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What is a good rear gear ratio?
#1
I am currently rebuilding a 351c, some components are aluminum heads and intake and a comp cam with 230 int/exh at 050. I am also swapping the cruise-o-matic for a 4 spd toploader. I know I need to redo my rear end gears, but I am really unsure on what a good ratio would be? I plan on driving it mainly intown and would like some getup off the line. Any suggestions would be appreciated.

'72 Mach 1
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#2
Good all around gear without a OD is a 3.50 set!
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#3
yeah 3:50-3:73 are popular for the street.

[Image: 25rnz1y.jpg]

~Buddy
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#4
I added 3.50 gears in my 72 w/a 351c and happy with it.
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#5
I have 3.90 in mine. They were in my uncles and he went with 3.50's and likes them but I liked the 3.90 better.
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#6
I agree with Tnfastback, 3.91:1 if you can find them these days. Most makers have gone to 3.89:1, close enough. It depends on what you want the car to do and what you are willing to trade to make it do it. In 78 I was driving an R code Mach to work with a 4.86:1 gear in it. A real hoot but very radical.

Good Luck,
Chuck
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#7
Putting 3:50-1 in the mach right now...

"Life is what you make it......"
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#8
3.50s
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#9
Check out roushyatesparts.com, they have several used gearsets in kinda odd ratios but you cannot beat the price. I'm looking at a 3.22:1 set. Their sets are all deburred and polished.

Jeff T.

Low buck, touring style, '73 Convertible "rolling restoration", 351c, 2v heads with a shave and a haircut, Performer intake, Holley 650(ish), roller rockers, screw in studs, guideplates, stainless valves, Duraspark / Motorsports MSD, T-5 conversion. 1-1/8" front, 3/4" rear swaybars KYB shocks and some home brewed subframe connectors. Future plans; JGC steering box, Cobra brakes and... paint, interior, etc.

When I die I want to die like grandpa, peacefully in my sleep... not screaming, like his passenger.

[Image: 1_12_09_14_10_15_11.png]
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#10
I have 3.50 non posi. Does it or will it make a big difference by adding posi traction instead? when you first take off does posi make a big difference (pick up wise) as far as racing someone in town?

Thanks,
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