Pulling rear end
Race Director
Joined: Jan 2002
Posts: 15,342
Likes: 2,717
From: Close to DC
C2 of the Year Finalist - Modified 2020
Can you describe the vibration a little better. Do you feel and hear it in the shifter, the steering, seat of the pants. Tire balance old or new? Look at the u-joints, then look for the balance weight on the driveshaft. Look at the half shaft u-joints. Do they look like there is rust dust at the caps? 
Dennis
Dennis
Drifting
Joined: Jan 2018
Posts: 1,255
Likes: 316
From: Western NY
If you do have to pull the diff; this is how I did mine. Not a complete step by step. One trick I learned removing the rear spring was to use a "C" clamp on the spring end to prevent the jack from skipping toward the center of the spring. Mine is a 7 leaf and it came apart easily. If under car exhaust like mine, it took some time separating the pipes. After I devolved to the point of beating on the rear pipe to separate it from the front with no joy, I ended up cutting it out and replacing
Drifting
Joined: Jan 2018
Posts: 1,255
Likes: 316
From: Western NY
Pulling the cross member did take about half a dozen wacks with a pickle fork and lump hammer but they did separate. You do want to keep the member bolts loosened but still threaded in so as to "catch" the member once it separates, couldn't hurt to keep a floor jack a 1/2" below it as well, it is a heavy component. Use anti seize on the sombrero joints when reinstalling (I use anti seize on everything applicable when I work on mine). Hopefully you will not need to do any of this but if a snot nosed kid like me can, it's doable.
Le Mans Master
Joined: Sep 2008
Posts: 5,662
Likes: 2,344
From: Lake Minnetonka, Mn
2018 C1 of Year Finalist
The time for removing the crossmember will vary from car to car depending upon its 60-year location. For some, it has taken a lot of time (read: hours); for others, not so long. My suggestion is to use a power hammer. It will unseat the cross member in all of ten seconds.
Le Mans Master
Joined: Dec 2004
Posts: 5,394
Likes: 2,767
From: Pittsburgh
2024 C2 of the Year Finalist - Modified
2023 C2 of the Year Finalist - Modified
2022 C2 of the Year Finalist - Unmodified
2019 C1 of Year Finalist (appearance mods)
67 Coupe:
My vibration was very frustrating. I checked/replaced the snubber set, strut rods, F41 rear spring (back to factory) wheels (2 new sets), rotors (setting flush), driveshaft angle, raise the floor panel to factory height at exhaust cross member (3/4"), trans mounts (good), engine mounts (good). NO LUCK!
Here is what I'm doing:
Changing out the M21 transmission to Auto, that will remove the pilot bearing all together.
New Balanced flywheel
Balancing the driveshaft
Checking and/or replacing the U-Joints
Replaced front upper and lower control arm bushings. Actually thinking that that could be the issue.
Anything else that could be a potential vibration cause has already been rebuilt. (trailing arms, etc.)
Bottom Line: you might be in for a interesting ride!
As Bluestripe had asked: Where do you feel the vibration? At your feet, in the rear-view mirror, in the seat of your pants,
My vibration was very frustrating. I checked/replaced the snubber set, strut rods, F41 rear spring (back to factory) wheels (2 new sets), rotors (setting flush), driveshaft angle, raise the floor panel to factory height at exhaust cross member (3/4"), trans mounts (good), engine mounts (good). NO LUCK!
Here is what I'm doing:
Changing out the M21 transmission to Auto, that will remove the pilot bearing all together.
New Balanced flywheel
Balancing the driveshaft
Checking and/or replacing the U-Joints
Replaced front upper and lower control arm bushings. Actually thinking that that could be the issue.
Anything else that could be a potential vibration cause has already been rebuilt. (trailing arms, etc.)
Bottom Line: you might be in for a interesting ride!
As Bluestripe had asked: Where do you feel the vibration? At your feet, in the rear-view mirror, in the seat of your pants,
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