Gear calculations

GoodOleBoyzRacin · November 12th, 2008, 12:10 AM

wondering if anybody has this formula. or a link they can get to quick for me to use. im gonna order some gears for the 8.8 in the next couple of weeks. ive got a C4 that needs to be built but will be installed over the winter. gonna go ahead and do the gear swap. need to know around what gears to use with the 3 speed auto. 26-28 tall tire. stock motor with tfs stage 1 cam, edelbrock performer intake and holley 600 4bbl. after the winter hopefully ill have a set of heads and a better intake/carb. ill be spraying the car also if that makes a diff. maybe somebody has a good recomendation for a set of gears.

Sleeper_Stang_89 · November 12th, 2008, 11:54 AM

Gear Ratio Calc

maybe this will help you... 4.10's are a good all around gear...

GoodOleBoyzRacin · November 12th, 2008, 02:24 PM

ive been looking for the formula kinda like, with this gear ratio and this tire size ill be going this speed at this many rpms.

nolife · November 13th, 2008, 08:29 PM

Originally Posted by GoodOleBoyzRacin

ive been looking for the formula kinda like, with this gear ratio and this tire size ill be going this speed at this many rpms.

If you want speed AND rpm, you need a chart showing both, not a formula

This is no different then the link already shown but this is the formula used with wheel circumference (26 or 28 in your example x 3.14).

RPM = Axle x Trans X 1056 X MPH / Wheel_Circumference
MPH = RPM X Wheel_Circumference / Trans X 1056 X Axle
Axle = RPM X Wheel_Circumference / Trans X 1056 X mph

91cobra5.0 · November 13th, 2008, 08:32 PM

go with 4.10s

nolife · November 13th, 2008, 08:57 PM

Originally Posted by 91cobra5.0

go with 4.10s

Well that is the question. I think he wants the "right" rpm's at the end of the track. For some people, 4.10's and a 26 inch tire MIGHT be right but you wouldn't know unless you have an estimate of HP or something to get the rough estimate of the expected speed at the end of the 1/4 and what RPM's the car is still making decent power.

Example..
With a 26 inch tire and 4.10 @ 110 mph would be 5800 RPM.
A 28 inch tire would be 5400 RPM at 110 mph.

Sleeper_Stang_89 · November 13th, 2008, 09:00 PM

That is true! Im pretty sure theres a calculator on another site I go to, but I havent been able to get on there for like a week... they are having technical difficulties I reckon

GoodOleBoyzRacin · November 14th, 2008, 12:38 PM

gonna go with somethin shorter than 4.10's. like higher number. thanks for those nolife

November 12th, 2008, 12:10 AM	#1
GoodOleBoyzRacin Regular 1990 Mustang GT 13.64 @ 101 MPH Join Date: Jul 2008 Location: Memphis, TN Posts: 324 iTrader: 0 reviews	Gear calculations wondering if anybody has this formula. or a link they can get to quick for me to use. im gonna order some gears for the 8.8 in the next couple of weeks. ive got a C4 that needs to be built but will be installed over the winter. gonna go ahead and do the gear swap. need to know around what gears to use with the 3 speed auto. 26-28 tall tire. stock motor with tfs stage 1 cam, edelbrock performer intake and holley 600 4bbl. after the winter hopefully ill have a set of heads and a better intake/carb. ill be spraying the car also if that makes a diff. maybe somebody has a good recomendation for a set of gears. __________________ 90 Ford Mustang 5.0 T5- BROKE 1.9 60' on street tires13.64 @ 101 MPH 89 Ford Mustang coupe- http://www.youtube.com/watch?v=1nIrzcQz3_8

November 12th, 2008, 02:24 PM	#3
GoodOleBoyzRacin Regular 1990 Mustang GT 13.64 @ 101 MPH Join Date: Jul 2008 Location: Memphis, TN Posts: 324 iTrader: 0 reviews	ive been looking for the formula kinda like, with this gear ratio and this tire size ill be going this speed at this many rpms. __________________ 90 Ford Mustang 5.0 T5- BROKE 1.9 60' on street tires13.64 @ 101 MPH 89 Ford Mustang coupe- http://www.youtube.com/watch?v=1nIrzcQz3_8

November 14th, 2008, 12:38 PM	#8
GoodOleBoyzRacin Regular 1990 Mustang GT 13.64 @ 101 MPH Join Date: Jul 2008 Location: Memphis, TN Posts: 324 iTrader: 0 reviews	gonna go with somethin shorter than 4.10's. like higher number. thanks for those nolife __________________ 90 Ford Mustang 5.0 T5- BROKE 1.9 60' on street tires13.64 @ 101 MPH 89 Ford Mustang coupe- http://www.youtube.com/watch?v=1nIrzcQz3_8

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November 13th, 2008, 08:32 PM	#5
91cobra5.0 Hardcore Enthusiast 98 Cobra Join Date: Jan 2008 Location: Bay Area, Ca Posts: 2,057 iTrader: 0 reviews	go with 4.10s

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