[DeTomaso] 2nd gear

[John Taphorn]

Fred

You are mostly correct but not entirely.  My personal school of hard knocks 
learning experience provides an interesting insight.

The first ZF that I built to put in my car would unfortunately slip out of 
third gear.  Upon disassembly, the culprit was the detent spring that backs 
up the rear most input shaft bearing.  My inexperience reassembling the ZF 
resulted in me compromising the detent spring for the 2/3 selector.  It was 
an obvious catch upon disassembly and after replacing the part and 
reassembling the ZF, everything worked fine.  Thus, the proof is in the 
pudding that those detents contribute to keeping the ZF in gear.

I suppose that I could have elaborated more on the internal workings of the 
ZF, however, it seemed prudent to first inspect potential external causes. 
If it is internal, it is most likely a broken syncro spring as my broken 
detent spring only affected 3rd..  Although, I have seen syncro springs 
busted on two ZFs that I have rebuilt, and neither driver had complained 
about the tranny jumping out of gear.

Oddly, I am rebuilding another ZF at this moment, for another member, and he 
had no clearance left between the second gear syncros; he states the ZF 
neither shifted poorly or ground while going into second gear. Go figure.

JT
----- Original Message ----- 
From: "F&D Terry" <gt5s at bcpl.net>
To: "John Taphorn" <jtaphorn at kingwoodcable.com>
Cc: <Detomaso at realbig.com>
Sent: Monday, July 16, 2007 7:53 AM
Subject: Re: [DeTomaso] 2nd gear


>I thought the springs and balls were part of an interlock to prevent 
>engaging two gears at one time as well as indexing the ZF in a selected 
>gear. The balls and springs are too small to depend on for any effort to 
>retain the transmission in gear and only provide a positive stop or index. 
>I thought that the synchronizer is responsible for holding the ZF in the 
>selected gear. There are "points" or highs on the gears of the synchronizer 
>that act as detents to hold it in or out of gear. If the edges of the teeth 
>on the gear that engage with the synchronizer as well as the mating 
>synchronizer gear teeth are chipped or worn and rounded it is then that the 
>ZF is likely to pop out of gear. Maybe I have an improper understanding.
>
> Fred T.
>
> John Taphorn wrote:
>
>>Steve
>>
>>Your memory serves you well.  However, I would be surprised to see one of 
>>those springs broken.
>>
>>Chris - Any chance that the shift linkage is being struck by the rotating 
>>halfshaft and being helped out of gear?  I'd look there first.
>>
>>JT
>>----- Original Message ----- 
>>From: "Steve Hawkins" <shawkins6 at houston.rr.com>
>>To: "'Christopher Kimball'" <chrisvkimball at msn.com>; 
>><detomaso at realbig.com>
>>Sent: Sunday, July 15, 2007 7:05 PM
>>Subject: Re: [DeTomaso] 2nd gear
>>
>>
>>
>>>If I remember correctly from when mine was appart there are some small
>>>cylinders that move as gears are changed and they hold the gears in 
>>>place.
>>>Maybe John Taphorn will jump in and correct me.
>>>
>>>Steve
>>>
>>>-----Original Message-----
>>>From: detomaso-bounces at realbig.com [mailto:detomaso-bounces at realbig.com] 
>>>On
>>>Behalf Of Christopher Kimball
>>>Sent: Sunday, July 15, 2007 7:00 PM
>>>To: detomaso at realbig.com
>>>Subject: [DeTomaso] 2nd gear
>>>
>>>
>>>I'm home for a day in between traveling and I noticed no one has 
>>>responded
>>>to a question I asked, so maybe it never made it to the forum.  Here it 
>>>is:
>>>
>>>Occasionally, my car will pop out of second gear and go into neutral for 
>>>no
>>>apparent reason.  Reverse and fifth work fine, and the shift lever isn't
>>>hitting the console before it gets fully into gear.
>>>
>>>When in neutral the shift lever moves freely so I don't think it has the
>>>extra detent some have mentioned in other forum notes.
>>>
>>>Any ideas?
>>>
>>>Thanks,
>>>
>>>Chris
>>>
>>>
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