 3/4". It will be black anodized, as will the sway bar arms.

The Watt's link rod ends used are:
1/2" x 1/2" Wide Nylafiber Liner Chromoly: 16,238# (Cost $16)