Recently found the bolts that hold the transmission cross brace were loose. Replaced those and visually inspected a number of other attachment points. Should I be looking at the drivetrain like the clutch or flywheel or somewhere in the suspension and body?
I think you have checked the major points, but if the transmision hung loose long enough it could damage the U-joints and motor mounts. The easy way to check the u-joint is to put the truck on ramps and put it in gear, then get under the truck and attempt to turn the drive line. If the drive line move 1/4 turn or more the u-joints are damaged. The motor mounts can be checked when the motor is running. Standing over the motor while someone else revs the motor you can see the motor move from side to side, more than three inch movement could indicate loose or broken mount. The clutch may be the culprit but I would check these first.
I have a sneaky suspicion its the U joint more so than the motor mounts as I remember how much the engine jumped before I replaced the motor mounts before. This is somewhat of a different feeling.
My truck does the same thing and i found 6 of 8 bolts missing that mount the tranny to the engine aling with dry rotted tranny mount.
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Mine does the same. 4 or so missing tranny to motor bolts bad tranny mount and worn suspe sion parts.
You will see a 17mm or 19 mm on the side with a 1/4 square you will need to loosen the 17 mm nut and turn the 1/4 square in, 1/4 amount only at a time
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