[Chevelle-list] overdrive thoughts

[Devin]

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