Main IndexAuto Repair Home Search Posts SEARCH
Who's Online WHO'S
Log in LOG

Hydra-matic transmission

  Email This Post

New User

Jun 12, 2010, 1:50 AM

Post #1 of 4 (2057 views)
Hydra-matic transmission Sign In

I have a 1955 Oldsmobile, Super 88. It has the 324 OHV V8 which has about 3000 miles on a complete rebuild (about1995). I have been working on the car since I was a kid in the 80s. I had the transmission rebuilt then. It runs and shifts fine. I have been chasing vibrations and I am down to one. I get a vibration from underneath the car from 33 up to 35 mph. It will vibrate at the same speed in second, third and forth so it is NOT dependent on engine speed. I would think this would rule out harmonic balancer, fluid coupling (torque converter), engine balancing, etc. The car will also do it without the drive shaft in so this leads me to believe it is in the transmission. Thus ruling out u-joints, tires, drums etc. I have wiggled the shaft coming out of the transmission and it seems solid. I think there is a bushing and maybe a bearing in there. Is this where I should start looking? What are the part #s and where could I locate them? In Canada? What else should I be looking at? Everybody in my small city who worked on these are no longer available due to old age or death. Please help!

Veteran / Moderator
Sidom profile image

Jun 13, 2010, 12:07 AM

Post #2 of 4 (2045 views)
Re: Hydra-matic transmission [In reply to] Sign In

You know I don't have a real good answer for you.

Not being able to feel the vibration makes it tough. I would want to be triple sure this is in fact the same vibration you are feeling with the driveline out of the car as the one its making with the driveline in the car.

I guess one thing you could try would be to take the trans mount loose & support it with a piece of wood & floor jack and see if that makes any kind of difference on the vibration....


New User

Jul 7, 2010, 1:36 PM

Post #3 of 4 (2001 views)
Re: Hydra-matic transmission [In reply to] Sign In

check your wheel bearings and the steering links,suspention components,tires for tread walk,alignment,,if those r good try turning 180 the relation of the drive line yoke to each yoke,one at a time,so flip the yoke at rear end first n drive it,if worse flip it back n try the yoke relationship at tranny output shaft,I really dont think it would b an internal prob,,,hope this helps :)

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Jul 8, 2010, 7:59 AM

Post #4 of 4 (1997 views)
Re: Hydra-matic transmission [In reply to] Sign In

I think this driveshaft may use "constant velocity" u-joints such the joints can be ok but the centering ball and spring can go bad. It would be load sensitive.

Parts? Once a member of The Oldsmobile Club of America and you can just Google it for folks who would have parts if you can't find them elsewhere. There are driveshaft specialty places that might be able to alter it to something more dependable IF and only IF that's the trouble and parts are too difficult,

Long retired now


  Email This Post

Latest Forum Post

I am having a random repeating problem with a 2007 Honda Civic. The fuse that op...

Hi everybody not mechanical at all PLEAE HELP I HAVE A 2000 FORD TAURUS SE,,,B...

2003 Chrysler mini van. 3.3 ltr 133600 mi while driving, engine light came on b...

driver side spark plugs was no problem-3 out and 3 new ones in,now it's time fo...

1998 Chevy 3500,6.5 diesel,automatic trans,4WD,1ton dump truck. Problem:Driving ...

Hello all. I am going to take my car into the shop to see if they can help me di...

Feed Button

Automotive Forum Categories
AC Auto Repair
Auto Body Repair
Auto Insurance
Automotive Repair
Automotive Wiring
Automotive World
Brake Systems
Car Care Tips
Car Racing
Car Shows and Events
Car Stereo Repair
Car Troubleshooting
Engine and Car Noises
Engine Fault Codes
Engine Troubleshooting
Exhaust System Repair
Gasoline and Motor Oils
General Discussions
Motor Vehicle Inspection
Motorcycle ATV Repairs
Motorcycle Body Repair
Motorcycle Clutch Repair
Motorcycle Engine Repair
Motorcycle Repair
Motorcycle Seat Repair
Remote Control Cars
Steering and Suspension
The Bargin Bin
Traffic Ticket Help
Tricks of the Trade
Truck Repair
Truck Repair Advice
Truck Engine Repair
Truck Suspension Repair
Car Forum - Sitemap

Search for (options) Privacy