buddyralf
Well-Known Member
Hello all. Would you be able to tell me what speedo gear (number of teeth and color) I would need for my Dart. I have the 833 and a 3:73 rear gear in my 8 3/4" with a 25.3" tire. Thanks for your help.
speedo gear
- Thread starter buddyralf
- Start date
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Burntorange70
Well-Known Member
I think yearone has a speedo gear chart in there catalog.
340 Dart
I don't know ****.
I have the chart at home (at work now). If no one has replied by then I will look it up for you in the morning.:-D
buddyralf
Well-Known Member
that would be great.
According to this link, you would need a 39 tooth speedo gear. It is green.
http://www.moparts.org/Tech/tech/pages/speedo.html and then open the manual trans excel spreadsheet link.
http://www.moparts.org/Tech/tech/pages/speedo.html and then open the manual trans excel spreadsheet link.
340 Dart
I don't know ****.
Sorry, I just woke up. I was beat this morning and went straight to bed.
Here is the info I have. It doesn't list 3.73 on the chart but there is a formula near the bottom that you can use. Maybe some other members will find this info useful too.
TOOTH COLOR PN#
24 WHITE 3410024
25 BLUE 3410025
26 RED 2538926
27 WHITE 52068149
28 BLUE 52068150
29 BLACK 52068151
30 YELLOW 52068152
31 GREEN 52068153
32 BLACK 52068154
33 YELLOW 52068155
34 GREEN 52068156
35 ORANGE 52068157
36 RED 52068158
37 WHITE 52068159
38 BLUE 52068060
39 GREEN 52068061
40 ORANGE 52068062
41 RED 2538941
42 WHITE 2538942
43 BLUE 2538943
44 BLACK 2538944
45 Yellow 2538945
Speedometer Pinion Gear Chart
Source: 1972 Dodge FSM
Speedometer Pinion Gear Chart
All Car Lines - All Transmissions
Number of Teeth on Pinion Gear Listed Under Each Axle Ratio.
Tire
Size 2.45 2.71 2.76 2.93 2.94 3.21 3.23 3.54 3.55 3.91 4.10
24.06 27 29 30 32 32 35 35 38 38 42 44
24.84 26 29 29 31 31 34 34 37 37 41 43
25.15 26 28 29 31 31 33 34 37 37 41 43
25.47 25 28 28 30 30 33 33 36 36 40 42
26.01 25 27 28 30 30 32 33 36 36 39 41
26.71 24 27 27 29 29 32 32 35 35 39 40
27.34 24 26 26 28 28 31 31 34 34 37 39
27.01 24 27 27 29 29 31 32 35 35 38 40
27.71 24 26 27 28 28 31 31 34 34 38 39
28.34 26 26 28 28 30 30 33 33 37 38
28.65 25 26 27 27 30 30 33 33 36 38
28.88 25 25 27 27 29 29 32 32 35 37
24.29 26 28 29 31 31 34 34 37 37 41 43
24.78 25 28 28 30 30 33 33 36 36 40 42
25.41 25 27 28 30 30 32 33 36 36 39 41
26.97 24 26 26 28 28 31 31 34 34 37 39
23.82 25 28 28 30 30 33 33 36 37 40 42
24.24 25 28 28 30 30 33 33 36 36 40 42
24.78 25 27 28 29 29 32 32 35 35 39 41
Note: Pinions with less than 26 teeth require a different adapter than the one used for all other pinions.
Back to the tire page.
Tire Diameter Page
P155/80R13 22.76 B60-14 21.74 H60-14 24.26
P165/60R15 22.80 B60-15 22.74 H60-15 25.26
P165/70R13 22.09 B70-14 23.03 H70-14 25.97
P165/80R13 23.39 B70-15 24.03 H70-15 26.97
P175/70R13 22.65 B78-14 24.06 H78-14 27.34
P175/80R13 24.02 B78-15 25.06 H78-15 28.34
P185/70R13 23.20 C60-14 22.34 J60-14 24.50
P185/70R14 24.20 C60-15 23.34 J70-14 26.25
P185/75R14 24.93 C70-14 23.73 J78-14 27.65
P185/80R13 24.65 C70-15 24.73 L60-14 24.68
P195/60R14 23.21 C78-14 24.84 L60-15 25.68
P195/60R15 24.21 C78-15 25.84 L70-14 26.46
P195/70R13 23.75 D60-14 22.58 L78-14 27.88
P195/70R14 24.75 D60-15 23.58 M60-14 25.22
P195/75R14 25.52 D70-14 24.01 M60-15 26.22
P205/60R13 22.69 D70-15 25.01 M70-14 27.09
P205/70R14 25.30 D78-14 25.15 M70-15 28.09
P205/75R14 26.11 D78-15 26.15 M78-14 28.59
P205/75R15 27.11 E60-14 22.82 M78-15 29.59
P215/60R14 24.16 E60-15 23.82 N60-14 25.76
P215/65R15 26.00 E70-14 24.29 N60-15 26.76
P215/70R14 25.85 E70-15 25.29 N70-14 27.72
P215/75R14 26.70 E78-14 25.47 N70-15 28.72
P215/75R15 27.70 E78-15 26.47 N78-14 29.29
P225/60R15 25.63 F60-14 23.24 N78-15 30.29
P225/70R14 26.40 F60-15 24.24
P225/70R15 27.40 F70-14 24.78
P225/75R15 28.29 F70-15 25.78
P235/60R14 25.10 F78-14 26.01
P235/60R15 26.10 F78-15 27.01
P235/70R15 27.40 G60-14 23.78
P235/75R15 28.88 G60-15 24.78
P245/50R16 25.65 G70-14 25.41
P245/60R14 25.57 G70-15 26.41
P245/60R15 26.57 G78-14 26.71
P255/50R16 26.04 G78-15 27.71
P255/60R15 27.05
P255/70R15 29.06
P275/60R15 27.98
Formula
To determine the diameter of a P metric tire use this formula. Width/25.4 = width in inches. Width in inches x aspect ratio, expressed as a percentage = height of sidewall. (Height of sidewall x 2) + rim diameter = tire height.
