I have a v4 sti and i have a very strange vibration that starts when i pull away and up to 30 mph and then it stops if i pull away slowly you dont notice it its just noticeable under quick pull aways.

the car had cusco front and rear diff's which have now been replaced with standard sti diff's and a brand new center diff we have tried a new prop to see if it was that but the problem is still there when i launce the car hard it just spins all 4 wheels when i first did it i thought it was running RWD but smoke pores off all 4 wheels

any ideas to what the vibration could be its doing my head in running out of ideas

Cheers
ian

 

anyone ? lol

ian