Hi buddy, im in no way saying fitting poly bushes will magically repair a gear box with failed synchros. in our gt4 we caught the issue as it began, i.e on the 1/4 mile unable to shift into 4th from high revs in 3rd allowing the gears time to slow down allowed us to change gear, so we called it quites as we had already reached our target for that day.
when we got back to the workshop we checked and the car would crunch into 4th but only at high revs under drag acceleration and abuse, we then fitted our poly bushes to the linkages and this gave us the ability to regain our 4th gear selection under the same conditions.
There is a reason these cars were designed with rubber and brass bushes as standard. the gt4 is a rally bred car and they still come with them, granted in some cars rubber bushes are used to make every day driving very smooth and boring for the enthusiast, but in some cases rubber bushes are required to insure correct tollerences are kept, and simply put, making these parts have no give means it has to give elsewhere instead.
when i say time i dont mean 5 min for it to change gear we are talking milliseconds as the gears align correctly with the syncho, we tested on both cars with short shifters and standard shifters but the results were similar for both, it all depends on the car, how it has been modified, if at all, and with what quality of parts.
when we got back to the workshop we checked and the car would crunch into 4th but only at high revs under drag acceleration and abuse, we then fitted our poly bushes to the linkages and this gave us the ability to regain our 4th gear selection under the same conditions.
There is a reason these cars were designed with rubber and brass bushes as standard. the gt4 is a rally bred car and they still come with them, granted in some cars rubber bushes are used to make every day driving very smooth and boring for the enthusiast, but in some cases rubber bushes are required to insure correct tollerences are kept, and simply put, making these parts have no give means it has to give elsewhere instead.
when i say time i dont mean 5 min for it to change gear we are talking milliseconds as the gears align correctly with the syncho, we tested on both cars with short shifters and standard shifters but the results were similar for both, it all depends on the car, how it has been modified, if at all, and with what quality of parts.