1st gear vibration

-
68 Coronet RT

68 Coronet RT

68 GTS # 508 in Registry
Joined
Nov 5, 2015
Messages
395
Reaction score
152
Location
Upstate New York
Posting for a buddy, 67 Barracuda 383 4 speed has a bad vibration taking off from a dead stop and only at low RPM shift into 2nd with higher RPM and it starts to go away 3rd and 4th no vibration. Had the tranny rebuilt and clutch, pressure plate and bearing are all new. Vibration is so bad it shakes the dash. Anyone had a similar issue?
 
Last edited:
Sounds like the clutch is slipping.
 
68 Coronet RT said:
Posting for a buddy, 67 Barracuda 383 4 speed has a bad vibration taking off from a dead stop and only at low RPM shift into 2nd with higher RPM and it starts to go away 3rd and 4th no vibration. Had the tranny rebuilt and clutch, pressure plate and bearing are all new. Vibration is so bad it shakes the dash. Anyone had a similar issue?
Click to expand...

Be sure and don’t overlook U joints. (Special attention to caps and attaching hardware)
 
I had that releasing the clutch on a 72 Demon in the 80's. My dad pulled it up against a telephone pole and burnt the clutch a bit. Completely went away. He was an old school mechanic who owned a gas station in the 50's and 60's.
 
That’s what a bad clutch does. Sounds like he bought some high clamp load, sintered bronze or ceramic dong beater clutch.

If he’s not beating on it it’s damn hard to beat a B&B cover at 2400 pounds and no assist with a good organic disc.

No reason to run anything else.
 
Daves69 said:
Did it do this before the clutch and trans were worked over?
Click to expand...
Yes that's why he had the tranny rebuilt, while the tranny was out he put everything new in. After the installation he took it for a ride, it was perfect until he got almost 50 miles on it then the vibration returned. No vibration at all until 50 miles
 
this sounds exactly like a problem i had when i was chasing a vibration at launch/engagement and low initial rpm. i had *thought* the flywheel was fine and dandy because everything else was so waxed ***. turns out it was well out of spec and ate up a fresh clutch or two before my lizard brain caught on.

but not after a rebuild and throwing a bunch of parts at it, because of course...
 
After a couple of calls to Passion and Brewers it was determined that the finish on the fly wheel after being resurfaced is too smooth creating a slip and grab condition. New flywheel on order along with a new clutch as it's glazed over.
 
Bet ya when you pull it out it has hot spots on it. You can turn them and they will look fine but they come back.
 
Had this exact issue when I switched from auto to 4 speed. Shook so bad the glove box door would open. Bought pinion angle shims for rear end housing to adjust the rear end 4 deg down and problem solved.
 
You must log in or register to reply here.
-

Back
Top