GEAR RATIO OPTIONS FOR THE EVO-4/9 TRANSMISSIONS


 

 

If you have questions or want to better understand which gears would be best for your transmission send us an email.

 

 

1ST GEAR OPTIONS:

  • EVO-8 = 2.928:1

  • EVO-9 = 2.785:1

The EVO-9 1st gear is 2.785:1 and it has 4.88% more mph over the 2.928:1 EVO-8 1st gear.

2ND GEAR OPTIONS:

  • EVO-8 = 1.950

  • EVO-9 = 1.950

Both gears are the same ratio.

3RD GEAR OPTIONS

  • EVO-8 = 1.407

  • EVO-9 = 1.444

The ratios are fairly close; the EVO-8 has 2.56% more mph over the EVO-9 3rd gear.  Some don't consider 2.56% much difference but it does and we prefer the EVO-8 3rd gear for drag racing.

4TH GEAR OPTIONS

  • EVO-8 = 1.031

  • EVO-9 = 1.096

Again the EVO-8 has 5.93% more mph over the EVO-9 4th gear.  The EVO-8 4th gear is clearly the choice to use when sticking with the stock 4.529:1 final drive. 

5TH GEAR OPTIONS

  • EVO-8 = .720:1

  • EVO-9 = .761:1

  • JDM    =  .825:1

The EVO-8 gear has 5.38% more mph than the EVO-9 and it has 12.7% more mph over the JDM .825 5th gear.  The .825 is ideal for a road race car with the 4.529:1 final drive or a daily driver with the HKS 4.111:1 final gearing because it decreases the work load the 5th gear synchro has to deal with while shortening the ratio gap between 4th-5th.

FINAL DRIVE GEAR OPTIONS

  • STOCK = 4.529:1

  • HKS     =  4.111:1

  • TRE      =  3.735:1

The stock 4.529:1 final drive is good for road racing and for an EVO that makes power above 9k but is too short for a stroker motor.

The 4.111 final drive will add 9.23%  more mph in each gear, making it ideal for drag racing or for use with 2.3 stroker motors that aren't revving to the moon and those who are drag racing their EVO.  The HKS final drive is ground after heat treat making it run quiet.

The 3.735 final drive gearset is 17.53% taller than the OEM final drive and is intended for stroker motor EVOs that are not required to rev to the moon and are making more than 485ft.lbs of torque.  Our personal choice for the 3.73 final drive gearset would be a stroker engine with a GT35R turbo with EVO-8 1st gear, EVO-9 short 3rd & 4th gears and the JDM short 5th gear.  While this wide ratio gearing is not ideal for drag racing the gearing is a pleasure to daily drive on the street/highway.

 

 

Listed below is a table showing your gear ratio options.  Remember, you can pick and choose the gearing to best suit your engine's powerband and rev range.  Tire diameter will also effect overall speed in each gear and you can custom tailor your overall speed in each gear by using larger or smaller diameter tires. The table below shows speeds in each gear with the OEM tire diameter of 25.5"

 

How fast will it go?

 

What is our choice of gearing for a 450whp EVO?

  • EVO-9 1st

  • EVO-9 2nd

  • EVO-8 3rd

  • EVO-8 4th

  • JDM    5th

  • HKS final drive

Speed in each gear @ 7500rpm on an ideal 26" diameter tire

  • 1st  = 50.6

  • 2nd = 72.5

  • 3rd  = 100.3

  • 4th  = 128.9

  • 5th   = 171.1