Need advice on rear end ratio

[gregaba]

Hi
I am putting together a mild street 428 for my 63 Galaxie.
It is stock bore and stroke, aluminum heads with 2.09 1.65 valves and jayb's adapter. I am planning to run either an air gap or the trick flow intake. It has a Comp cams 280H can and assembly.
I built a C-6 with the TCI master kit and am running a TCI sizzler torque converter.
Looking at everything I think I will need a lower rear ratio then what is in the car now [3.25].
I am getting ready to order another Roush-Yates rear and need some advice.
I was thinking anything from a 3.50 to a 3.75 ratio would give me the performance on the street I want but with my combo I am not sure. 
Would like to get at least 10 MPG but can sacrifice if need be.
Greg

[cjshaker]

What size tires are you planning on running, and will it be mainly highway driving, in town, or both? Nobody ever mentions it, but tire size really affects how the rear ratio 'works' on highways and in town driving.

[gregaba]

That is still up in the air.
The car I bought was a former drag car from new. It has a narrowed 9 inch in it and I can run a tire up to 13 inch's wide.
As to the height I just havn't thought about it yet.
I know when I go to the strip I will run a M&H 10.0/26.0-15 which is 26.3 inch's OD.
For the street I will probable run as big a street tire as I can fit in the wheel well.
Probably about 29 inch's tall.
I don't know how tall the tire will be as I don't have one yet.
The car will mainly be used as a daily driver in town and highway with about ten or twelve trips to the strip a year for some fun.
Greg

[e philpott]

Tire size makes a difference, 26 to 29 is about the same difference between a 3.50 and 3.70 or more

[gregaba]

Yes you are right.
I thought the 29 inch street tire would give me a little more gas mileage on the street where the 26 inch slick would put me in the ball part for a better strip time.
I would lose a little performance on the street but I still want a good response when I hit the gas.
Greg

[Drew Pojedinec]

I know it’s some cash.....
But if you even consider it, I run a Gear vendors OD and 4.30 gears.
It really makes the car. I wouldn’t have done it any other way.

[gregaba]

I would love to have a gear venders overdrive but the only I could afford one is to buy a used one.
I have looked on the internet several times and haven't found a used one yet.
Want to sell yours[LOL]
Greg

[Drew Pojedinec]

I’d sell it, but then my driveshaft wouldn’t fit so good

[gregaba]

LOL

[FElony]

A 26-inch tire in a Galaxie wheel well is gonna look a tad small. Just sayin'. I also say put the 28x12.5 on this page  https://www.mickeythompsontires.com/drag-tires/et-street-r-bias  out back with a 4.11/4.30 gear for both street and strip. Need mileage? Drive another car. 

[Drew Pojedinec]

26's do look goofy.

Pictures of my car with 26's and the second photo with 28's

IMG_0958 by Drew Pojedinec, on Flickr

IMG_0611 by Drew Pojedinec, on Flickr

[FElony]

And NOW I say that gregaba owes me a cheezbrgr for keeping him from looking goofy. Sadly, though, we now get an outside glimpse of Drew's workshop in the second pic. Black wheels look good.

[Drew Pojedinec]

Heh, not my shop.... but it would make an awesome carb lab to take to the track.

I’d intended to restore that Shasta and tow it with my car.... call it the trailer queen.

[FElony]

Heh, not my shop....

No kidding...really?

but it would make an awesome carb lab to take to the track.

I’d intended to restore that Shasta and tow it with my car.... call it the trailer queen.

AHA! A car show dude! I knew it! I'm dialing CNN right now.

[fryedaddy]

im running a 4.11 on the street in my 66 comet,428 with 27 inch tires,c6. i stay away from the main highways because i have to turn 4000 just to do the speed limit.i had a 3.70 and sold it.i believe it would have been a good compromise.plenty of take off,but more tolerable on the highway.my vote goes for a 3.70 with 28-29 inch tires or a 3.89 with 28-29 inch tires if you want a little more take off and less highway driving.