the car shudders and vibrates violently at around 1,500-1,800 RPM.
Under acceleration, costing, slowing down, stopping/braking??
How many miles are on the vehicle??
FWD or AWD??
Have you had any work done recently??
If AWD, have you replaced any tires recently??
Need to give us more info pleaseā¦
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Without more info I will leave you with thisā¦
L-SB-0032-19 Lexus Technical Service Bulletin (tsbsearch.com)
Is the Check Engine Light on?
With all that pertinent info missing I leave you with 
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