Also, what is the stock diameter? I read on here they were threaded 11/16-18, but on MU, they say 5/8 thread diameter. Does anybody know for sure?? Thanks.

 

Which one? 65/66 or 67.
The 67 strut rod is 0.770"
Who is MU?
The thread on the 67 strut rod is 11/16-18
I think 5/8" is the 65/66 maybe?

I've modified a few 67 strut rods for use on 65/66 cars. Never done one with
a heim/rod end joint though. Something about that part being in single shear
doesn't appeal to me. All of the modded ones I did used high density rubber
bushings with a steel liner, like the Moog bushings.

ex-Global West GM
1991-1995

 

I used HRSMXL8T rod ends from FK. Note I used a left hand thread rod end. FK's catalog is down for some reason.

FK Rod Ends- Home Page


I recall reading a calculation that placed it around 2500 lbs. Tons of variables here like tire size, vehicle weight and braking capacity.However, you have to use a safety multiplier.

The load I can't accurately calculate is what if you were hard braking and hit a giant pothole. That is why I used the strongest end I could find that wasn't obnoxious. The cost difference is negligible in the big picture.

 

I am the anyone btw. Not the engineer.

 

The right rod end (high strength heat treated chrome moly) with 5/8" or 3/4" threaded shaft has plenty of strength for this application. Over 20,000 lbs axial strength so single shear would be no problem and several aftermarkets are like this. The 1/2" grade 8 bolt at the end has about the same proof load strength

As far as load, without shock, there is some negative G tension forces on the strut rods when you brake so 2500 lbs sounds light. Shock force can be several Gs. In any case, with 2 strut rods carrying the load in front and a 3000 lb car, and some of the weight being transferred by the diff housing and leaf springs as the rear brakes are also braking, 2500 lbs could be close for a non shock case, but shock load could be exceeding that.

 

I got the global west adjustable strut rods and they're about 11/16 I believe. Lets just say its bigger than the oem. Been riding in them the past month and so far nothing is wrong. Not too sure of the max load on them.

 

How would one mount a rod end in single shear in this application?

Keep in mind the other end has 2 bolts in single shear. So, you only have to be as strong as that.

 

Keep in mind the other end has 2 bolts in single shear. So, you only have to be as strong as that.

Good thinking. Do you know what size the 2 bolts are? I believe they are 3/8." Single shear is 9,900 on a grade 8 3/8" bolt. Multiply that by the 2 bolts, and it would give 19,800 lbs.

I'm looking at some alternatives to the OEM and heim joints.

 

Funny no one is talking about the other end. You know, two bolts, bolted to a piece of thin sheet metal.

 

??? Really? You may want to read it again.

Bob

 

I am guessing you have never seen a strut fail due to good threads giving way. I believe the load on the rod end is called tension.

 

I'm willing to bet a rod end would probably fail before two 11/16-18 nuts would
"peel threads". If you have seen that sort of failure it wasn't in merely driving
the vehicle, it would be catastrophic failure from a collision.

ex-Global West GM
1991-1995

 

Ochohill, I have looked through your thread several times. I really like your design, and it has been some inspiration in my plans. If I cannot make my alternative plans work well, I will be using your design but using my stock strut rods. I will cut, thread them, and use the cross bolt Idea to keep the pivot point in the stock location, or possible extend it forward more. Thanks for the ideas!

I love your wheels by the way. Your car looks great.