Re: 4K tranny - .75 or .80 5th??

[Brett Van Sprewenburg <brett@shell.netacc.net>]

> In a message dated 1/23/01 12:03:12 AM Pacific Standard Time, 
> thescirocco@juno.com writes:
> 
> 
> > I'm deciding between .71 and .75 for my 3.94:1 2H, and I'm leaning
> > towards the .71 5th gear, out of my RIP '81 S.
> > 
> > With 3.67:1, I'd use the .75 or .80 5th gear.
> > With 3.89 and 3.94:1, I'd use a .71 or .75 5th gear.
> > ...Depending on if I want an overdrive 5th gear or not.
> > 
> > 
> 
> Another consideration is that the .75 is a fine tooth gear and is more likely 
> to break. The .71 should be a coarse tooth...not sure about the .80, but I 
> suspect it isn;t quite as fine as .75 ...but it depends on the tooth count.
> 
> Mike
> http://www.geocities.com/vwmikel

I heard this also, and when I got the .75 gear, looking at it you could tell
it was a slightly 'finer' cut gear, but didn't appear weak because of it
though.  I have heard of very high HP cars stripping gears occasionally,
and all of our cars probably chip a reverse gear (a straight cut non-syncho
mesh gear), but how much torque could we possibly be putting on 5th?  Enough
to cause helical cut mesh gears to break off?  Seemed an unlikely enough 
occurance to me, I'm not worried about it, especially because it's 5th...not
one of the gears I'm likely to _really_ bang around anyway.  I'll be the first
to report it if I blow out my 5th gear though! :)

==Brett


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