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Diff Ratio Information

DIFF RATIO FORMULA

Larger tyre size divided x standard tyre size
35” divided by 31” = 1.1290 which = 12%

To calculate correct ratio - Standard diff size x 12%
example - 4.11 x 12% + = 4.6032

The diff ratio required is whatever closest is available to 4.6

Standard diff ratio's

Landcruiser 40 = 4.11
Landcruiser 60 = 4.11
Landcruiser 70 & 75 = 4.11
Landcruiser 78 manual R151F (split transfer case) = 4.3
Landcruiser 78 manual H150F = 4.10
Landcruiser 80 manual & auto = 4.10
Landcruiser 100 manual = 4.3
Landcruiser 100 auto = 3.9

Hilux diesel = 4.88 Hilux petrol = 4.5

Factory Nissan Patrol Ratios:

GQ 2.8 Diesel = 4.625:1
GQ 3.0 Petrol = 4.11:1
GQ 4.2 Petrol auto = 3.9:1
GQ 4.2 Petrol manual = 4.11:1 or 3.9:1
GQ 4.2 Diesel = 4.11:1

GU 2.8 Diesel = 4.625:1
GU 3.0 Turbo diesel auto = 4.375:1
GU 3.0 Turbo diesel manual= 4.11:1
GU 4.2 Diesel = 4.11:1
GU 4.2 Turbo diesel (wagon) = 3.9:1
GU 4.2 Turbo diesel (ute) = 4.11:1
GU 4.5 Petrol = 4.11:1
GU 4.8 Petrol manual = 4.375:1
GU 4.8 Petrol auto = 3.54:1

Please check you compliance plate - example below

  • HG41 = 4.11:1 - H233 Front & Rear
  • HH41 = 4.11:1 - H233 Front & H260 Rear