hey everyone.
question....a few weeks ago i was driving my truck and when i put it into 4th and 5th gear, my truck starts to rattle and rumble. scared the ˟˟˟˟ outta me! i pulled over to check underneath and i didnt see anything outta the ordinary.
Ive searched the forums with similar problems but idk....it only happens
55-60mph 4th & 5th gear when i step on the gas pedal.

comments, suggestions & ideas to whats going on is much appreciated.
THANKS!!


1989 Toyota Pickup 4x4 Single Cab. 5speed manual

 

Too high of a gear with too low of rpms?

 

yeah i know that sound but this is way louder.
it feels like the cab is shaking and i feel it under the seat.

 

Motor or transmission mount somewhere?

 

Frame rot and bed hitting cab now.

 

So it happens at that speed under engine load only.

I'd buzz through your driveline. Check the output of the Xcase, U joints and pinion play. Also check your rear axle U bolts, leaf perch (cracked weld).

To me it sounds like driveline vibration.

 

Hey guy! I see this is an old post but it is the closest thing I could find to my problem. My truck (97 4runner 4cyl manual base) was running fine all morning this past weekend until I was driving down the highway with a friend. Midway through our trip, the truck started to vibrate. I figured maybe a tire weight flew off but when I dropped her off I saw nothing missing. I got back on the highway, threw it in 5th and realized it was only happening in that gear. Concerned, I got off the highway, stopped at a red light, and when I got back up to speed it started shuttering in 4th. A mile or so down the road it started in 3rd. Engine has all of it's power but shutters as if running at low RPMs when in these 3 gears and accelerating/maintaining speed. I can't for the life of me figure it out.