Mopar Speedo Gear Chart

We carry many speedometer gears for Mopar transmissions.  To determine what gear you need, use the table below.  Our part #’s for mopar speedometer gears are FD0xx where xx is the tooth count of the gear.

At 60MPH, 1 tooth = 2 – 3mph.

More teeth slow the speedometer down, less teeth raise the the speedometer.  Gears with 25 teeth or less require a different speedometer adapter.

Tooth count table is accurate to within 5MPH.

Axle ratio

tire diameter 2.4 2.7 2.9 3.2 3.5 3.9 4.1 4.3 4.5
23.7 27 29 32 35 39 43 45
24.1 26 29/28 31 34 39 41/43 45
24.6 26 28 31 34 37 41 43
25.1 25 28 30 33 37 40 42
25.6 25 28 30 33 36 40 42
26.1 25 28 30 33 36 40 41/42 44 45
26.3 24 27 29 32 35 39 41
26.8 24 27 28 32 35 38 40
27.4 24 26 28 31 34 38 39
27.9 26 28 31 33 37 38 41 43
28.5 25 27 29/30 32 35 37
28.9 25 27 29/30 32 35 37
29.2 24 26 29 31 35 36
30.0 24 26 29 31 35 36 38 40

 

 

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