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Increasing MPG- replace Transmission or Rear Differential??? 700 1986

posted by raidman on Sat Apr 2 08:11 CST 2011
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last visit: Fri Apr 4 22:17 CST 2014

[RELATED]

My 86 (and wife's 89)740 has an RPM range at 65 MPH of 2700+. However my son's 93 245 has an RPM of 2100 at the same speed. Needless to say, his MPG is about 31 on the highway and mine is a lot lower.
I would like to match the lower RPM's of the 93 with my 86. Should I look for a 93 AW transmission from a 240 and swap it out, or would I do better if I can get a rearend with a higher gear ratio??
Which is the most critical component??
Thanks,
El Raidman

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Increasing MPG- replace Transmission or Rear Differential??? [700][1986]
posted by raidman on Sat Apr 2 08:11 CST 2011 >

Increasing MPG- replace Transmission or Rear Differential??? [700][1986]
posted by Volvo From Heck subscriber on Sat Apr 2 09:03 CST 2011 > V
- Increasing MPG- replace Transmission or Rear Differential??? [700][1986]
  posted by BGreyWolf on Sat Apr 2 09:21 CST 2011 > V
  - Increasing MPG- replace Transmission or Rear Differential??? [700][1986]
    posted by Volvo From Heck subscriber on Sat Apr 2 16:03 CST 2011 > V
    - Increasing MPG- replace Transmission or Rear Differential??? [700][1986]
      posted by Goatman on Sat Apr 2 16:08 CST 2011 > V
      - Increasing MPG- replace Transmission or Rear Differential??? [700][1986]
        posted by raidman on Sat Apr 2 16:21 CST 2011 > V
        
        Increasing MPG- replace Transmission or Rear Differential??? [700][1986]
        posted by TMI on Sat Apr 2 17:04 CST 2011 > V
        
        Increasing MPG- replace Transmission or Rear Differential??? [700][1986]
        posted by Goatman on Sat Apr 2 18:47 CST 2011 > V
        
        Increasing MPG- replace Transmission or Rear Differential??? [700][1986]
        posted by Goatman on Sat Apr 2 21:41 CST 2011 > V
        
        Increasing MPG- replace Transmission or Rear Differential??? [700][1986]
        posted by raidman on Sun Apr 3 21:05 CST 2011 > V
        
        Increasing MPG- replace Transmission or Rear Differential??? [700][1986]
        posted by Goatman on Sun Apr 3 21:21 CST 2011 > V
        
        Increasing MPG- replace Transmission or Rear Differential??? [700][1986]
        posted by raidman on Tue Apr 5 19:04 CST 2011 > V

Increasing MPG- replace Transmission or Rear Differential??? [700][1986]
posted by BGreyWolf on Sat Apr 2 09:13 CST 2011 > V
- Axle gearing does not affect speedo [700][1986]
  posted by Volvodad subscriber on Mon Apr 4 21:52 CST 2011 > V
  - Axle gearing does not affect speedo [700][1986]
    posted by Volvo From Heck subscriber on Tue Apr 5 06:19 CST 2011 > V
    - Axle gearing does not affect speedo [700][1986]
      posted by Volvodad subscriber on Tue Apr 5 15:06 CST 2011 > V
      - Axle gearing does not affect speedo [700][1986]
        posted by raidman on Tue Apr 5 19:09 CST 2011 > V

Increasing MPG- replace Transmission or Rear Differential??? [700][1986]
posted by dinomartino subscriber on Sat Apr 2 12:00 CST 2011 > V

Increasing MPG- replace Transmission or Rear Differential??? [700][1986]
posted by hardknocks! subscriber on Sat Apr 2 13:43 CST 2011 > V

Increasing MPG- replace Transmission or Rear Differential??? [700][1986]
posted by raidman on Sat Apr 2 16:19 CST 2011 > V

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Increasing MPG- replace Transmission or Rear Differential??? 700 1986