Have you had the drive shaft balanced?
--Justin
N197TR4@cs.com wrote:
> Pile -O-Parts Collection of TR Parts...I resemble your remarks, Jack
> Wheeler.
>
> On to a diagnosis of drive line vibration in IRS TR4A w/OD, if I may solicit
> some help from the FOT. Important!!!!
>
> Subject Car: TR4A 1965 IRS with OD.
>
> Operating Conditions: Long distance high speed driving for extended periods.
>
> Symptoms: Vibration (which seems to be RPM related) at about 3000 RPM at each
> shift point and during cruise.
>
> Discussion: Seems to be a long term problem...before I became familiar with
> the car.
>
> *Overdrive unit replaced in recent years with rebuilt unit. Not known if
> condition was there before.
>
> *U-Joints replaced on 'regular basis'...this car is accumulating substantial
> miles.
>
> *Not known if driveshaft is "out of phase" or even if TR is sensitive to same.
>
> *Condition of engine and driveline mounts unknown.
>
> *Total restoration in recent years...Nut & Bolt frame off.
>
> Effect: Driveline is fairly smooth, but not necessarily 'good' at below 3,000
> RPM (indicated). Smooths out again at 3400 RPM (indicated) or better. A bit
> too fast for most roads in overdrive.
>
> This car will continue to be driven for long distances...likely another
> 10,000 miles yet this year. And more in years to come....knowing the owner.
> He deserves better.
>
> FOT? Jack Wheeler?....of course you know this driveline. Have any
> suggestions? Anyone else?
>
> (I had a 1966 TR4A IRS that I remember running to 108 MPH (non-OD) without
> this vibration and it spent most of it's life with a bit of squat to rear due
> to sagging springs)
>
> There is a 4,000 to 5,000 mile trip planned this Fall in this car. Enuff said
> here.
>
> Regards & Thanks,
>
> Joe Alexander
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