[TR] Crash Gear Box

[pethier at comcast.net]

You are correct.  A "crash box" is a transmission with no syncromesh.  

Often you will hear someone describe and early TR or Sprite as having a "crash first" (implying that they have syncro on the higher gears.

Some race setups have a crash box with undercut engagement dogs with wide spacing.  They are much easier to shift without using the clutch than shifting a normal street transmission without the clutch.   Downside of these "dog boxes" is that there is a lot of slop back and forth in the driveline when cruising.  Annoying on the road, but not a factor in a race box because you are virtually always under power.


Phil Ethier West Side Saint Paul Minnesota USA
1973 Triumph Stag LE22439UB "uncle jack"
1979 Caterham Super Seven
2004 Suburban 8.1
2007 Saturn Ion 3 2.4
pethier [at] comcast [dot] net
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http://www.triumphtransamerica.org
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----- "William Brewer" <wsb1960tr3a at att.net> wrote:

> From: "William Brewer" <wsb1960tr3a at att.net>
> To: "Triumphs" <triumphs at autox.team.net>
> Sent: Tuesday, June 15, 2010 8:14:21 AM GMT -06:00 US/Canada Central
> Subject: [TR] Crash Gear Box
>
> I was reading about cars with "crash gearboxes" in an old sports car
> book. I speculate that it means no synchros, but am not sure. Can
> someone
> explain what exactly is a crash gearbox?
> 
>      -Bill in Tehachapi
> 
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