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Old Jun 20, 2023 | 09:52 AM
  #16  
Danger_Dave's Avatar
Danger_Dave
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Fleet Mechanic
Joined: Dec 2006
Posts: 1,338
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From: UPSTATE NY
Originally Posted by manicmechanic007
A chassis ear does not help with diagnosis of a vibration IMO
it doesnt cook rice.


Originally Posted by manicmechanic007
Sent to Tulsa from Albany? for a driveshaft balance
yes. there is diddly squat here FOR THAT.
i looked and called around the tri-state area and wasnt impressed. Denny's near buffalo? Sure, but they dont do vans/trucks....
i talked to a fellow from driveshafts inc in tulsa ok and was very satisfied plus it was only $50, but the shipping round trip was $130. This is not much more all in all than a local shop per say like where my mom lives in orlando who will charge $125 but require a round trip drive to get it done.
that was 6 months ago when i did not have the gadgets and was very confused! imagine if i could have saved $180 and how many other blokes out there can save their money by not deeming a perfectly good driveshaft as what "it must be"

Originally Posted by manicmechanic007
rear wheel bearings/pinion bearing
oh im sure listening to all (4) wheel bearings and notating they are operating perfectly and relatively the same is insufficient for that. if im getting no noise from anywhere except one particular area that is ten feet away i must be crazy. the only other time i had heard of this is where someone had a jeep and his lightbar attached to his roof was vibrating at engine speed and only at certain road speeds. the hardware was loose. this is similar to the floorpan under my feet and the nearby condition. if i drove 200 mph it would find a way to resonate even more and possibly shake other things like mirrors and whatever else is matched to that resonant frequency.
yes i have attempted to wiggle the rear flange. it does not budge.

Originally Posted by manicmechanic007
You said former senior citizen bus, that means you had better be checking driveline angles if you took the big honking box off of it
The driveline angle coming out of the trans should match the angle going into the rear end
i didnt take the box off of it. yes. the angles should be within a degree of each other on the same plane so equal opposite. it'll be impossible to get them exact at all times and on some cars the rear end does a wheelie in a sense and the pinion flange lifts in relation to the trans. shims can be installed to anticipate this change. an angle problem creates a second order vibration. I HAVE NOT MODIFIED! i do have the NVH app though and i am certain that it works.....that must not help with the diagnosis of a vibration either iyo.



 
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