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| I am torn between ratios https://www.slantsix.org/forum/viewtopic.php?t=22379 |
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| Author: | Bren67Cuda904 [ Fri Mar 23, 2007 6:27 am ] |
| Post subject: | I am torn between ratios |
I can't decide between 3.21 or 3.55 gears for my 8 1/4. This car is NOT a daily driver but I would like to drive to the beach occationaly which is 1 hr of highway speeds at 70 MPH. Maybe 65 mph if I don't mind being past every 10 seconds. This car will never drive crosscountry. It'll likely only see the drag strip a few times. Is there a big seat of the pants difference between the two ratios? |
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| Author: | sandy in BC [ Fri Mar 23, 2007 7:02 am ] |
| Post subject: | |
With your build I would be at 3.91 or 4.11. With a Comp 264/9.25:1 I rarely get out of 3rd gear under 60 mph. I have to be doing at least 70 to even think about 5th. To figure ratio: tire size, target rpm(at peak torque), cruising speed. You also dont want to be below stall speed on the highway. |
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| Author: | GuyLR [ Fri Mar 23, 2007 7:12 am ] |
| Post subject: | |
What size are your tires? I had a 3.55 in my Barracuda with the A904 after having a 3.23 for many years and I could never get used to the revs on the highway. I was running 205/65-15 tires. If you will be running a taller tire then it won't be so bad. The other problem was that it ran out of Torqueflite's second gear too soon which doesn't give you a good passing gear in the 60-70 mph range. I think Slants like to pull taller gearing to make better use of their low rpm torque peak. |
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| Author: | Bren67Cuda904 [ Fri Mar 23, 2007 9:20 am ] |
| Post subject: | |
I'am going to be running 26" tires. I am going with a 2500 stall convertor. I found one that will get me by until I upgrade to the more common trans and convertor. I think the 3.55 gear is best for my plans. Not the best power but maybe the best for my plans. |
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| Author: | sireland67 [ Fri Mar 23, 2007 9:46 am ] |
| Post subject: | |
Here is a link that may help you decide. http://www.moparts.com/Tech/tech/img/AUTOMATICchart.xls |
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| Author: | NewLancerMan [ Fri Mar 23, 2007 2:55 pm ] |
| Post subject: | |
B. this is the calculator you want to use http://users.erols.com/dmapes/CALCMENU.HTM |
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| Author: | AndyZ [ Sat Apr 07, 2007 5:05 pm ] |
| Post subject: | |
With 26" tires, I would go with 3.55:1 More fun around town and at the strip but not too bad on the highway. |
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