Chasing VIBRATION - please help !! (1 Viewer)
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orangefj45
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diffs rebuilt 6 months .........
which inspection plate?
which inspection plate?
Who rebuilt the gears? The rear diff cover is what I was talking about.
Something to check at least.
Can you identify if it is a front or rear vibration?
(I am assuming no but)
Something to check at least.
Can you identify if it is a front or rear vibration?
(I am assuming no but)
orangefj45
Supporting Vendor
the cover was off when i did the rear disc swap. everything looked good.
the diffs were set up by the rerend shop next-door to me. they've been in business for 30 years..........
definetly feels like it's coming from the powertrain/drivetrain. not from the front of the truck.
the diffs were set up by the rerend shop next-door to me. they've been in business for 30 years..........
definetly feels like it's coming from the powertrain/drivetrain. not from the front of the truck.
Pull front DS and go for a drive (shouldn't matter in 2wd, hubs unlocked)
Pull rear ds and go for a drive
Chock the wheels, pull both shafts and get er up to 40 or 50 and see what happens
won't be a load on anything but...
(nothin against your axle guy but I would have checked the diff, everyone has a bad day every so often)
Pull rear ds and go for a drive
Chock the wheels, pull both shafts and get er up to 40 or 50 and see what happens
won't be a load on anything but...(nothin against your axle guy but I would have checked the diff, everyone has a bad day every so often)
orangefj45
Supporting Vendor
Pull front DS and go for a drive (shouldn't matter in 2wd, hubs unlocked)
done that, no change.......
Pull rear ds and go for a drive
the new front has a resonance issue above 35 mph since the u-joint angles are different so that might not help but i did consider it. we might go to a cv front shaft as well
Chock the wheels, pull both shafts and get er up to 40 or 50 and see what happens
done that as well. there's a slight engine vibration that can be felt in any gear, including park and with no load on the power/drive-train the "driveability" vibration does not occur
(nothin against your axle guy but I would have checked the diff, everyone has a bad day every so often)
the vibration is now more noticeable than before the t-case rebuild and rear disc conversion. it's also the reason why i'm pretty bummed out about the whole situation. i consider most opf my jobs "challenges". one of the biggest reasons why i do this for a living is because i enjoy a good challenge. this is one of them and i know i'll get it figured out and fixed.
Frame straight? All 4 wheels square with frame and parallell?
orangefj45
Supporting Vendor
as far as we know, yes.
the rig is in very good condition and does not appear to ever having been in an accident. that said, it is SOA and goes on the rubicon trail more than once a year. it gets driven on the street quite a bit as well.
the rig is in very good condition and does not appear to ever having been in an accident. that said, it is SOA and goes on the rubicon trail more than once a year. it gets driven on the street quite a bit as well.
Your the man so if you say no then no it is but would it be worth having the wheels/tires balanced just too rule out the fact of a tire trying to seperate?? I chased a growl for ever on my cherokee (not vibration) but point is when I would jack it up on jack stands and put it in gear and rev it up I would have vibrations........ My scenario was the hard facing coming off the carrier and pinion bearings making a growl but point is I didnt have vibrations while driving down the road but I did when it was on jackstands..... I think it was just the nature of no load on anything????
orangefj45
Supporting Vendor
thanks for the replies and all the input/ideas. the fluid in the rear axle was cherry and there is no noise associated with the vibration.
good one, huh?!
good one, huh?!
On the post it says the vibration starts about 40 mph. I would check front end alignment. bent tube? knuckle shaft bearing going bad? toe-in?
Not sure if this was mentioned yet, but has anyone checked the flexplate, harmonic balancer??
orangefj45
Supporting Vendor
the vibration is not traveling thru the steering wheel at all, so i'm ruling out the front end. i did check the wheel bearings and had rebuilt the front axle when the diff was rebuilt 6 months ago so i'm confident that's not it. all the TREs are good, u-bolts are tight, knuckles are tight, spring bushings are good,........
orangefj45
Supporting Vendor
good points and something i've checked/pondered.
the flexplate was new when i did the auto conversion and we had no vibration then. the converter was new as well of course.
it is extreely un-common for the converter to cause a vibration and when they do, it's either because a balance weight came off or there's an internal problem. since the ford bell housing fully incloses the converter, you'd hear a loose balance weight getting tossed around and there has not ben any noise from that area.
if the converter was off balance due to an internal issue, you'd find evidence of it in the transmission pan. i had the pan off and everything looked perfect.
i do suspect that the harmonic balancer might be the culprit because there is a vibration at various RPMs with the trans in park. so when the cruiser goes to the engine shop ( for some other work ) they're supposed totake a good look at the harmonic balancer.
even if the balancer is bad and gets replaced, i feel that there's something else going on as well.
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Ah the fabled vibrations issue, I have had a simular problem or I should we have had the same problem.
We chased down every culprit, drive shafts, rear end rebuilt, changed out tires, changed caster and it still proceded to vibrate. We spent countless hours chasing this vibration with no luck.
In our case it was more of a harmonic hum at speed and felt it was a overly tight exhaust system with no play. Most new vehicles come with many weights attached to the exhaust to quiet them down?
Good luck George, I feel yur pain.
Rob
We chased down every culprit, drive shafts, rear end rebuilt, changed out tires, changed caster and it still proceded to vibrate. We spent countless hours chasing this vibration with no luck.
In our case it was more of a harmonic hum at speed and felt it was a overly tight exhaust system with no play. Most new vehicles come with many weights attached to the exhaust to quiet them down?
Good luck George, I feel yur pain.
Rob
orangefj45
Supporting Vendor
thanks rob.
i was contemplating that issue but the vibration stays pretty much the same if you're cruising at 45mph and shift down from 3rd to 2nd. that should rule out the load on the exhaust system.
ps: sorry i did'nt get a chance to say goodbye in TX this weekend, had a great time hanging out with you again!
i was contemplating that issue but the vibration stays pretty much the same if you're cruising at 45mph and shift down from 3rd to 2nd. that should rule out the load on the exhaust system.
ps: sorry i did'nt get a chance to say goodbye in TX this weekend, had a great time hanging out with you again!
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thanks rob.
i was contemplating that issue but the vibration stays pretty much the same if you're cruising at 45mph and shift down from 3rd to 2nd. that should rule out the load on the exhaust system.
ps: sorry i did'nt get a chance to say goodbye in TX this weekend, had a great time hanging out with you again!
Ours did changed when we down shifted.
Good point.
Great time, no worries I will hopefully see you guys soon.
Rob
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Sure sounds like driveline issues though. I once had a Ford pickup with a tiny crack in the rear pinion yoke. Driveshaft balanced perfectly off the truck but when you tightened it down onto the yoke it spread enough to unbalance it. I know the ujoint bolt system is different on Fords, but might be something similar going on.
Blue77FJ40
SILVER Star
I didn't see a reference to the driveshafts being checked for phase, so sorry if it has been mentioned. Were they checked for possibly being out of phase? I had an old mini truck that came from the factory with the shafts being out of phase, never had a vibration until I put on an OME kit. Once I put them back in phase, no more vibration.
