gear ratio suggestions

[70sbee]

i have a 70 bee with a 440 and 4speed it currently has 4.56 gears which is a little extreme was wanting to get either a 3.73 or a 3.91 wondering if i could get some input on what other people have tested and tried and came up with motor is 10:1 decent cam nothing crazy also wondering what the best tire size wheel offset works best on these cars i wanna get the biggest street/sick i can get under it without doing any choping of the body!!!

 

[WileE]

IMO a 3.55 is the right compromise. I'm running 3.91 now, not good on highway use. I wouldn't bother unless to go to at least the 3.73.

 

[BIGSHCLUNK]

I'd have to ask whats your intent?? Light to light racing? Hwy cruzin?

 

[hunt2elk]

I'm running 3.91's with 28" tall tires in my RR. It's fun in town, but not the greatest @ 60mph. About 3200rpm if I remember correctly. On my current Charger build, I am using the stock 3.54's in the Dana, to be more highway friendly.

 

[benno440]

i am running 3:55, 27" tire 295 wide.

goes good in town and highway. i ave a 4 speed and in 3rd gear doing 35mph i sit on 1200 rpm, and she still smokes 1st and 2nd

 

[Sweet5ltr]

4.10 with 30" tire. Feels like a 3.91. I wouldn't go lower than a 3.91 with a four speed and a 4.10 with an automatic. saving 200-400RPM on the interstate at 65MPH isn't going to break into a new stratosphere of increased fuel economy when you are already running 3000(+/-)RPM..

 

[Meep-Meep]

With my 440 and a 270 deg cam (advertized) on a 112 lobe separation it really likes 3.55's. I'd take a good look at your cam power band and plan accordingly. My car is an auto and weighs 4000 lbs going down the road.

 

[Jasoncoronet]

I run 3.55 in my 68 Coronet with a 275/60/15. In my opinion I wish I had a little less gear. Great around town but pretty slow on the freeway. You have plenty of tourque you can push what ever gear you want.

 

[A383Wing]

go here --> http://vexer.com/automotive-tools/speed-rpm-calculator

input yer numbers and play around with it....

Bryan

 

[Mr.SpeedFreak]

+1 to the 3.55 crowd. Heard from a of lot old mopar buddies that it's a great middle ground for highway cruising and street driving. I'll be moving to 3.55 from the 3.23 I have now

 

[bm02tj]

I have a 9 1/4 with 321 and was thinking I will run 355 when I rebuild my 73 SSP the factory rear was a 8 1/4 with 276 and did not live well with a 400

 

[Ghosty]

+1 to the 3.55 crowd. Heard from a of lot old mopar buddies that it's a great middle ground for highway cruising and street driving. I'll be moving to 3.55 from the 3.23 I have now

Great info in this thread. I have a '69 440 6-pack car w/ auto, but plan on putting in a 4spd. eventually. It's got an 8 3/4 4.10 rear now, but I definitely wanna re-gear for more cruising/highway, regardless if I stay auto or not. Will be raced occasionally for fun, but nothing serious. Motor is fresh w/ a 295/.507 cam.

Just debating between 3.23 & 3.55. Will that 3.23 feel too sluggish for street cruising? I know I have enough torque but don't want it to be a total dog off the line. So leaning towards 3.55.

 

[Roadbird]

I have a 9 1/4 too with 3.55 gear ratio and it's a sure grip too. Anybody interested in buying it? Came out of a 1975 C body is what I was told. Was considering to use this on my 70RR but came across and bought a 3.23 gear ratio in a 489 case. I also have a 742 casing only from the same guy here on the forums.