4.10 gears in an auto? Why not?
#1
4.10 gears in an auto? Why not?
Thinking about going to 4.10 gears since i need new ones anyways.
But i hear alot of people say dont higher then 3.73's in an A/4.
Why is that?
Is it because they are weaker?
But i hear alot of people say dont higher then 3.73's in an A/4.
Why is that?
Is it because they are weaker?
#2
i may be incorrect on this, but i've heard that its because you could shift into OD with a 4.10 in the 1/4 mi depending on your shift points and that is hard on the tranny....for instance if your in 3rd at 5700 rpm with a 4.10 and 26" tire your going about 107 mph....if thats your shift point and your trapping 110 in the 1/4 it would shift into OD at WOT and OD is not made for that kind of load
#6
i will be shifting at around 6000-6200 rpms with a cc306 cam and 16in wheels. I am guessing i will be around 12.5 in the Qtr.
I dont know what that translates to in the 1/4 mile as far what gear i would be in.
As it is now if i am on the Hwy i crusie at around 2500+ rpms.
I dont hit the hwy that much right now.
The car is currently a DD but it will be a weekend driver soon.
The only reaso i want to change is because i could really tell the diference going from 2.XX gears to the current 3.73's and i think the car would feel even better with 4.10's
I dont know what that translates to in the 1/4 mile as far what gear i would be in.
As it is now if i am on the Hwy i crusie at around 2500+ rpms.
I dont hit the hwy that much right now.
The car is currently a DD but it will be a weekend driver soon.
The only reaso i want to change is because i could really tell the diference going from 2.XX gears to the current 3.73's and i think the car would feel even better with 4.10's
#7
i will be shifting at around 6000-6200 rpms with a cc306 cam and 16in wheels. I am guessing i will be around 12.5 in the Qtr.
I dont know what that translates to in the 1/4 mile as far what gear i would be in.
As it is now if i am on the Hwy i crusie at around 2500+ rpms.
I dont hit the hwy that much right now.
The car is currently a DD but it will be a weekend driver soon.
The only reaso i want to change is because i could really tell the diference going from 2.XX gears to the current 3.73's and i think the car would feel even better with 4.10's
I dont know what that translates to in the 1/4 mile as far what gear i would be in.
As it is now if i am on the Hwy i crusie at around 2500+ rpms.
I dont hit the hwy that much right now.
The car is currently a DD but it will be a weekend driver soon.
The only reaso i want to change is because i could really tell the diference going from 2.XX gears to the current 3.73's and i think the car would feel even better with 4.10's
3.73's or 3.90s is about max that most people use in automatic cars
#8
4L60E, 4.10 gears, 26" tire, 3rd (1:1) gear will net you 114 MPH @ 6,050rpm. You can run a 12.5 at about 108 MPH, but allowing for traction issues, etc, it's possible you would have to be trapping a bit higher than that to run 12.5's. Your solutions would be to go to a 27" tire. Or rev it to 6,200 for 117 MPH.
#10
What is a 27" tire? I know the 255/45/16 stuff but how do i turn that into **" tire?
#12
I have the cc306 cam, i like it but you can get the same gains with a custom cam and not have to spin the motor up so high.
#14
Ex. I have 275/35/17.
275 = cross sectional width (millimeters)
35 = the ratio of sidewall height to cross sectional width (percentage)
17 = wheel diameter (inches)
Current side wall height = .35 * 275 = 96.25mm (/ 25.4 ~ 3.79")
Current wheel height = 3.79 * 2 + 17 ~24.58" (lets call it 25")
Increase by 1" (25 to 26)
have to increase sidewall hieght by .5" (* 25.4 = 12.7mm)
12.7 + 96.25 = 108.95
108.95 / 275 = .396 (close to .40)
IF my calculations and assumptions are correct. I would have to run 275/40/17 tires to roughly increase tire diameter by an inch.
#15
If you stayed with the same rim, you would have to increase the second number by the correct proportion of you tires tread width which would equal .5 inches, that will increase your tires diameter by 1".
Ex. I have 275/35/17.
275 = cross sectional width (millimeters)
35 = the ratio of sidewall height to cross sectional width (percentage)
17 = wheel diameter (inches)
Current side wall height = .35 * 275 = 96.25mm (/ 25.4 ~ 3.79")
Current wheel height = 3.79 * 2 + 17 ~24.58" (lets call it 25")
Increase by 1" (25 to 26)
have to increase sidewall hieght by .5" (* 25.4 = 12.7mm)
12.7 + 96.25 = 108.95
108.95 / 275 = .396 (close to .40)
IF my calculations and assumptions are correct. I would have to run 275/40/17 tires to roughly increase tire diameter by an inch.
Ex. I have 275/35/17.
275 = cross sectional width (millimeters)
35 = the ratio of sidewall height to cross sectional width (percentage)
17 = wheel diameter (inches)
Current side wall height = .35 * 275 = 96.25mm (/ 25.4 ~ 3.79")
Current wheel height = 3.79 * 2 + 17 ~24.58" (lets call it 25")
Increase by 1" (25 to 26)
have to increase sidewall hieght by .5" (* 25.4 = 12.7mm)
12.7 + 96.25 = 108.95
108.95 / 275 = .396 (close to .40)
IF my calculations and assumptions are correct. I would have to run 275/40/17 tires to roughly increase tire diameter by an inch.
Thanks for the break down, i never understood how to gett to that number before.