I recently upgraded to 4.10:1 gears, and that went smoothly, no gear whine, no problems, except this vibration I now get in 4th gear when the car hits 4500 rpms, and it stays all the way to about 5500 rpms. It does nothing of the sort in 1, 2, or 3 gears...in fact, it pulls nicely all the way to my 5500 rpm shift point, and when it had the old 2.73:1 gears, it never did it. I jumped on it a few times on the interstate, and the same thing...4500 rpms in 4th starts vibrating, and when I shift to 5th, it continues to vibrate until the rpms drop down below 4500.
I have put the car in neutral, and revved it up to 5500, and I get no vibration, so I am guessing that rules out the engine.
The car has a Ford Motorsports aluminum driveshaft. Could this be the culprit? Do they 'get out of balance', and can it be re-balanced by the appropriate shop?
Also, with 108K miles on the ticker, could this possibly be simply a sign that the transmission mount needs to be replaced?
I also have the following mods:
Eibach lowering springs
Tokico shocks and struts
Hotchkiss upper and lower control arms
Caster and camber plates
Catted X pipe
Cat back/Turbo mufflers
Under drive pulleys
Black Magic Electric Fan
Any advice on where to hunt down the source of the vibration would be welcome.
Thanks
Sir Hacksalot
I have put the car in neutral, and revved it up to 5500, and I get no vibration, so I am guessing that rules out the engine.
The car has a Ford Motorsports aluminum driveshaft. Could this be the culprit? Do they 'get out of balance', and can it be re-balanced by the appropriate shop?
Also, with 108K miles on the ticker, could this possibly be simply a sign that the transmission mount needs to be replaced?
I also have the following mods:
Eibach lowering springs
Tokico shocks and struts
Hotchkiss upper and lower control arms
Caster and camber plates
Catted X pipe
Cat back/Turbo mufflers
Under drive pulleys
Black Magic Electric Fan
Any advice on where to hunt down the source of the vibration would be welcome.
Thanks
Sir Hacksalot