2.73 gear
01-31-2014, 01:47 PM
#1
Mopar Fanatic
Thread Starter
2.73 gear
In my 68 Coronet I am running a 2.76 gear, Now that's what it had when I bought it..The car has pos traction and the 440 has good power, What gear would be good to step up to where it will have some good get up and go but then again be good to drive in town?
Last edited by raycan2; 02-26-2014 at 09:42 AM.
01-31-2014, 04:21 PM
#4
Mopar Fanatic
Thread Starter
There is a metal tag on the bolt that has the #..to make sure I did that lifting the rear and turning the tire and cou ting the rotation trick and its pretty darn close....both tire turn the same way so that tells me its a positive. .am I right?
01-31-2014, 06:19 PM
#6
Mopar Lover
ray -
You didn't mention the "H" word - highway.
I agree with Bob that for "around town" a 4.10 is pretty cool, but you have two things to worry about, since you have a big car.
1. Those cars are highway cruisers - 4.10's can get you reving up there at 60 or 70 mph - especially if you like staying there for a while. (I do.)
2. Tooling around town with a heavy foot will give you a lot of wheel spin.
I think a 3.23 - 3.55 would be your best all around gearing.
I'm running 3.23 with about 500 HP in a 2 ton+ car.
So far so good, but it's only been about 35 years
Archer
You didn't mention the "H" word - highway.
I agree with Bob that for "around town" a 4.10 is pretty cool, but you have two things to worry about, since you have a big car.
1. Those cars are highway cruisers - 4.10's can get you reving up there at 60 or 70 mph - especially if you like staying there for a while. (I do.)
2. Tooling around town with a heavy foot will give you a lot of wheel spin.
I think a 3.23 - 3.55 would be your best all around gearing.
I'm running 3.23 with about 500 HP in a 2 ton+ car.
So far so good, but it's only been about 35 years
Archer
02-01-2014, 05:07 AM
#8
2 tons and 3.54:1 for me, stick shift though. While it's not an option for me (because of the Dana) I would love to try 3.23:1. Either gear set, your seat of the pants difference is going to be lots of fun.
02-01-2014, 08:27 AM
#9
Mopar Lover
Bottom Line....It all depends on what your going to do with your car... 
I had 3.90's in my Coronet 440 with a 440 Motor and drove that car everywhere.
But for zipping around town.... I still like the old 4.10
I had 3.90's in my Coronet 440 with a 440 Motor and drove that car everywhere.
But for zipping around town.... I still like the old 4.10
Last edited by RacerHog; 02-01-2014 at 08:31 AM.
02-04-2014, 07:02 PM
#12
Mopar Lover
In my Fury, I have a 2.76:1 rear gear and the car runs at 1,800 rpm at 70 mph with 215/70/15 tires....
In my Mustang*, I have a 3.20:1 rear gear and it runs at 2,900 rpm at 70 mph with 215/75/14 tires...
The 215/70/15s are identical height/diameter as the 215/75/14 tires...
So, it depends on what you want to do with the car.
*Lost my dad this past April, and my mom gave me his totally original 72,000 mile '65 Fastback which he bought in '72....
P.S. I still want to hang out with you all!!! lol
02-06-2014, 10:14 AM
#13
ray -
You didn't mention the "H" word - highway.
I agree with Bob that for "around town" a 4.10 is pretty cool, but you have two things to worry about, since you have a big car.
1. Those cars are highway cruisers - 4.10's can get you reving up there at 60 or 70 mph - especially if you like staying there for a while. (I do.)
2. Tooling around town with a heavy foot will give you a lot of wheel spin.
I think a 3.23 - 3.55 would be your best all around gearing.
I'm running 3.23 with about 500 HP in a 2 ton+ car.
So far so good, but it's only been about 35 years
Archer
You didn't mention the "H" word - highway.
I agree with Bob that for "around town" a 4.10 is pretty cool, but you have two things to worry about, since you have a big car.
