Gear Vendors in a '67 Barracuda, is tunnel clearancing required?

RogerCox said

I have a 67’ cuda, have a 408 stroker and 727 coming from blueprint engines. Was thinking 323 gears (Dana 60), and hoping the near 500hp would help on the low end and 323 would be good for 75-80mpg hw driving.

Would I see a dramatic increase using a GEar vendor set up?

what’s your set up and still really happy with everything?

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I’m running a 372 CID small block (340 block, 4.06” bore, 3.58” stroke) with a 4 speed manual and 3.91’s out back. The gear vendors turns my rear ratio into a 3.0ish gear when engaged and allows me to cruise comfortably on the freeway.

I would not run 3.23’s with my combo but I’m running a fairly large solid flat tappet cam and an LD340 intake with the plenum divider partially removed so it is not a torque monster and likes a bit of RPM. Your 408 should make more torque so 3.23’s around town may not be that bad.

I am still very happy with the unit and chose this path as I did not want to modify my cross member or trans tunnel to install an overdrive. My install only required some minor grinding to the gear vendor adaptor and a few small dimples in the trans tunnel.