Not So Good Vibrations (2 Viewers)

[davisdrafting]

Between 50 and 60 mph. in drive if I let off the accelerator then
apply throttle again there is a extreme vibration.
but if I press hard the transmission down shifts and stops vibrating
the same if I manually shift into 3rd.

To best describe the vibration I would compare it to driving
a manual transmission and shifting from 2nd to 5th at 25 mph.

Any ideas??

 

[MLX450]

Tires? Try to rotate them.

 

[yellowchaosfj80]

How is the idle .... is there a intake issues... or is this a driveing thing

 

[davisdrafting]

It’s defiantly a transmission issue, what… I don’t know.
I’ve adjusted the throttle to transmission cable to specks.

 

[Metal Spice]

Have you checked your U Joint? My truck vibrated unbelievably (mirrors & all) between 50 & 60 but when I took my foot off the accelerator it went away. The U joint was shot & once I got the new one in, no more vibration.