Bad shuddering between 20-40mph

Hello all im new to the site but i figure this is the best place to get some help with my Tacoma . i noticed while under slow acceleration or just giving it enough gas to maintain a speed between 20 and 40 mph it will shake badly but as soon as I let off the gas or give it more gas it goes away . its not always the same kind of vibration ...sometimes a slow vibration when going around 20 mph compairable to driving on a washboard road and sometimes when going faster its a faster vibraton. Since the occurrence I’ve had the rear leaf springs replaced the whole driveline replaced carrier bearing also and the output shaft for the tranny I’m at a loss. ANY thoughts or information would be very helpfull !!! thanks

 

Google -> 2nd generation Tacoma shudder

 

check tranny fluid level, clean MAF and check torque converter bolts