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Topic: Dartsport what gears are you running (Read 129 times)
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Womanator
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Just wanted to know what gears you are running in your car.thx
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Dartsport
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I ran 4.10 gears this year. I ran 4.30 gears the previous 3 years . Paul
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FastmOp
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DID you slow down any with the change, I ran Phoenix 29.5x11.5's with the 4.30's, it would sixty mid to low 1.30's. I wore the slicks out and got a deal on some 33x10.5W's, at the same time I stuck themon I noticed I hurt the ring gear so i stuck some 4.10's in it. it hasent been better then a 1.40 yet  I really want some 4.88's to see what they will do.  |
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68_Val_Sedan
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you made a huge change to your car when you went to 33" tires and 4.10 gears
let do some math
if you would have gone to 33" tires you would have needed to go to a 4.88 gear to keep everything the same
( new gear ratio = new tires size * old gear / old tire size) (33 * 4.30 /29.5 = 4.81)
if you would want to put that into rpms or mph
rpms = mph * gear ratio * 336 / tire size 100 mph * 4.30 *336 / 29.5 = 4898 rpms
100 mph * 4.30 *336 / 33 = 4378 rpms
100 mph * 4.10 *336 / 33 = 4174 rpms
as you can see you have dropped 724 rpms @ 100 mph.
I bet the 60' times were down a little.
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67 dart 270 presently a /6 but destined to be a  ,68 Chrysler 300 Convertible 440 auto |
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Dartsport
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DID you slow down any with the change, I ran Phoenix 29.5x11.5's with the 4.30's, it would sixty mid to low 1.30's. I wore the slicks out and got a deal on some 33x10.5W's, at the same time I stuck themon I noticed I hurt the ring gear so i stuck some 4.10's in it. it hasent been better then a 1.40 yet I really want some 4.88's to see what they will do. When I switched from the 4.30 to 4.10 gears. I didn't loose any et., or 60'. They were the same. I did drop about 200 to 300 rpm in the traps. |
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Womanator
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Thx the reason I asked is I'm going to change to 4.10's and put some nitrios on it.I have 4.56 gears on now.
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505 cu. in. , Alston chassis, CRT trans, FBO Ignition, 9.458et, 141.35mph, 1.278 - 60 foot, SO FAR!! 
