So, ever since my EJ22/Rx trans swap, the only thing I've been very unhappy with is the gear ratios. This trans, despite the 3.70 final drive, turns about 3500 rpms at 75 mph. So I started doing some research...and found a guy using a forester 5th gear in an RX tranny.... So, after trying to find what gear ratio a forester 5MT used for 5th gear...and having no luck....I've come up with a new plan. first, some gear ratios: Gen 1 Legacy, according to '92 FSM: FWD 5MT 1: 3.545 2: 1.947 3: 1.366 4: 0.972 5: 0.738 FD: 3.70 AWD 5MT 1: 3.545 2: 1.947 3: 1.366 4: 0.972 5: 0.783 FD: 4.111 EA82, according to '89 FSM: N/A D/R 5MT 1st: 3.545 2nd: 1.947 3rd: 1.366 4th: 0.972 5th: 0.780 Final Drive: 3.90 Lo Range reduction: 1.592 RX FT4WD 5MT (What I'm currently running) 1st: 3.545 2nd: 2.111 3rd: 1.448 4th: 1.088 5th: 0.871 Final Drive: 3.70 Lo Range reduction: 1.196 Now this is all assuming that some (if not all) EJ gearsets can be used in an EA trans. EA82 N/A or AWD Legacy 1-4 (same ratios, I'm leaning towards the Legacy ones...assuming they're stronger) FWD Legacy 5th EA82 N/A lo range RX center diff and final drive (Todd seems to think a Mazda 323 GTX viscous locking center diff could be used....I think he's got one...so I plan on finding out...) This would yeild: 1: 3.545 2: 1.947 3: 1.366 4: 0.972 5: 0.738 Final Drive: 3.70 Lo range: 1.592 which would mean, on stock tires (ignoring the fact that I'll probably be on bigger ones), this means that in 5th Hi, at 75, the engine would be turning a relaxed 2900 rpms. And, when lo range is engaged, it would be like having a final drive of 5.9:1. Which means, in 5th Lo, 5k rpms would be 78 mph. Which would work out perfect for even the fastest of courses. none of those calculations take into account the fact that I'll probably be on slightly larger diameter tires aswell... AND, still keep the locking center diff. While I have it all apart, I would really like to put in a front LSD. but that'll depend on the cashflow at the time I would also like to get the gearsets cryo treated....because if this goes well, I'll be pushing some big power through it before I move on :naughty: and the coolest part, is of all those parts, the only thing I don't have, is the FWD 5MT legacy 5th gear.....that'll be a little difficult to find...but beats the hell out of buying an STi 6MT. but gives me a greater spread of gear ratios!