1. Those cars are highway cruisers - 4.10's can get you reving up there at 60 or 70 mph - especially if you like staying there for a while. (I do.)
2. Tooling around town with a heavy foot will give you a lot of wheel spin.
I think a 3.23 - 3.55 would be your best all around gearing.
I'm running 3.23 with about 500 HP in a 2 ton+ car.
So far so good, but it's only been about 35 years
Archer
I couldn’t agree more. those ‘high’ ratios are in the big cars for a reason. I have a two-seventy-something in my fury, too, and wouldn’t trade it for nuffin. I like that low end yank feel and I like the highway feel. With a 440, I wouldn’t even touch it unless I went to 3.23 and ONLY that low.
02-22-2014, 06:45 PM
#14
I have 2.94's on my Imperials (with large tires the gearing is probably about the same as your 2.73), and I really like the high speed cruising. 80-90-100-... it all feels relaxed, with instant acceleration upon touching the accelerator. Even the 3.23 would not compare (3500 is a true 105 mph). And low speed acceleration is still good, except for 0-20 mph. On the near stock 440 and 5200 lbs, I have clocked 20-100 mph (4800 rpm with 2nd gear was about 100) at around 17 seconds. The souped up 440 that may be coming on-line soon should do even better.
Of course, your Coronet may not have the high speed stabily of the Imperial, and you may not be interested in these speeds, but gas mileage deterioration is a fact.
02-24-2014, 08:41 AM
#16
I was once going to a mopar gathering about 50 miles south on the interstate. I remember there were a bunch of challengers and baracudas and what have you with their "performance gears" cruising on the slow lane at 55 mph. I did not have to walk around too much to check these cars out at the parking lot, because I checked them out while passing them all ... I was cruising at about 85-90 with my "grand-mom gears", and was more relaxed than they were at 55.
02-26-2014, 09:45 AM
#18
Mopar Fanatic
Thread Starter
Well I have 2.76 no 2.73 that was my typeO mistake...But we want to take the car to the strip this summer and I don't think the 2.76 is a good gear for the strip...But I want something that's gonna be good for the strip 3-4 times this summer and drive around town.
02-26-2014, 10:20 AM
#19
Ray you are not making it clear what you really want. FIRST question that was danced around is "what tires" that is what is the rear tire size / diameter?
What are you willing to spin this thing on the highway?
Some examples:
My old '70 RR "back then" had 3.54, G60x15 rear tires. This resulted in just about exactly 3000 RPM at 70mph. This was great for a 440-6 for "everyday use" as I was in San Diego and saw a LOT of trips on the freeway.
When I first put my Dart together I had a 3.89, and with the tires on it, this gave me over 3500 at 70. Even though this is not a highway cruiser, this is too much RPM for much of it, and does nothing for mileage.
I swapped in a 3.70, and this is a little better, somewhere around 3300 at 70 with a torqueflite. "Up and down" a bit with converter slip.
I'll probably end up eventually with a 3.55
There are LOTS and LOTS of "gear mph" calculators online where you can plug in tire size and gearing, and come up with a chart.
But YOU have to decide what YOU want. If you want a stop light bandit that won't see the highway, hell, put some 410's in there. If you actually want to drive somewhere once in awhile, I personally would not want more than about 3-3500 at 70 mph. On the other hand perhaps in your area there are no 70 mph freeways.
Otherwise, we are shooting at beer cans in the dark with no moon.
What are you willing to spin this thing on the highway?
Some examples:
My old '70 RR "back then" had 3.54, G60x15 rear tires. This resulted in just about exactly 3000 RPM at 70mph. This was great for a 440-6 for "everyday use" as I was in San Diego and saw a LOT of trips on the freeway.
When I first put my Dart together I had a 3.89, and with the tires on it, this gave me over 3500 at 70. Even though this is not a highway cruiser, this is too much RPM for much of it, and does nothing for mileage.
