'95 Civic DX hatchback transmission swap?
Hello all,
I just bought a '95 Civic DX hatchback w/ 68,000 original miles (replacing my '95 VX I sold 2 weeks ago). Drove the DX back from NC to RI Friday afternoon/night and got 38.3 mpg. Drove 70-75 MPH 75% of the way, drafted buses and trucks about 25% of the way, minimal coasting, tires only inflated to 36 psi (dealer's air compressor gauge was apparently off by 8 psi...I put 44 psi in, but found it to be 36 psi when I checked it after the trip). I know the fast driving and cold air hurts FE, but I still thought I would get 40 mpg.
My intention, even before buying the car, was to swap the transmission for a VX or CRX HF transmission to lower my RPMs (man, the DX tranny is quite the high speed blender vs. the VX tranny), but an entire tranny swap seems like overkill. Since the DX and VX tranny ratios are exactly the same for 1st, 2nd and 5th gears (and 1.172 DX vs. 1.066 VX for 3rd gear, .909 DX vs. .853 VX for 4th gear), wouldn't it make more sense to simply change the final drive gear in the DX tranny from its current 4.058 to the VX's 3.25 or the HF's non-CA 2.95? A final drive is much cheaper at around $150 than a used tranny is at $300+ (plus shipping). And changing the final drive gear means I keep my 68,000 mile transmission rather than a more worn, higher mileage tranny.
With the power curve of the DX engine, should I be concerned about lowering the final drive ratio from 4.058 to 3.25 or 2.95? Is a final drive gear more labor intensive than a tranny swap? Any other parts need to be replaced in order to replace the final drive gear?
Steve
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