Audi Workshop Service and Repair Manuals

Transmission ratio

=

No. of teeth driven gear

:

No. of teeth drive gear

Ratios

Formula

iG

=

gear ratio

ZG2 :ZG1

iA

=

axle ratio

ZA2 :ZA1

iov

=

overall ratio

iG x iA

Example:

5th gear

Final drive

Drive gear

ZG1 = 40

ZA1 = 8

Driven gear

ZG2 = 24

ZA2 = 31

Calculating:

iG

=

24 : 40 = 0.600

iA

=

31 : 8 = 3.875

iov

=

(24 : 40) x (31 : 8) = 0.600 x 3.875 = 2.325