Probably going to be a drive line or rear end issue. Proceed with the above mentioned tests.
Dave
Vibration
- Thread starter Mudeblue
- Start date
Probably going to be a drive line or rear end issue. Proceed with the above mentioned tests.
Dave
moparnutcase
Senior Member
Check drive shaft length, that is what mine felt like.
As moparnutcase has noted, a drive line that is too long can cause significant vibration by resonating against the tail shaft of the transmission and the rear end yoke. Try taking the 4 bolts out of the rear u-joint, the drive line should move forward enough to easily clear the rear yoke. If it is bound up tight, the drive line is too long and is likely the source of your problem.
Dave
67Monaco
Old Man with a Hat
Check that the wheels are tight. Also check that the lug nut seats aren't wallered out.
moparnutcase
Senior Member
Dave, just to clarify....drive shaft being too long could be an issue, however, I stated that my problem was the drive shaft was too SHORT and was slapping around in the tail shaft.
Mudeblue
Well-Known Member
Thanks for all the good ideas but the problem is finding a shop/someone knows what they are doing. That is going to be a task in itself! Unfortunately, I can no longer physically do this type of work. First they diced me, then they marinated me and then they cooked me!
livininharrow
Senior Member
that truly sucks. hope someone recommends someone in your area. i am a thousand miles away. good luck. please let us know when and what you find.
70bigblockdodge
Old Man with a Hat
If you pull the driveshaft run the car in gear looking in the rear of the transmission to see if the mainshaft wobbles alot. I have seen a trans mainshaft bent.
Mudeblue
Well-Known Member
It vibrated before the tranny rebuilt and vibrated after the rebuild so I doubt that is the issue but thanks!
70bigblockdodge
Old Man with a Hat
Yes but checking the mainshaft for a bend or replacing it is not normally done in a rebuild. It is also very easy to see with driveshaft out.
I agree w/ Big Block Dodge on checking output shaft run out. Bearings and tail shaft bushings are usually the most likely culprits. One that is missed on occasionally is the front driveshaft yoke. The yoke will wobble on the out put shaft and bushings and bearings get the blame. Have had many cars brought to me w/ rebuilt drive shafts w/ the complaint of like yours only to find multiple problems including a worn driveshaft yoke.
tbm3fan
Old Man with a Hat
Just curious, with all this mentioning about the driveshaft, and that is were the u-joints changed out? I know a friend of mine, in the Cougar Club, sold off his yellow Cougar after endlessly trying to diagnose a vibration. He did buy another nice one later. The person who bought it, told me at one club meeting, that the problem with his car was an incorrect joint and once replaced all was fine. Just thinking as the incorrect joint was put in by the shop since the owner doesn't have that mechanical ability.
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livininharrow
Senior Member
lets just leave mudeblue alone for a bit till he absorbs all of the great info introduced to him. i would be racking my head against a wall. just my thought. i am sure he will keep us up to speed.
Incorrect u-joints installed do happen. Chinese made u-joints quality problems are common. Easy to diagnose. I agree w/ tbm3fan.
70bigblockdodge
Old Man with a Hat
I would be suspect of driveshaft since any yoke issue I have ever seen results in new yoke being welded on. Fixing a driveshaft without new yokes is like me fixing it on the floor of my shop with a hammer. The last driveshaft I cut and shortened at home has a dent.in the side from forks of high lift that put the car on and off trailers at scrap yard and runs 80mph with no vibe. That driveshaft and it's u joints are suspect.
A couple things... but a good shop should pick up on them. Check the pinion angle, especially if the springs have been changed, or if it has old saggy ones still. Also, the slip yoke could be wasted from previous use before you got the car. This would be a slip yoke being a 65, not a ball and trunion right?? I saw a problem with a ball and trunion once that was just an overabundance of grease and the problem would go away after it slung a bunch out (over 70mph driveline vibration) Good luck with it.
Mudeblue
Well-Known Member
Updat
If have gone to the internet and there it gets confusing. Some look a little different but the prices run from $6 and change to $150 and change. What am I missing? Any advice, pictures or part number would be very helpful so I order the right part>
Update: Have all four new rims, new tires, driveshaft was bent and straightened (again, second time???), new universal joints, new axels which corrected 80% of my vibration problems at 3,000 RPM's when driving but still have noticeable vibration. I was told the "transmission mount" needs replacing but shop could not locate one here locally an told me to order and they would install.
If have gone to the internet and there it gets confusing. Some look a little different but the prices run from $6 and change to $150 and change. What am I missing? Any advice, pictures or part number would be very helpful so I order the right part>
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twostick
Senior Member
Whoever is telling you they straightened a driveshaft is stealing your money.
Either find another good used one the correct length or have that one retubed.r
Kevin
Either find another good used one the correct length or have that one retubed.r
Kevin
Take a pic of the cross member and the mount. I thinkI can help you.
Mudeblue
Well-Known Member
Here is a picture. Sorry this is the best I can do because I can't get under the car.
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