I swapped in a 3.70, and this is a little better, somewhere around 3300 at 70 with a torqueflite. "Up and down" a bit with converter slip.
I'll probably end up eventually with a 3.55
There are LOTS and LOTS of "gear mph" calculators online where you can plug in tire size and gearing, and come up with a chart.
But YOU have to decide what YOU want. If you want a stop light bandit that won't see the highway, hell, put some 410's in there. If you actually want to drive somewhere once in awhile, I personally would not want more than about 3-3500 at 70 mph. On the other hand perhaps in your area there are no 70 mph freeways.
Otherwise, we are shooting at beer cans in the dark with no moon.
02-26-2014, 10:38 AM
#20
A 2.76 will not do well in the drag strip. But is it worth compromising the car for 2 or 3 runs on the drag strip?
Engine life is also more or less proportional to rpm. Even the 3000 at 70 is excessive for a 440 imo, even if you don't care about gas mileage. If you bring this down to 2300 rpm (with your 2.76 and a typical tire size), your engine will likely last 50% as long. Not to mention, you will be able to cruise at much higher speeds.
Engine life is also more or less proportional to rpm. Even the 3000 at 70 is excessive for a 440 imo, even if you don't care about gas mileage. If you bring this down to 2300 rpm (with your 2.76 and a typical tire size), your engine will likely last 50% as long. Not to mention, you will be able to cruise at much higher speeds.
02-26-2014, 11:36 AM
#21
Mopar Fanatic
Thread Starter
Ray you are not making it clear what you really want. FIRST question that was danced around is "what tires" that is what is the rear tire size / diameter?
What are you willing to spin this thing on the highway?
Some examples:
My old '70 RR "back then" had 3.54, G60x15 rear tires. This resulted in just about exactly 3000 RPM at 70mph. This was great for a 440-6 for "everyday use" as I was in San Diego and saw a LOT of trips on the freeway.
When I first put my Dart together I had a 3.89, and with the tires on it, this gave me over 3500 at 70. Even though this is not a highway cruiser, this is too much RPM for much of it, and does nothing for mileage.
I swapped in a 3.70, and this is a little better, somewhere around 3300 at 70 with a torqueflite. "Up and down" a bit with converter slip.
I'll probably end up eventually with a 3.55
There are LOTS and LOTS of "gear mph" calculators online where you can plug in tire size and gearing, and come up with a chart.
But YOU have to decide what YOU want. If you want a stop light bandit that won't see the highway, hell, put some 410's in there. If you actually want to drive somewhere once in awhile, I personally would not want more than about 3-3500 at 70 mph. On the other hand perhaps in your area there are no 70 mph freeways.
Otherwise, we are shooting at beer cans in the dark with no moon.
What are you willing to spin this thing on the highway?
Some examples:
My old '70 RR "back then" had 3.54, G60x15 rear tires. This resulted in just about exactly 3000 RPM at 70mph. This was great for a 440-6 for "everyday use" as I was in San Diego and saw a LOT of trips on the freeway.
When I first put my Dart together I had a 3.89, and with the tires on it, this gave me over 3500 at 70. Even though this is not a highway cruiser, this is too much RPM for much of it, and does nothing for mileage.
I swapped in a 3.70, and this is a little better, somewhere around 3300 at 70 with a torqueflite. "Up and down" a bit with converter slip.
I'll probably end up eventually with a 3.55
There are LOTS and LOTS of "gear mph" calculators online where you can plug in tire size and gearing, and come up with a chart.
But YOU have to decide what YOU want. If you want a stop light bandit that won't see the highway, hell, put some 410's in there. If you actually want to drive somewhere once in awhile, I personally would not want more than about 3-3500 at 70 mph. On the other hand perhaps in your area there are no 70 mph freeways.
Otherwise, we are shooting at beer cans in the dark with no moon.
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