Subaru 4wd system.
Ok. When I hit c70mph over 3,000revs the front of the car suddenly starts to vibrate severly. Its getting worse, if I backed off it would stop however yesterday the vibration followed my speed down to 40mph. When I came to stop and started off again the vibration had disappeared.
Now I’ve redlined the car to see if it’s the revs in 2nd/3rd – the car pulls fine and no vibration at 6,000revs. The severe vibration only appears when Im on the motorway at 70/3k+.
-It cant be the suspension as the car would pull when I let go of the wheel (even on the motorway the car doesn’t pull/stays dead-straight). I have also visually inspected the suspension boots etc for leaks/splits.
-It cant be the wheel balancing as the vibration was still there when I reduced the speed on the motorway and I cant drive through the vibration?
-All tyres are inflated/no imperfections in sideways
-There are no leaks from the engine etc
-The car doesn’t overheat/rise above its normal temp, engine revs don’t rise/erratic etc, checked oil and coolant levels- fine.
(I could be wrong on the above- including balancing?). A Kwik Fit told me you can drive through the vibration if it is balancing?!
Could it be a dodgy engine mounting?- but this would vibrate the car at any speed inc when I redlined the car?
Loose Driveshaft? (as above?)
Something else lose in the engine bay (gearbox etc)- had a new clutch fitted a month ago.
I just want to eliminate/trouble-shoot as much as poss before I have to drop the car off at the indie to investigate. Not flush at the moment.