Third Generation F-Body Message Boards - Aluminum Driveshaft

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- - Aluminum Driveshaft - Fluke or Positive Side Effect (https://www.thirdgen.org/forums/transmissions-drivetrain/681116-aluminum-driveshaft-fluke-positive.html)

antares57

05-22-2013 01:12 AM

Aluminum Driveshaft - Fluke or Positive Side Effect

Recently installed a LS1 aluminum driveshaft in my '88 Firebird replacing the stock steel one. For the past year, since I got the car, I've averaged about 20mpg on the highway and 15mpg in the city. Took a recent trip and averaged 25mpg on the highway. Is this an expected result from a steel to aluminum driveshaft and may I see a similar difference in my '91 Firebird where I did the same change?

Keoman

05-22-2013 04:21 AM

Re: Aluminum Driveshaft - Fluke or Positive Side Effect

I wouldn't get my hopes up just yet, that is an unreasonable increase for the modification you performed.
Perhaps you might want a bit more than one tank full to tell you if there was any increase.
I'm not sayin there was not, just that more data seems necessary.

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