Vibration at 1600-2000

[SmokeShow]

It does it accelerating or in park so it's not a u-joint. It starts around 1600-1700 and gets worse around 1900 and goes away or is much less noticable above 2000.


What might this be? Does the torque converter spin in P and N? Flexplate?



C-ya

 

[dmaxvaz]

It does it accelerating or in park so it's not a u-joint. It starts around 1600-1700 and gets worse around 1900 and goes away or is much less noticable above 2000.


What might this be? Does the torque converter spin in P and N? Flexplate?



C-ya

does it feel like it goes through the steering wheel? i have a vibration that i cant figure out either

 

[SmokeShow]

not really, more through the seat and truck itself...

 

[ripmf666]

Mitch if the truck is running the converter is spinning.have you went under while its running to see if you hear anything werd?

 

[LBZ]

Harmonic balancer on the crankshaft crapped it's pants maybe?

 

[SmokeShow]

Harmonic balancer on the crankshaft crapped it's pants maybe?

think that would be at such specific RPMs like my condition? It could be possible though as my water pump has been leaking a while and maybe caused an issue with the balancer?



no I haven't crawled under it while running to listen yet....


An observation this morning, it seems to stop when in top of 4th gear or 5th gear while driving regular. Sure wish I had an LED wired up that indicated lockup. To me, it feels like a shutter that I think is what a shuttering torque convertor might feel like. I don't know when tcc lockup occurs when just driving normal in 2wd but if it's near the top of 4th gear or in 5th, then the vibration is stopping when tcc is locked.

My guess is that the torque convertor is about toast. However, the last time the spin-on was changed, there wasn't any abnormal amount of material on the magnet. I don't think it was vibrating like this back then either. Can't remember for sure.


I'd also hate to see what my clutches look like... I've not always driven this thing in such a way that is easy on the trans. and have had my share of flared and hung shifts. Might just be time for a refresh.


C-ya
Mitch

 

[RENODMAX]

Converter is my first guess. Chattering

 

[SmokeShow]

if by chatter, you mean like a dual disk clutch in a manual truck, no. It's not like that. Just shutters/vibrates at the RPM I listed earlier....


C-ya

 

[RENODMAX]

i mean like a converter chatters when its on its way out.. shudder chatter call it what you like. converter dying. hows that

 

[Mike L.]

The only chatter you will get from a converter is the clutch during apply. If this problem started recently you can forget ballance as converters don't get out of ballance by themselves.

 

[MAXLLY]

tough issue to help with over the internet, having just done a build maybe what i ran into may be similiar? Harmonic noises are always a bitch cause they change with RPM and speed.

1. motor mounts collapsed/softened?
2. remove belt, maybe wing CP-3?
3. exhaust is stock? check for contact, sitting on frame rail? shifted in the rubber support resting on hanger?
4. Ask the wife to rev it to vibration and put 3/4" hose to ear and probe areas around the motor. Touch everything with hand to find same feeling fibration.

Good luck Man!!

 

[SmokeShow]

it was mentioned about shuttering when locking up and I can understand that... how about in park and neutral though... Is it possible that a converter that shutters at lockup can/may/will shutter at said RPM in N and P???


c-ya

 

[Mike L.]

it was mentioned about shuttering when locking up and I can understand that... how about in park and neutral though... Is it possible that a converter that shutters at lockup can/may/will shutter at said RPM in N and P???


c-ya

Not possible.

 

[E.carter]

Mine had a slight vibration as you discribe and it ended up being my 4inch exaust was laying on the crossmember. Just bent the hanger up and moved to the other whole and all is good. Hope its something easy and cheap

 

[SmokeShow]

it very well may be my exhaust, it is all kinds of F'd up at the moment... I've got a replacement system to put on when I make the time to do it...

It's not a noise though. Just a feeling. May try to log it by the weekend and see how the logs look. I've never logged my trans before though... what are recommended things to log?


C-ya

 

[Philtopgun]

exact vibration type i had, had to crawl underneath and it was a brake line that wasnt inserted into the plastic holder and would slightly vibrate during different rpm levels... wierd how the frequencies get just right to make certain things vibrate..

 

[SmokeShow]

the kicker for me is its doing it while moving AND while parked and free-revved. It is a rotational/cyclic type of vibration. Not like a hum or rattle. And it stops doing it in 4th and 5th gear cruising along at the stated RPMs. Well, I suppose it may not actually stop but I cannot feel it in those gears at the mentioned RPMs.




C-ya

 

[LBZ]

the kicker for me is its doing it while moving AND while parked and free-revved. It is a rotational/cyclic type of vibration. Not like a hum or rattle. And it stops doing it in 4th and 5th gear cruising along at the stated RPMs. Well, I suppose it may not actually stop but I cannot feel it in those gears at the mentioned RPMs.




C-ya

Hence the reason I suggested the balancer may be bad. Or maybe it spun on the shaft/sheared the :gay: stock pin. It is one of the few things common during all of those operating conditions. Downpipe or exhaust hittingthe body was mentioned I believe.
Next thing would be internals I think like a cracked crank, bolts coming loose from the flexplate (highly unlikely though) or converter bolts coming loose.

OR maybe crazy talk but,

Bent fan pulley shaft or fan hub? Just for the sake of finding nothing else, why not try removing your belt, start it and run through that rpm range and see if it goes away?

Sorry if idea's seem off the wall Mitch, but I have seen some really strange shit in my day and I find ANYTHING is possible!

 

[LBZ]

Mike, is there a bearing in the pump that could be going bad allowing the pump to wobble so to speak?

 

[SmokeShow]

Hence the reason I suggested the balancer may be bad. Or maybe it spun on the shaft/sheared the :gay: stock pin. It is one of the few things common during all of those operating conditions. Downpipe or exhaust hittingthe body was mentioned I believe.
Next thing would be internals I think like a cracked crank, bolts coming loose from the flexplate (highly unlikely though) or converter bolts coming loose.

OR maybe crazy talk but,

Bent fan pulley shaft or fan hub? Just for the sake of finding nothing else, why not try removing your belt, start it and run through that rpm range and see if it goes away?

Sorry if idea's seem off the wall Mitch, but I have seen some really strange shit in my day and I find ANYTHING is possible!

I understand and appreciate all ideas. I'm not trying to deny anyone's thoughts. I just keep adding info. as I pay more attention to it and try to make sense of it as well. May pull the belt this evening if it isn't raining when I get off to see if that changes anything. Like I said before, almost all winter I've had a leak that I really thought was the water pump but have yet to fix. I was adding as much as a gallon of antifreeze every 7-10days. Now I haven't added any in probably three weeks or so and haven't had a low coolant light nor much of a leak at all up front anymore. It has started to drip some trans. fluid from almost right under the bumper on the pass. side. I haven't investigated it more than stuck my finger in the spot to verify it is trans. fluid. I'm assuming that is a line or fitting on the trans. cooler probably leaking. Can't explain why, with warmer temps, that the coolant leak has subsided. Makes me kind of worried actually. If it were the water pump, I figured it'd get taxed more in warmer weather and increasingly leak more. Heck any leak I figured would leak worse the warmer it gets. Unless some seal somewhere swells up and thereby seals up better when warm than cold???


Just have several issues to pan out at the moment.



Thanks for helping.



As for really strange things, yep. Leave it to me to end up with something off-the-wall too. Just how things seem to roll for me.