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Old 12-03-2012, 08:10 AM   #1 (permalink)
grswat
EcoModding Lurker
 
Join Date: Jun 2008
Location: Ohio
Posts: 28

Workstar - '01 Ford Windstar SEL
90 day: 20.12 mpg (US)

2003 Expedition - '03 Ford Expedition
90 day: 14.96 mpg (US)
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Successfully unsuccessful Neon gear swap

Greetings. I recently picked up a 96 Neon SOHC auto trans to use for running my 100 mile/day courier route and for me or my wife to drive when we are going somewhere solo. I had heard that there were some different transfer gears available for the 3 spd auto and did some research. I found that the Neon came with a 1.04:1 ratio and that a lot of late 80's Chrysler's had a .91:1 gear set. I was able to find an 87 Plymouth Horizon in the junkyard with that gear set and only paid $10 for the gears so at least my investment wasn't much. Prior to the gear swap I was getting 31-34 mpg. I did the swap and dropped my 70 mph rpm from 2900 to 2400 so I was expecting a good increase. I have filled up twice and got 31.9 and 32.9 so I didn't exactly gain anything. At the very least the engine isn't as noisy and screaming at highway speeds and the acceleration didn't seem to drop much. I predict that on a long highway run the increase would be much better.

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