Engine and Car Vibration About To Do Me In!
At my wits end right now...
Here's the story... 1967 Mercury (basically mustang) Cougar.
Frame off restoration, 12,000 miles on it.
Very mild build 302, 280HP.
New/Stock suspension, all disc brakes (SSBC).
C4, 3.55 rear.
Had some mild vibrations and certain RPMs, but was somewhat bearable.
So I decided to go with the T5 swap and upgrade manual brakes to disc brakes.
Went with Modern Driveline, hydraulic clutch, lines, master, flywheel, etc.
New driveshaft built by local reputable drive shop. Balanced it as well.
Did the swap, did the brakes, all is working.
Yet now, I have a pretty good shudder at 4,000 rpms and up and it's not fun.
It seems to be there when in neutral and revving, but hard to tell.
When driving under load, very obvious, and when push in clutch at that time, it's still is there, but can't quite be felt nearly as much.
Can feel is in floor boards, through pedals, and ***.
Driving around mildly, not there.
I tried disconnecting the new power brake booster, no change.
Checked timing, messed with it, etc., no change.
I did find two male plugs going into the dizzy cap that were bad and cracked. Fixed them and it runs better, but no change to shudder.
Swapped out old harmonic balancer for new, no change.
I'm now at a loss. Talked to Modern Driveline, they said to check u-joints being in straightly, they are.
I thought it was only engine as it seems to be there when revving, but not noticeable if it is, yet it's not there is under load (which it is present when under loan) and it lessens dramatically when pushing clutch in.
With rear jacked up, and revving up, not as noticeable, but still there.
Differential angle or drive train angle?
Bad plugs or wires?
'65 Mustang Coupe (Restored years ago..._
'05 Factory Five Racing Roadster (C*bra Replica)
'67 Cougar (Work in progress)
And multiple other ford projects...
Last edited by Brian F; 07-09-2019 at 09:04 PM.