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The trick to the GV unit is that 1st over is almost
identical to close ratio 2nd gear. This allows you to hit first over when
you would normall grab second, without having to clutch or move the
shifter. Then go to 2nd over at the nest shif, then 3rd over, never
actually shifting into 4th, although the ratio in 3rd over is almost
1:1.
While the 4.56s are deep for an ordianry BB, mine's
happiest between 4500-7500 rpm. If I went to the TKO I could put 3.55s
back in and still have the same total gear ratio I currently do in first with
the 2.20 geared Muncie. As it is, I'm only going through the lights at
about 6000, where I'd like to be closer to 7000.
Devin
----- Original Message -----
Sent: Monday, May 29, 2006 11:33 AM
Subject: Re: [Chevelle-list] overdrive
thoughts
4.56 cogs are a lot of gear of a big block,unless
you're running 1/8" mile. If you run a Gear Vendors unit,the weak link is
still the Muncie trans. Not sure how one would allow a clutchless 1-2
shift,though. Herb is more familiar with the GV od unit so maybe he will add
his input.
A Tremec TKO-600 would be strong enough but have
heard they don't really like to be powershifted at 6500+ rpm. The shifter
position probably wouldn't be a problem and very little tunnel work would be
required,if any. Cost would be a wash,too. You wouldn't need a 4.56 cog with
their ratios,either.
----- Original Message -----
To all- I'm debating between 2
possibilities for an overdrive in my 64 and would like some feedback and
experiences. I'm running a 454 that is on the ragged edge of
street-ability, Muncie M21 and a 12 bolt with 4.56 gears. My primary
use is dragracing, but I drive to and from the strip, 35 miles each
way. I'm running nearly 4000 rpm on the freeway to do 65. My
thoughts are between a Tremec TKO 5 speed or a Gear Vendors overdrive.
The Gear Vendors unit has an advantage in that it allows full-throttle
upshifts, making the 1-2 shift clutchless, but leaving me with a trans that
is way underrated. I expect that someday I'll end up scattering
it. The Tremec is much stronger, but I've never seen one installed and
really don't want to move my shifter position, not to mention I don't know
how well they shift at speed. Anybody running either of these options
out there?
Devin
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