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Get an overdrive transmission. Best of both worlds. Why compromise? If you have a 4-gear, passon makes an o/d gearset or you could do a 70's/80's o/d 833 for cheap. If that doesn't sound appealing, play with this calculator:

http://vexer.com/68rt/speed.html

I've got 3.55's and a 727 and it's basically 3000rpm at 65mph. Livable but I don't like to see my motor revving that high needlessly so I have an overdrive trans in the garage waiting for me to get to it.




Overdrives are totally the way to go. A Gearvendor is pricey, but It's paying for itself each time I drive the car. 4.30's and a Gearvendor behind my 904 with 25.7" tires puts me at 70 mph @ 3100 rpm (plus or minus a mile per hour or two). I just drove my car on the first small road trip yesterday after the GV install (about 1.5 hours each way). Man it was nice. In overdrive, I have the equivalent of a 3.35 gear.