I have a 53 Plate Renault Megane on 83,000 Miles, i recently was on a long run from Leeds - Nottingham in adverse weather conditions when the car started to shake very badly.
I pulled over on the hard shoulder as i thought i had a puncture, all wheels and tyres were as they should be when i started to accelerate the shuddering started between 40 - 70 Mph.
I have since had all 4 tyres replacedc and weights corrected on them and replaced 2 lover arms (Wishbones) and still i am getting the same problem???

Any ideas as i have spent quite a lot of money and the problem has not been rectified.

IainC, February 2013

the bad weather may be a clue to your problem,I am not sure on Renaults but on some models they have a very stiff c.v boot and have seen the small clip on the driveshaft work loose allowing water and dirt to enter the joint and wearing out joints rapidly,and some so bad causing a very bad vibration.I would have a look at your c.v boots and see if there is any excess play,also try driving with veh on full lock and listen for knocking from either side.It sounds as if you have had your suspension/steering/wheels/tyres checked out so it may be worth a look,good luck.

cdc, February 2013