| ation transmission system can be difficult to diagnose | | | | itself works fine with the car of another idea, but when |
| because you can not get in the car and see what is | | | | combined can destroy a car where the transmission |
| happening while driving down the road at 60 MPH. If | | | | touches the body and shaft angles are unacceptable. |
| you've read my first article on the three types of | | | | Of course, this is not always the case, but if you run |
| vibration of propulsion, has a pretty good way to | | | | into a problem of vibration in a heavily modified car, |
| shorten the list of possibilities depending on whether | | | | you need to consider this possibility. |
| the vibration is engine speed related, related to vehicle | | | | If this is a recent restoration that was free of |
| speed, or in connection with engine load. Here are | | | | vibrations, then the first glimpse of all that has changed |
| some other considerations to take into account in the | | | | and the relationship of all components have with other |
| diagnosis of a classic car vibration. | | | | systems in the car. If you only changed a Ford 9 "on |
| The first thing to consider is the current situation in | | | | the back of his Chevy, the rear can be fine, but might |
| general. If it is a new construction that has never been | | | | have altered the driveshaft angles. An acceptable |
| run before, then everything is suspect. You can have | | | | angle just before might be a bit beyond the current limit |
| total faith in the engine builder, but could one of his tools | | | | setting vibration. |
| out of calibration? The engine is supposed to be | | | | Sometimes you have to "think outside the box." Once |
| balanced on the outside, and he ordered the wheel | | | | corrected a "vibration" in two years, 25,000 miles Buick |
| well, but actually received one for an internally | | | | LeSabre that had a complaint of vibration from the |
| balanced engine? Are your motor shaft angles out of | | | | first day. Has been to three different dealerships, |
| spec? Could you have faulty pinion bearings and axle, | | | | where they had rebalanced and replaced the wheels |
| an inclined axis, deformed wheel or a tire out of | | | | and tires on several occasions, had several alignments |
| balance? Is your exhaust to touch the body or some | | | | of wheels, and even had the shocks and struts |
| other component at any time? Are all the screws on | | | | replaced. I realized in a unit of the vibration test was |
| the suspension, body to frame bolts, nuts, and address | | | | only on the wheel. I could sit in the seats, armrests or |
| linkages / bolts tight? | | | | dashboard, or view mirrors. I took it to the store and |
| If this is a modified car, there are many more things to | | | | ran over some speed bumps at 10 MPH to see what |
| think about. If you have a 1968 Camaro (My Favorite | | | | happened, and the steering wheel moved about three |
| Year! ) With a total cost involved frontal, a late model | | | | inches up and down! I was a service writer at the time, |
| engine homemade LS3 engine mount towers, | | | | and all technicians refused to believe that the steering |
| transmission Keisler, a Currie 9 "rear and Detroit speed | | | | column may detach from the factory, so none of them |
| rear spring and download package, there a number of | | | | work on it. I searched the board and found that two of |
| different opportunities for inconsistency, not to mention | | | | the four screws holding the steering column to the |
| the fact that the car is nearly 40 years of age and the | | | | screenplay were about three laps shy of being even |
| tolerances of production at that time were much | | | | stronger finger! He had come that way from the |
| "looser" than they are now. Aftermarket companies | | | | factory, and none of the technicians had earlier taken |
| often design their pieces to fit a car completely stock, | | | | the time to pay attention to what was actually |
| and parts usually fit a car unmodified otherwise very | | | | happening with the car. Tighten the screws loose and I |
| good. When you start to combine spare parts from | | | | had a customer for life! Sometimes you have to open |
| different manufacturers sometimes have problems. | | | | your mind a bit, all assumptions and throw out the |
| The front of the aftermarket may be designed to | | | | window. |
| enhance the capacity of the curves changes a bit of | | | | The conclusion is to take your time and consider all |
| geometry that the transmission system aftermarket | | | | possibilities. To assess the overall situation, driving the |
| also changes due to interference with the transmission | | | | car, and think about what is happening. Do not make |
| tunnel, and then the back of The company also has a | | | | any assumptions, and realize that aftermarket parts |
| few liberties with his design for the rear end | | | | from different reputable companies are not always |
| adjustment of several different vehicles, and the | | | | designed to work with each other. Have an open mind, |
| company modified the rear suspension geometry for | | | | and with patience any vibration problem can be |
| maximum traction in endurance racing. Each part by | | | | diagnosed and corrected. |