9 bolt.....2.77 to 3.27's.....Gas Mileage Increase/Decrease?
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Member
Joined: May 2005
Posts: 375
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From: Newark, DE USA
Car: 88 IROC-Z T-Top car with Bose
Engine: L98 5.7
Transmission: 700R4
Axle/Gears: 9 Bolt with 3.27's
9 bolt.....2.77 to 3.27's.....Gas Mileage Increase/Decrease?
Hey all,
I'm changing my gears from 2.77's to 3.27's in the IROC......any anyone done this and made a note of a change in mileage? Even though I am going with a lower rear, I am thinking I will see an increase around town because the car seems to struggle when it goes into lockup mode. Any comments or experience is appreciated!
I'm changing my gears from 2.77's to 3.27's in the IROC......any anyone done this and made a note of a change in mileage? Even though I am going with a lower rear, I am thinking I will see an increase around town because the car seems to struggle when it goes into lockup mode. Any comments or experience is appreciated!
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Joined: Oct 2008
Posts: 800
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From: Temple City, CA
Car: 1990 Camaro RS
Engine: V8 305 TBI
Transmission: W/C T5
Axle/Gears: 3.08
Re: 9 bolt.....2.77 to 3.27's.....Gas Mileage Increase/Decrease?
You will lose highway mileage because the motor will be revving at a higher rpm due to the higher reduction gear being used.
Supreme Member
Joined: Apr 2006
Posts: 1,206
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From: Morganton, NC
Car: '92 T/A WS6 Vert/1956 Chevy Nomad
Engine: 350 TPI
Transmission: 700r4 w/ Transgo Kit
Axle/Gears: 3.42 LSD
Re: 9 bolt.....2.77 to 3.27's.....Gas Mileage Increase/Decrease?
With this swap:
Gas mileage = definite decrease (worse)
Fun = definite increase (better)
I think the increase in fun will far outweigh the small loss of gas mileage.
Gas mileage = definite decrease (worse)
Fun = definite increase (better)
I think the increase in fun will far outweigh the small loss of gas mileage.
Thread Starter
Member
Joined: May 2005
Posts: 375
Likes: 0
From: Newark, DE USA
Car: 88 IROC-Z T-Top car with Bose
Engine: L98 5.7
Transmission: 700R4
Axle/Gears: 9 Bolt with 3.27's
Re: 9 bolt.....2.77 to 3.27's.....Gas Mileage Increase/Decrease?
Dose anyone have window stickers that might show a difference?
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