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Rear axle ratio... Looking for the calculator or suggestions


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Yet another question! lol

 

Still gathering parts...  My car is going to have a 351w stroked to 408, with a C4 auto. It has a 9" axle. It will be daily driven during the summer, mostly in town with very limited highway driving. Rear tires are going to be 295-50-15. I am looking for just normal driving, with the occasional quick takeoff from the stoplight when in the mood, lol! I also plan on some sort of posi or limited slip, not sure which yet in particular.

 

I had seen some sort of calculator on here before, but can't seem to find it now. I'm sure there are others in the interwebs but haven't tried looking for them yet. I have several friends, suggesting anywhere from  3.50 to 3.90's.

 

Also, any real world experience and suggestions would be great, in fact probably better than a calculator! Thanks, Earl

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Here you go:

https://www.7173mustangs.com/thread-tire-sizes--11566

 

For good street manners and no slipping clutches the Eaton/Detroit TruTrac is worth a look at:

http://www.eaton.com/Eaton/ProductsServices/Vehicle/Differentials/detroit-truetrac/index.htm

 

 

“If you can't explain it simply, you don't understand it well enough.”

--Albert Einstein

 

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3.50 if you will drive it out on the interstate any distance.

 

3.89 if you will drive it like you stole it 85% or more of the time

http://www.7173mustangs.com/gallery/1_01_07_15_8_53_18.png

 

"I love my Hookers!" and "Get some Strange" probably have a different connotation to non automotive enthusiasts!

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The cam and converter should be part of the consideration when choosing a rear gear.

73 conv. 460, D0VE large valve heads, Performer RPM manifold, Voodoo 227/233 cam, Holley 950 HP carb, C6 trans, 3.25 trak-loc.

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Yes-Cam choice and gear choice go hand in hand. Both decisions should be made together.

http://www.7173mustangs.com/gallery/1_01_07_15_8_53_18.png

 

"I love my Hookers!" and "Get some Strange" probably have a different connotation to non automotive enthusiasts!

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I am using a 3000 stall converter and 3:50 rear gears, at 60 mph my car holds about 2800 rpm. Even with the big carb it does not get bad mileage and has pretty impressive bottom end grunt. I'm glad I didn't go any higher because I do cruise more than I performance drive!!

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I am using a 3000 stall converter and 3:50 rear gears, at 60 mph my car holds about 2800 rpm. Even with the big carb it does not get bad mileage and has pretty impressive bottom end grunt. I'm glad I didn't go any higher because I do cruise more than I performance drive!!

 

I am running a 3000 stall converter with my 3.73's also. I am very close to the same 2800-3000 RPM at 60-65 mph. but who knows how accurate my speedometer is and my rear tires are pretty tall. I get pretty bad MPG. I was at 7-8 MPG but with new cam and tuned properly im up to around 10MPG.

Kevin
1971 Mach 1

408C Stroker - C4 w/3,000 stall - 8.8" Rear w/3.73's - Disc brakes all way around.

 

 

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