In my case, the truck is slipping out of 2nd and 3rd gears going down hill.  
The teeth are really worn down on those synchros.  
It has taken some searching for parts.  1973 Ford L8000 with a 3 speed brownie. 
 I love making junk work for me.  And I am lucky to have a son that shares my 
passion for making  junk work too.  

From: Mark Radabaugh 
Sent: Wednesday, February 27, 2019 6:35 PM
To: AnimalFarm Microwave Users Group 
Subject: Re: [AFMUG] OT Google

Not sure what you are asking.   The syncro is generally a cone and a blocker 
ring with a friction material on the inside.   The teeth on the outer part of 
the blocker ring are triangular on the front and flush at the back.   It’s not 
usually the teeth that fail, it’s the cone and friction material wearing out so 
that the pressure from the sliding hub (shift sleeve) doesn’t spin the gear up 
and the gears are still at different speeds when they engage. 

  This is a decent picture of the type I have seen:  
https://timstruckcapital.com/blog/what-are-manual-transmission-synchronizers-part-i
 

Bigger views:  https://mossmotors.com/synchro-ring-1st-2nd-gear?assoc=20067  
and https://mossmotors.com/first-gear-4?assoc=20062

Unfortunately Moss doesn’t have a picture of the sliding hub.

There are a variety of different designs so your transmission could be 
different.   I would expect parts would be pretty easy to find.

Mark



  On Feb 27, 2019, at 5:11 PM, <[email protected]> <[email protected]> wrote:

  Looking for the proper shape of synchro gear teeth when they are new.  

  I am rebuilding a dump truck transmission and don’t to replace any more of 
the synchros than I need to.  It only has trouble in two gears.

  So goggling “tranny teeth” gave me things that cannot be used in my dump 
truck.   

  Gotta use the word gear in there somewhere.  “Tranny synchro gear teeth”, 
that works just fine...
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