3:73 rpm's
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Joined: Mar 2008
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From: Hudson
Car: 92' RS 25Th Anniversary
Engine: 305ci TBI
Transmission: 700R4
Axle/Gears: 10 bolt limited slip.
3:73 rpm's
What would my tach be at if I were to cruise at 60 with 3:73's and the 700R4????
Thread Starter
Junior Member
Joined: Mar 2008
Posts: 74
Likes: 0
From: Hudson
Car: 92' RS 25Th Anniversary
Engine: 305ci TBI
Transmission: 700R4
Axle/Gears: 10 bolt limited slip.
Re: 3:73 rpm's
Im not sure exactly what the tire size is but I know I have 16" rims. Im sure that their the factory tire size.
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Posts: 998
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From: Bedford Tx
Car: 1991 Z28 1LE
Engine: 370CID GenIII
Transmission: 4l60e
Axle/Gears: 4.33 Moser 9inch
Re: 3:73 rpm's
if u have 245/50/r16 tires in overdrive at 60 u will do about 2000-2100 rpms if my math is correct...
kewl 
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iTrader: (2)
Joined: Jun 2002
Posts: 168
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From: Labrador City, Newfoundland, Canada
Car: 1991 Z-28
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 3.73
Re: 3:73 rpm's
I got 245/50/16 and 3.73's...will let you knowtoday or tomorrow!!
Last edited by patricktroyz28; Jun 14, 2008 at 06:46 AM.
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From: Southern Wisconsin
Car: 1988 Camaro
Engine: 383 Stroker
Transmission: Probuilt 700 R4
Axle/Gears: 3.73
Re: 3:73 rpm's
when I had 3.73 at 60 I was doing 1800-1900 With the 3.90s right now I am doing a little under 2000 at 60 mph
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Re: 3:73 rpm's
With 25.7" tires (245/50/16), and the 700R4 in overdrive at 60 MPH you would rev the following;
2.73 -> 1500
3.08 -> 1690
3.23 -> 1775
3.42 -> 1880
3.73 -> 2050
4.10 -> 2250
4.56 -> 2500
2.73 -> 1500
3.08 -> 1690
3.23 -> 1775
3.42 -> 1880
3.73 -> 2050
4.10 -> 2250
4.56 -> 2500
Junior Member
Joined: Jun 2007
Posts: 80
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From: MN
Car: 1985 IROC-Z
Engine: 305 H.O.
Transmission: 5 Speed
Axle/Gears: 7.5" 10 bolt, 4.10, torsen posi
Re: 3:73 rpm's
RPM = MPH X Final drive ratio X 336 / Tire diameter
Tire diameter = 2 X Section width X Aspect ratio / 2540 + Wheel diameter
245(section width)/50(aspect ratio)/16(wheel diameter)
so the tire diameter is 25.65 (2 x 245 x 50/2540 + 16 )
and the rpm is 2052 (60 x (3.73 x .7) x 336 / 25.65)
Tire diameter = 2 X Section width X Aspect ratio / 2540 + Wheel diameter
245(section width)/50(aspect ratio)/16(wheel diameter)
so the tire diameter is 25.65 (2 x 245 x 50/2540 + 16 )
and the rpm is 2052 (60 x (3.73 x .7) x 336 / 25.65)
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