[DeTomaso] Drifting Out of Third Gear - The Rest . . . . . . . of the Story

Mike Thomas mbefthomas at comcast.net
Sun Jan 29 14:06:16 EST 2017

Interesting.  I'll pass that back to Byron.  Under normal circumstances, I
can't see there being much of a risk of the lack of a boot there allowing
much debris to compromise where the shaft enters the box.

Mike Thomas
Pres., Panteras Northwest
Yellow '74 #6328

-----Original Message-----
From: Mike Drew [mailto:MikeLDrew at aol.com] 
Sent: Sunday, January 29, 2017 10:58 AM
To: Mike Thomas <mbefthomas at comcast.net>
Cc: <detomaso at server.detomasolist.com> <detomaso at server.detomasolist.com>
Subject: Re: [DeTomaso] Drifting Out of Third Gear - The Rest . . . . . . .
of the Story


Fwiw when Lloyd Butfoy rebuilds a gearbox, he removes whatever rubber boot
is on the shift linkage rod and throws it in the trash and does NOT replace
it, for the exact reason you experienced. I was surprised to see that, but
he was adamant about it. 


Sent from my iPhone

On Jan 29, 2017, at 8:51, "Mike Thomas" <mbefthomas at comcast.net> wrote:

> So, I just put out a post regarding evidence of no wear on my 
> non-steel syncros that Byron Sanborn, Vintage Racing Motors, sourced 
> from Dennis for my ZF rebuild 6 years ago (checked my records).  In 
> there I mentioned something about the box drifting out of third gear.  So,
here's the rest . .
> . . . of the story.
> I've been putting up with the box drifting out of third gear, and once 
> or twice from first, for the past 3-4 years.  It would usually be more 
> frequent the box was cold, and usually when I would lift on the 
> throttle, but unfortunately once or twice when under hard acceleration 
> (ouch).  I finally got fed up enough, after checking all my linkages 
> and replacing a broken clutch lever arm which in its' weakened state 
> prior to breaking I had attributed the third gear problem to, and 
> pulled the box for Byron to take a look.  Conversations on the phone 
> prior led him to think that I may have compromised the engagement ring 
> for some reason.  Upon cracking the case and pulling the gear set out, 
> he could see no evidence of wear, all the shifting forks were properly 
> adjusted and everything was working as it should on his bench test.  
> It wasn't until he had it buttoned back up and was working the shifter 
> in hopes of finding a solution that he noticed that the aftermarket 
> boot on the end of the shift rod at the shifter box was too thick and, 
> when pushed back as it would be for third gear, was bunching up and 
> not letting the arm move back enough to solidly engage third gear.  
> So, he ordered what he thought would be the thinner OEM boots that 
> they originally came with and which he also admitted were far too 
> fragile, but what he received was the same thicker version that I had 
> on there to start with.  I had replaced that boot myself after the
rebuild, and even then recall being told the original versions were no
longer available.
> So, he removed the collar from the shifter arm and machined the 
> backside enough to allow the arm to fully engage.  Now the pilot is 
> out, I can put it all back together and take if for a drive to see if 
> indeed this does solve the problem.  All crossable appendages crossed ;-).
> Mike Thomas
> Pres., Panteras Northwest
> Yellow '74 #6328
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