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Crawl Ratio Guide

Here is how to calculate your overall crawl ratio. It's a simple formula.

 

    Multiply your first gear, times your low range transfer case gear, times your differential gear. For example if you have:
      3.93 first gear in your transmission
      2.28 low range gear in your transfer case
      4.10 gears in your differentials
      Your crawl ratio is 3.93 X 2.28 X 4.10 = 37:1

    If you have two transfer cases then you also multiply the number by the second case like this:

      3.93 first gear in your transmission
      2.28 low range gear in your first transfer case
      4.70 low range gear in your second transfer case
      5.29 gears in your differentials
      Your crawl ratio is 3.93 X 2.28 X 4.70 X 5.29 = 223:1

Below is a list of gear ratios in popular Toyota Transmissions and Transfer cases to make it easy for you to figure your exact crawl ratio.

Land Cruiser Transmissions
Type Speeds Years First Gear
J30 3 speed 59 - 9/73 2.75
H41 4 speed 9/73 - 9/90 3.55
H41 Non-US 4 speed 9/73 - 9/90 4.93
H42 4 speed 9/80 - 9/87 3.55

Land Cruiser Transfer Case
2 speed part time case made by Asco
Years Low Range ratio
58 - 63 No low range
64 - 9/73 2.31
9/73 - 4/75 1.99
4/75 - 7/80 1.96
8/80 - 8/87 2.28
9/87+ ? Auto Transmission

 

Pickup and 4Runner Transmissions
Type Speeds Years First Gear
L43 4 speed 79 - 80 3.67
L45 4 speed 81 - 82 3.93
L50 5 speed 81 - 82 3.93
L52 5 speed 83 3.93
G52 & G54 5 speed 84 - 88 (Carb) 3.93
W56 5 speed 85 - 95 (EFI) 3.95
R151F 5 speed 86 - 87 (turbo only) 4.31
G58 5 speed 89 - 95 3.93
R150F (6 cyl) 5 speed 88+ 3.83

Pickup and 4Runner Transfer Cases
   All V6 mini trucks use the chain drive tcase and have a 2.57 low range gear. Most 4 Cylinder mini trucks use a gear drive t/case with a 2.28 low range. However some 4 cyl trucks use the V6 style chain drive case. The best way to find out what type you have is to look under your truck and cound the bolts holding the rear cover in place.
    If you have 7 bolts in the rear cover then you have the gear driven unit.
    If you have 5 bolts holding the rear cover then you have the chain drive unit.


Gear drive unit with 7 bolts pictured above.
Bolt #7 is behind the drive shaft and can't be seen in this picture.

Ratios

Truck T/case Type Years Low Range
4 cyl (most) RF1A 79 - 95 2.28
V6 (all) VF1A 87+ 2.57
Marlin Crawler RF1A 79+ 4.70

 

Crawl Ratio & Speed Calculators

(Original) Crawl Ratio & Speed Calculators
All Content Copyright Marlin Crawler 2006. All products intended for off-road use. All products guaranteed for one year against defects in materials and labor.
Prices and products subject to change without notice.