Turbo_Dreams

So my tranny recently started making a horrible noise and upon a lil digging around i noticed that a couple of the bolts connecting the flex plate to torque converter had completely backed out and the ones that were still there were all loose. So I replaced the missing bolts and tightened down the rest, but now there is a vibration thats feels like its coming from the trans. It gets worse at highway speeds. Could the it be that the flex plate and torque converter some how got out of balance? or is it something more serious??

DeathCougar

iTrader: (23)

Sounds to me like a cracked flexplate. Does the vibration happen even without the truck moving? If so, you can elminate any moving drivetrain parts such as drivelines, rear end, or axles. If the bolts backed out and allowed the flexplate to move or vibrate too much, it can crack at the crankshaft bolts.

Next time, make sure you use loc-tite on the torque converter bolts.

mt_goat

Did you notice one of those bolts is different than the others, both in color and shoulder size. That bolt is suppost to be threaded in first, kind of a centering thing. Don't know if that will help or not. Good luck

EDIT: Yeah Death that was a thought I had too.

Turbo_Dreams

its only when the truck is moving, or really only when accelerating. if im rolling down the road and let off the gas the vibration stops, and comes back as soon as i hit the gas again. Also at 55-60 if i let off the gas theres a "whirring" sound for lack of a better term. It sounds like a rotational decelerating sound and stops after a second of two

FredTJ

Almost certainly cracked the flex plate.
Very common.
Use to see it all the time.



Fred

Turbo_Dreams

so it turns out the flex plate isnt cracked but the bolt holes are all jacked up... i ordered a new flex plate and it should be here tomorrow. But i have another question what does a normal torque converter feel like, i dont have any auto experience, so im not really sure what is normal

abecedarian

which bolt holes? the ones on the flex plate? well... if you're getting a new flex plate, it should be balanced fine so no vibes from it.
a normal torque converter should feel like your's did before it started making noise and vibrating. just step on the skinny pedal and go.

the only thing I might be concerned with is the pilot opening on the end of the crank. if the torque converter was loose and wobbling long enough, it could cause the pilot hole to become 'out of round' thus not centering the torque converter properly.

Turbo_Dreams

the new torque converter is on the way, the one i got from napa was the wrong one... so i guess ill spend the big bucks from the yota dealership. The converter was loose feeling while out of the trans, ie when i wiggled it it had some play. im pretty sure it is in spec. the bolt holes on the fp were distorted and it was obvious that it had been rattling. my trans fluid smelled fine and the tc seems in good shape, but again im not really sure when it comes to these

buckz6319

Turbo_Dreams......I would like to know if your problem is solved?....

I would like to know because I feel like I have the same symptoms as your describing to the tee....

abecedarian

since this thread has re-surfaced... Sin91's 2wd... all the torque converter bolts are the same. Shouldn't there have been 5 bolts the same and one different?

maybe it's a 2/4wd thing.