ok gear= what at 70
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Supreme Member
Joined: May 2002
Posts: 1,764
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From: cali
Car: 84z, 65 elcamino
Engine: l69 and a hyped up sbc in the camino
Transmission: t5 m21
Axle/Gears: 373s 411s
ok gear= what at 70
i have a 84z 5spd so nwc t5 and i would like to add 411s what rpm would i be hitting at 70 and at 80 i believe i have 373s right now. how much would my gas mileage go down
thanks
jon
thanks
jon
Member
Joined: Feb 2004
Posts: 159
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From: N.E. Ohio
Car: 88 Camaro IROC-Z
Engine: SBC 385
Transmission: 700 w/ manual valvebody & 2400 TCI
Axle/Gears: 9-bolt B&W w/ 3.70s
what size tires do you have? What gear, 5th? What RPM do you churn at 70 as of now? Give me that info and the answers to all of your questions shalt be unvieled!
Joined: Feb 2001
Posts: 13,775
Likes: 567
From: Cincinnati, OH
Car: '90 RS
Engine: 377 LSX
Transmission: Magnum T56
Since the stock speed and tach are off I would look at the calcualtions page on the main page to determine the correct RPM's you will be running.
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Joined: Oct 2002
Posts: 9,067
Likes: 1
From: Saskatoon, SK, Canada
Car: '83 Z28, '07 Charger SRT8
Engine: 454ci, 6.1 Hemi
Transmission: TH350, A5
Axle/Gears: 2.73 posi, 3.06 posi
If you have 3.73 gears now, it will probably be somewhere between 200-500rpm higher at any given speed. Gas mileage probably wont change much.
All you are doing, is going from a 11/41 ring and pinion, to a 10/41 ring and pinion... not much difference.
All you are doing, is going from a 11/41 ring and pinion, to a 10/41 ring and pinion... not much difference.
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