3rd and 4th gear set for 915 gearbox. Porsche 911

31:22 - 0.71:1 ("TL" Porsche reference)
29:22 - 0.76 ("TM" Porsche reference)
28:22 - 0.79:1 ("SM" Porsche reference)
28:23 - 0.82:1 ("SN" Porsche reference) 
28:24 - 0.86:1 ("SO" Porsche reference) 
27:24 - 0.89:1 ("RO" Porsche reference) 
27:25 - 0.93:1 
26:25 - 0.96:1
26:26 - 1.00:1
25:26 - 1.04:1  
25:27 - 1.08:1 
24:27 - 1.13:1  
24:28 - 1.16:1   
23:27 - 1.17:1   
23:28 - 1.22:1   
23:29 - 1.26:1   
21:27 - 1.29:1   
22:29 - 1.32:1  
21:29 - 1.38:1   
21:30 - 1.43:1 ("LU" Porsche reference)   
21:31 - 1.48:1    
20:31 - 1.55:1   
20:32 - 1.60:1 ("KW" Porsche reference)   
20:33 - 1.65:1 
22:37 - 1.68:1 

Diagram ref no 3 and 4