S2000 vibration when decelerating

Hi, you could check your engine mounts.

There are many stages of vibration. The most common is in the steering and USUALLY a steering dampner will correct this. However, your description is not real defined and until the technician actually experiences it, it cannot be properly diagnosed

No, It is a common known problem, You can buy a speedo calibration device from ricks2k

You didn't say whether your blazer is a 2wd, 4wd, or awd. It sounds like you have a bad wheel bearing. If it's an all wheel drive, it could be the CV joint. You should also check for loose lug nuts and low tire pressure.

I'd call dealer to see if parts are avail if not see if they have reman

speed sensitive issue could more likely be a loose heat shield on the exhaust system. this would change with speed and heat. check hangers and connecters on exhaust, I've come across a muffler clamp that set up quite a rattle as it vibrated around the ex. pipe. could be a bent dust shield on one of the disc brakes that is rubbing on the rotor but would likely change with steering direction. take off and check the belt pulleys and idlers for a loose bearing assembly.

Is there any "clunking" when going from f to reverse? drive train joints could be responsible, and they would be sensitive to power up or deceleration differences. usually more of a vibration and not a loud noise however.

THE ORIGINAL VIBRATION MAY HAVE BEEN TIRES.IF THE LUG NUTS WERE NOT TORQUED BY HAND BUT OVERTIGHTED W/AN AIR RATCHET THE ROTORS MAY HAVE BEEN WARPED.TAKE IT BACK TO WERE THE TIRES WERE INSTALLED AND ASK THEM TO CHECK IT OUT.

Check your drive shaft u-joints..Number one cause.Have a great night!!!

I’m happy to assist further over the phone at https://www.6ya.com/expert/joe_a3369546f8067589

Could be u-joints. My wife's Pathfinder developed a vibration at highway speeds. A little research revealed the front driveshaft u-joints bearings would begin to fail causing some play. Took it in to have them inspected and sure enough- the little needle bearings were grinding down to dust. Replaced with greesable units and vibration is gone.
Certainly worth checking out.

tranmission mount is broke change it before it breaks your motor mounts.