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GEAR RATIO, TIRE SIZE, CRAWL RATIO, ETC. CALCULATORS
This calc can be used to find any (one) missing value.
Solve for your MPH.
Solve for your RPM.
Solve for your Differential Ratio.
Solve for your Tire Diameter.
Solve for your Transmission Ratio.
Solve for your Transfer Case Ratio.
Solve for your Crawl Ratio.
If your tires are bigger than stock you probably, like myself, have spend a lot of time trying to WAG (wild ass guess) your actual MPH when going down the road. If you know your gear ratio and tire size you can get a fairly close idea here. Fill in all entries except the one you want an answer to (in green section).
If you'd like to find your overall crawl ratio, enter the Diff/Trans/TransfCase ratios. Remember, the yellow section (crawl ratio) is only for output only, do not type anything in this box.
Clicking on the Transmission or TransferCase links will jump to bottom of this page.
Formulas used
and
| These calculators are color coded by function |
| All fields Required |
Leave ONE field blank |
Supply ONLY one field |
Results Only |
Back to top
Popular Transmission Ratios
Manual
Transmissions:
AMC SR4 (Borg-Warner)
Jeep |
|
1st |
2nd |
3rd |
4th |
|
4.07 |
2.39 |
1.49 |
1.00 |
| SM 420 |
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1st |
2nd |
3rd |
4th |
|
7.00 |
3.60 |
1.70 |
1.00 |
SM 465 (MUNCIE)
GM, Chevy |
|
1st |
2nd |
3rd |
4th |
|
6.55 |
3.58 |
1.57 |
1.00 |
T-176
Jeep |
|
1st |
2nd |
3rd |
4th |
|
3.52 |
2.27 |
1.46 |
1.00 |
T-177
Jeep |
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1st |
2nd |
3rd |
4th |
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3.82 |
2.29 |
1.46 |
1.00 |
T-178
Jeep |
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1st |
2nd |
3rd |
4th |
|
3.00 |
2.08 |
1.46 |
1.00 |
Mazda 5-spd
Ford, Mazda? |
| 1st |
2nd |
3rd |
4th |
5th |
| 3.40 |
2.20 |
1.50 |
1.00 |
0.79 |
NV3500
Chevy |
| 1st |
2nd |
3rd |
4th |
5th |
| 4.02 |
2.32 |
1.40 |
1.00 |
0.73 |
NV4500
Chevy |
| 1st |
2nd |
3rd |
4th |
5th |
| 5.61 |
3.04 |
1.67 |
1.00 |
0.73 |
ZF S6-650
Chevy |
| 1st |
2nd |
3rd |
4th |
5th |
6th |
| 5.79 |
3.31 |
2.10 |
1.31 |
1.00 |
0.76 |
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Automatic
Transmissions:
TH 350
Chevy |
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1st |
2nd |
3rd |
|
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2.52 |
1.52 |
1.00 |
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TH 400
GM, Chevy, Jeep |
|
1st |
2nd |
3rd |
|
|
2.48 |
1.48 |
1.00 |
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TH 700R4
GM, Chevy |
|
1st |
2nd |
3rd |
4th |
|
3.06 |
1.62 |
1.00 |
0.70 |
4L80-E
Chevy |
| 1st |
2nd |
3rd |
4th |
|
| 3.10 |
1.48 |
1.00 |
0.75 |
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Allison 1000 Series
Chevy |
| 1st |
2nd |
3rd |
4th |
5th |
| 3.10 |
1.81 |
1.41 |
1.00 |
0.71 |
C-4/C-5/C-6
Ford |
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1st |
2nd |
3rd |
|
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2.46 |
1.46 |
1.00 |
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Ford AOD
Ford |
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1st |
2nd |
3rd |
4th |
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2.40 |
1.47 |
1.00 |
0.67 |
TORQUEFLITE 727
Jeep, Dodge |
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1st |
2nd |
3rd |
|
|
2.45 |
1.45 |
1.00 |
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Popular Transfer Case Ratios
Dana 300
Jeep |
|
Lo |
Hi |
|
|
2.62 |
1.00 |
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Borg Warner 1356
Ford |
|
Lo |
Hi |
|
|
2.69 |
1.00 |
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DANA/Spicer 18
Jeep |
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Lo |
Hi |
|
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2.46 |
1.00 |
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DANA/Spicer 20
Jeep, IH (TC-145), GM, Ford |
|
Lo |
Hi |
|
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2.00 |
1.00 |
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NP 203
Chevy, Ford, Dodge |
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Lo |
Hi |
|
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2.00 |
1.00 |
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NP 205
Chevy, Ford, Dodge, IH |
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Lo |
Hi |
|
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1.98 |
1.00 |
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NP 207/208
Jeep, Chevy, Ford, Dodge |
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Lo |
Hi |
|
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2.61 |
1.00 |
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NP 231
Jeep (YJ) |
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Lo |
Hi |
|
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2.72 |
1.00 |
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Toyota (67-74)
Land Cruiser |
|
Lo |
Hi |
|
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2.31 |
1.00 |
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