Ball Joint talk

What I wanted to discuss is regarding the screw in MOPAR style ball joint that is very popular with the tubular control arms for the venerable Mustang II suspension.

These two ball joints are very different in how they are supposed to be used

The ball joint pictured at the right is the commonly used K772 MOPAR screw in ball joint used on tubular control arms throughout the industry. If you look up that number you will see it is meant for MOPAR Upper Mid-Sized cars. It is not intended for use as a lower ball joint where it will see tension loads.

The ball joint on the Left is a K719. It has the same threaded body of the K772 but if you notice one very different difference in that body, it encloses much more of the ball stud. This is a true lower ball joint meant for the Mid-Size and larger passenger cars. While it will directly replace your K772 ball joint in the control arm, the stem is larger. This larger stem requires you to machine your spindle to accept it.

While many thousands of cars and trucks are on the road using the K772 as a lower ball joint without failure, we have seen a few. Granted, this is a very robust ball joint, and if you are using a quality joint like the MOOG Problem Solver line, you may never experience a failure. We have, on the other-hand, solved some driveability issues associated with the Mustang II suspension, mainly the nervousness out on the highway but replacing the ball joints with a true lower ball joint. Now don’t take this as the end all-cure all solution to your Mustang II suspension, it’s just something we have experienced. Because the K772 is not meant to be loaded in tension, it can be “sticky” and not let your steering wheel return to center properly.

All of our Mustang II based control arms feature the K719 on the lower, and we machine the spindles to fit. If this seems like an upgrade you would like to make, give us a call and we can take care of you.

1953-64 Studebaker frame

We have been working on a complete replacement frame for the Studebaker coupe. We had built a complete frame for a customer a few years back where we integrated one of our Studebaker clips and an early C4 Corvette rear suspension. We also learned what does and doesn’t work to make a frame that fits the stock body without modification. Well, very few and simple modifications anyway. Those tiny foot-well boxes behind the front seat have got to go. What we are delivering is a frame with significant improvements in strength. And almost all the stock body mounts are located in stock locations and stock body rubbers are used. No need to alter your front fenders, stock components fit.

Straighter frame rails and more clearance for exhaust systems. We keep the entire frame profile slim for good ground clearance as well as give you room for future modifications. We made the rear kickup quite a bit different by utilizing more space under the stock floor. This gives  us better places to attach the triangulated four bars and still not have to modify the floor. This rear kick up is also slightly narrower so that if you decide to do a mini-tub on the rear you have frame clearance to run up to a 275 wide rear tire on a 9″ wheel.

Full Frame for 53-64 Studebaker coupes.

Full Frame for 53-64 Studebaker coupes.

Spies Stude build: Frame

Getting on with the full frame fabrication for Gary Spies 53 Studebaker C-Coupe.

1954 Stude Frame E

2014-06-19 16.52.22 2014-06-10 14.39.28 2014-06-19 16.51.00