Should I have any concern of installing TCP's strut rods on my 1970 Mustang and the ride being to jarring? I have heard not to use urethane bushings on the stock strut rods and to use rubber. Any truth to this? If so, why and will the TCP's be rough as well?
The term "too jarring" makes your question hard to answer. Add to that the fact that I've never driven a TCP suspension kit (R&P only) and I wont even try. But I will say this...
The TCP design is for track or serious street, that makes me think that the ride will be on the harsh side to begin with. But if you are already running high-pressure gas shocks and stiff springs I don't think you'd see a huge increase in overall stiffness.
If you are afraid to run poly up there then you are justified to be wondering about these units. According to TCP they have linear deflection unlike rubber or even poly, but there's no mention of just what sort of resistance they have to deflection.
Even if you run nearly solid on the strut-rods all it will do is limit fore/aft movement of the LCA, plus add something to the springrate.
I believe they move more freely compared to rubber or poly bushed stock ones. up and down movement is what you want, not front to back movement.
I installed them on a 68 and love 'em.
I have a global west Stage 5 suspension on my car. The ride is very jarring. You hit a little bump in the street and the car shudders as it transmits the shock throughout the frame. But I can whip through a curve near my house at 70 mph and feel completely in control where my wife's Audi S4 could only do it at 60 mph before you felt you were about to fly off the road. Give and take.
i like the new design TCP strut rods a lot more than the older design with the heim joint. can't really say why for sure other than it looks to be a better engineered part and of course it puts the pivot point back where it should be.