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The first thing to consider is the overall current situation. If this is a new building that has never run before, then everything is suspect. You May have total faith in your engine builder, but one of his tools from the calibration? Is the engine should be balanced out, and you ordered the correct flywheel, but actually got an internally balanced engine? Are your shaft angle from the specifications? Could you possibly have a defective pen or axle load, axle bent, warped wheels or tires out of balance? Is your exhaust touching the body, or other components at any time? Are all screws suspension, body, frame bolts, wheel nuts and connections / bolts tight?
If this is a modified car, there are so many more things to think about it. If you have a 1968 Camaro (my favorite year) with the total cost involved front-end, late model LS3 engine with a homemade motor mount towers, Keisler transmission, Currie 9 "rear end, and Detroit Speed rear spring and shock package, there large number of different options for incompatibility, not to mention the fact that the car is almost 40 years and then production tolerances are much "softer" than they are now. equipment companies typically design their parts to odgovaraopotpuno stock car, and parts usually will fit otherwise unchanged car very well. When you start to combine aftermarket parts from different manufacturers, sometimes you run into problems. aftermarket front end can be designed to enhance the capacity curve, which changes the geometry of some of the equipment of the transmission system also changes with respect to interference with the transmission tunnel, and then the rear end of the company also has some freedom with their designs to the rear end fit a few different cars, and the company changed the rear suspension geometry for maximum traction when drag racing. Every part of itself to perfect an otherwise stock car, but when all combined you end up with a car in which the transfer body touches the car and back angles are unacceptable. this, of course, is not always the case, but if you encounter a problem on the vibrations of heavily modified cars you have to take this possibility into account.
If the recent renovation of the vibration before, then first look at what has changed and the relationship between those components with other systems on the car. If you just replaced the Ford 9 "rear end in my chevy, rear end itself may be OK, but you could have changed the back corners. Kut, which is barely acceptable before it might be a little beyond the limits now generates vibrations.
Sometimes you have to "think outside the box". Once I corrected "vibrations" in a two year old, 25,000 miles Buick Lesabre that the vibrations from the first day of the complaint. It was at three different dealerships, which are rebalanced and replaced the tires and wheels a few times, had more wheel alignment, and even had to replace shocks and struts. I noticed on the test drive that the vibration was only in the steering wheel. I could feel in the seat, armrests and dash, or see it in the mirror. I took it back to the store and ran over some speed bumps at about 10 mph to see what had happened, and the steering wheel is moved about three inches up and down! I was a service writer at the time, and all the technicians refused to believe that the steering column can be lost from the factory, so that none of them will work on it. I dug in the dash and found that two of the four screws that secure the steering column to dash around the three stations are shy to even finger tight! He came that way from the factory, and none of the previous technician took the time to pay attention to what is actually happening with the car. I tightened the screws loose, and I had a customer for life! Sometimes you have to open your mind a bit, and throw all assumptions out the window.
The bottom line is that your time and consider all options. Assess the overall situation, to drive a car, and think about what is happening. Do not make any assumptions, and realize that aftermarket parts from various reputable companies are not always designed to work with each other. Have an open mind, and with patience any vibration problems can be diagnosed and corrected.
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