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Vibration at idle in drive

I'm gonna double check the balancer and drop the tranny shield and make sure the flexplate and TC bolts look ok. Then I'll breathe easy. If it needs motor mounts, that may motivate me to lift the truck, I mean if you gotta drop the diff anyway, it's stupid not to lift it...:D
 
It's very noticeable. Only in drive. I looked under it today. Nothing hitting the frame that I can see and the balancer looks ok. I wonder if the tranny is going. could that be a sign ?
 
there are good vibrations and there are bad vibrations. good vibrations started in the 60's. if you If you could tell us when these vibrations first manifested themselves then this would help. Is it possible that the exhaust is touching the frame. I have good vibrations since they installed my ATT. Reason being I believe my down pipe may be just touching the frame as in barely and my symptoms are very similar to yours. I don't worry about my vibrations as they started at the same time as the ATT. I should see if it can't be fixed though. Ed
 
Checked the whole exhaust with the truck in gear. Not touching. Motor mounts "looked" ok. The weird thing is it has not being doing it today. it seems to be there worse after I get off the highway then sit at a light or something. It's never something simple...:suicide:
 
Idle speed too low? Rolling in drive allows idle speed to rise.
 
I was real bad today when I got home. I think something is coming apart in the tranny. If it were the balancer or flywheel I would think it would not matter in reverse. If I put it in L1 it almost seems to get slightly worse. it's real noticeable now but it doesn't always do it. I'm gonna run it by a tranny shop maybe tomorrow and let them look at it.
 
My friend's wife's car the TCC solenoid was sticking on. The engine would stall when coming to a stop, like you stopped a manual trans vehicle without pushing the clutch in. A new TCC solenoid solved the issue.

I suppose it could be possible Kenny.
 
Guy at the tranny shop said bring it in around 7:30am tomorrow when I get off the highway and it's doing it but he has never heard of a tranny causing what I describe. Unless it is a motormount and I'm not seeing it. I had some one jerk the motor in drive and revese both ways and the mounts look tight to me.The balancer has me nervous but only in drive ??? The balancer would do it no matter what me thinks.
 
It could be fueling related. When in drive it has a different load that idle and reverse. Watch the fuel rate and timing when in idle park, versus idle reverse, versus idle drive. It may reveal a weak spot in your IP.
 
I'll try. i give carcode a whirl tonight . It's not a miss or rough idle, just a vibration like a bent flexplate except it only does it randomly in drive. I was gonna try jacking the motor just a bit while in drive at idle and see if it eliminates the problem. I'm gonna pull the tranny cover as well and see what the flexplate is doing. I gotta figure out how to find fuel rates in carcode. Zgod i wish this thing was odb1. GMTDScan works so much better.
 
Well the plot thickens and once again shows, nothing simple ever happens to me. Always gotta be some PIA weird thing but I think I am close. Got in it around 4:30pm. Drove down the road a few miles, no vibration at the stop light. Jumped on the highway and drove home. Pulled in the driveway. with my foot on the brake in drive bad vibration. Again not in reverse or idle. So with the truck in park I put a jack with a block of wood under the bellhousing and jacked up the tranny/motor a bit. Not a whole lot but and inch or two. Put the truck back into drive with . Vibration is gone. To confirm with the drive in drive, parking brake set and wheels chocked, I get out of the truck and let the jack down, vibration returns full force. Now either the jack is absorbing it through the block of wood , or the motor mount is shot. I double checked every inch of the exhaust right to the turbo. Not touching anywhere even close and exh system is stock with all rubber isolator hangers.
Pretty much at this point I am leaning towards motor mount but what I am at a loss to explain is why does it go away after the truck sits and then comes back after some driving ?? WTF ???
 
The rubber looks fine and it's not moving. It's gotta be the drivers side MM because that is the one that is hard to change and the power steering line is leaking oil on it. Of course If I have to drop the front diff to change it then it's stupid not to put a lift in at the same time and I just happen to be getting a parts truck with a 6 inch lift..tsk tsk...what to do...
 
That would be the luck. Lol. And yea your damn right, might as well put the lift kit on while you are in there. We did a 6 inch lift on my dads suburban about a year ago. That was a 14 hr marathon install even with having a lift to work on.
 
No, The parts truck has 35's so they will go on the CUCV and I will get new 33's for the burb and use the redneck wheels from the CUCV. The Burb is an orangey red so with them Redneck General Lee wheels and maybe a big ole 01 on the doors ...I'm set...:rof:
 
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