[TR] TR2/3 - gearshift vibration

[John & Pat Donnelly]

Hmmm... I have the HVDA conversion and I get the rattle, so not sure if the
pear shaped weight does much good. The ball end of shifter shaft has a
little ball and spring in it that's, as I understand it, put there to reduce
the rattles. Mine doesn't do it all the time, mostly when just cruising at
constant speed. It's annoying now that I've got most of the other 100+
rattles out.

Johnnie
'67 TR4A IRS

> -----Original Message-----
> From: Triumphs [mailto:triumphs-bounces at autox.team.net] On Behalf Of
> D&BLambert
> Sent: Thursday, September 04, 2014 3:12 PM
> To: triumphs at autox.team.net
> Subject: Re: [TR] TR2/3 - gearshift vibration
> 
> I've also been battling the vibrating/rattling gearshift lever on my TR3A
for some
> time now.  A few years ago (maybe 20K miles) I replaced the driveshaft
u-joints
> and had the shaft balanced.  Some months ago I got a copy of the Service
Bulletin
> (mine is a little different than the one Randal
> posted) concerning gearshift rattles and performed the recommendations:  I
> enlarged the trapezoid hole in the lever cap, and also tried the short
piece of rubber
> tubing on the lever, neither of which made a bit of difference, except for
making it
> much more difficult to shift into reverse.  I've machined some
shims/buffers out of
> Delrin for under the cap to prevent metal to metal contact in that area.
No luck.  I
> tried a stiffer/weaker gear lever spring.  No difference.  I tried
hollowing out the
> gearshift knob and epoxying in a metal slug for dampening, again no luck.
On that
> note, I have tried at least 4 different gear shift knobs (including an
original hard
> rubber one) with no change in the vibration.  The vibration and resultant
> chatter/rattle is much more sever when accelerating.  I'm now into the
habit of
> steering with one hand and holding the gear lever with the other to
somewhat
> dampen the rattle.  I'm kind of out of ideas, so I am following this
thread closely.
> Anyone have any other ideas?  Is the torpedo-shaped counter weight
available
> anywhere?  Does it really do anything? Couldn't I just make one out of a
slug of
> steel and fab a bracket of some sort, or does it have to be a certain
weight to
> cancel a specific harmonic?  I dunno....
> Any suggestions?  Perhaps I need to revisit the driveshaft/u-joints?
> Thanks for wading through this.
> Dennis
> 
> >
> > > There is a service bulletin (which
> > > I don't seem to have handy, will try to post tonight) about putting
> > > a piece of rubber hose on the shift lever inside the spring.
> >
> > Found it, finally.
> > http://goo.gl/Hpn6Rb
> >
> > >  They also tried adding a brace (later on, TR4A
> > > maybe) to the top cover, and even a rubber-mounted counterweight on
> > > some models.
> >
> > According to the TR4 SPC, the brace was all TR4 (although there were
> > two different versions); the counterweight only gearbox CT17815
> > through CT35719.
> >
> > Randall
> 
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