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Calculators

Gear Ratio Calculator

Enter the number of teeth on the Ring and Pinion gears
and click the "Calculate" button to view your results.

Ring Gear

Pinion Gear

 

Gear Ratio:

Tire Size Calculator

Enter in the fields and click the "Calculate" button to view your results.

Width

Aspect

Wheel

 

Tire Height:

 

RPM Calculator

Enter in the fields and click the "Calculate" button to view your results.

recommended RPM @ 60mph

4 cyl 2200-3200
6 cyl 2000-3000
Big Block 1600-2600
Small Block 1800-2800
Ford 6.0L 1900-2400
Ford Diesel (Non-Turbo) 1600-2500
Ford Diesel (Turbo) 1400-2200
Dodge Diesel 1400-2200
GM Diesel 6.2L 1800-2800
GM Duramax Diesel 1800-2200

Calculate

Gear Ratio

Speed

Tire Height

 

Results

Auto

AOD

Manual

5 Speed

 

Auto = D in an AOD

AOD is calculated at .70 transmission ratio

Manual = 4th in a 5 speed

5 speed is calculated at .80 transmission ratio

Calculate Specific Trans Ratio

 

Transmission Gear Ratio Chart

  1st 2nd 3rd 4th 5th 6th
Powerglide (sm. blk) 1.76 1.00        
Powerglide (big blk) 1.82 1.00        
Turbo 350 2.52 1.52 1.00      
Turbo 400 2.48 1.48 1.00      
Turbo 700R-4 3.06 1.63 1.00 0.70    
M20 (1963-65) 2.56 1.91 1.48 1.00    
M20 (1966-74) 2.52 1.88 1.46 1.00    
M21/M22 2.20 1.64 1.27 1.00    
Super T10 (S-code) 2.43 1.61 1.23 1.00    
Super T10 (W-code) 2.64 1.75 1.34 1.00    
Super T10 (P-code) 2.43 1.76 1.47 1.00    
Super T10 (U-code) 2.88 1.91 1.33 1.00    
Richmond 4+1 3.27 2.13 1.57 1.23 1.00  
Richmond 6-speed (a) 3.27 2.13 1.57 1.23 1.00 0.78
Richmond 6-speed (b) 3.01 1.88 1.46 1.19 1.00 0.62
Borg Warner T56 2.66 1.78 1.30 1.00 0.74 0.50
Borg Warner T56 3.36 2.07 1.35 1.00 0.84 0.62
Borg Warner T56 2.97 1.94 1.35 1.00 0.84 0.62
Borg Warner T56 2.97 2.07 1.43 1.00 0.80 0.62
ZF 6-speed 2.68 1.80 1.29 1.00 0.75 0.50
Toploader (close ratio) 2.32 1.69 1.29 1.00    
Toploader (wide ratio) 2.78 1.93 1.36 1.00    
Toploader (overdrive) 3.29 1.84 1.00 0.80    
200-4R 2.74 1.57 1.00 0.67    
4L60E 3.06 1.63 1.00 0.70    
4L80E 2.48 1.48 1.00 0.75    
Tremec 3550 3.27 1.98 1.34 1.00 0.68  
T-5 (F-body) V8, 83-87 2.95 1.94 1.34 1.00 0.74  
T-5 (F-body) V8, 88-92 2.95 1.94 1.34 1.00 0.73  
T-5 (F-body) 83-87 3.35 1.99 1.33 1.00 0.68  
T-5 (F-body) 88-92 3.97 2.34 1.46 1.00 0.79  
Saginaw 3 speed (all) 2.54 1.88 1.00      
Saginaw 4 speed (all) 2.20 1.64 1.47 1.00    

R&P Ratio

Tire Height

Speed

Trans Ratio

 

RPM:



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Jaw's Gear and Axle: 5630 Roseville Rd Suite D Sacramento, CA 95842