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Harvey, that's correct. The USDM WRX 5MT has a 1.1:1 step down for the rear drive. Effective rear axle ratio is 3.9:1.
mattvct, I'd suggest against using a one-piece driveshaft. There's one guy here that has one with his 5MT swap, and he's had vibration problems with it. I've read about a few WRX guys who tried one-piece driveshafts, and they had vibration problems too. The idea that the aluminum driveshaft torsional flexibility will help reduce shock is fine, but the SVX rear driveline already has tons of flexibility because the rear subframe and diff carrier bushings are very flexible. The result is that the SVX is very bouncy in low gears like other older AWD Subarus.
If you go manual, use a balanced two-piece Subaru driveshaft.
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Mychailo
:: 2006 Silver Mitsubishi Evolution 9, E85, 34 psi peak, 425wtq/505whp DJ ::
1995 Laguna Blue SVX L AWD 5MT (sold)
Visit my locker
SVX Mods: ND iridium spark plugs, Impreza RS fpr, afr tuned to 13.2:1 using a custom MAF bypass, custom exhaust, WRX 5MT w/ STi RA 1st-4th gear & stock WRX 5th gear, Exedy 13 lb flywheel & Sport Clutch, STi Group N tranny & engine mounts, urethane spacers in rear subframe, rear diff mounts, and pitch stopper, SVX Sport Strut Springs (185f/150r), custom 19 mm rear swaybar, urethane swaybar mounts, Rota Torque 17x8", 225/45-17 Proxes 4 tires, Axxis Deluxe Plus organic brake pads.
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