Decoding the tire information
Let's decode an example tire, a P185/70R14. The P stands for P metric. The 185 is the width of the tire in millimeters. The 70 is the aspect ratio of the tire, in this case 70 % . The R means it is a radial, you might see a B, for bias ply on occasion. the 14 is the rim diameter.
Example formula
Let's run the formula using our example tire. 185/25.4 = 7.28. 7.28 x 70% = 5.10. (5.10 x 2) + 14 = 24.2. Our chart calls out the size as being 24.2, sucess.
Exceptions, caveats, and disclaimers
The sizes given are not all inclusive so you might need to run the formula.
The stated diameters may not correspond to an actual measurement as not all tire manufacturers adhere to this formula, precisely, case in point BFG tires tend to be wider than the designator would lead you to believe. It will get you close enough to do the job.
Back to the tire page.
Here is the info I have. It doesn't list 3.73 on the chart but there is a formula near the bottom that you can use. Maybe some other members will find this info useful too.
TOOTH COLOR PN#
24 WHITE 3410024
25 BLUE 3410025
26 RED 2538926
27 WHITE 52068149
28 BLUE 52068150
29 BLACK 52068151
30 YELLOW 52068152
31 GREEN 52068153
32 BLACK 52068154
33 YELLOW 52068155
34 GREEN 52068156
35 ORANGE 52068157
36 RED 52068158
37 WHITE 52068159
38 BLUE 52068060
39 GREEN 52068061
40 ORANGE 52068062
41 RED 2538941
42 WHITE 2538942
43 BLUE 2538943
44 BLACK 2538944
45 Yellow 2538945
Speedometer Pinion Gear Chart
Source: 1972 Dodge FSM
Speedometer Pinion Gear Chart
All Car Lines - All Transmissions
Number of Teeth on Pinion Gear Listed Under Each Axle Ratio.
Tire
Size 2.45 2.71 2.76 2.93 2.94 3.21 3.23 3.54 3.55 3.91 4.10
24.06 27 29 30 32 32 35 35 38 38 42 44
24.84 26 29 29 31 31 34 34 37 37 41 43
25.15 26 28 29 31 31 33 34 37 37 41 43
25.47 25 28 28 30 30 33 33 36 36 40 42
26.01 25 27 28 30 30 32 33 36 36 39 41
26.71 24 27 27 29 29 32 32 35 35 39 40
27.34 24 26 26 28 28 31 31 34 34 37 39
27.01 24 27 27 29 29 31 32 35 35 38 40
27.71 24 26 27 28 28 31 31 34 34 38 39
28.34 26 26 28 28 30 30 33 33 37 38
28.65 25 26 27 27 30 30 33 33 36 38
28.88 25 25 27 27 29 29 32 32 35 37
24.29 26 28 29 31 31 34 34 37 37 41 43
24.78 25 28 28 30 30 33 33 36 36 40 42
25.41 25 27 28 30 30 32 33 36 36 39 41
26.97 24 26 26 28 28 31 31 34 34 37 39
23.82 25 28 28 30 30 33 33 36 37 40 42
24.24 25 28 28 30 30 33 33 36 36 40 42
24.78 25 27 28 29 29 32 32 35 35 39 41
Note: Pinions with less than 26 teeth require a different adapter than the one used for all other pinions.
Back to the tire page.
Tire Diameter Page
P155/80R13 22.76 B60-14 21.74 H60-14 24.26
P165/60R15 22.80 B60-15 22.74 H60-15 25.26
P165/70R13 22.09 B70-14 23.03 H70-14 25.97
P165/80R13 23.39 B70-15 24.03 H70-15 26.97
P175/70R13 22.65 B78-14 24.06 H78-14 27.34
P175/80R13 24.02 B78-15 25.06 H78-15 28.34
P185/70R13 23.20 C60-14 22.34 J60-14 24.50
P185/70R14 24.20 C60-15 23.34 J70-14 26.25
P185/75R14 24.93 C70-14 23.73 J78-14 27.65
P185/80R13 24.65 C70-15 24.73 L60-14 24.68
P195/60R14 23.21 C78-14 24.84 L60-15 25.68
P195/60R15 24.21 C78-15 25.84 L70-14 26.46
P195/70R13 23.75 D60-14 22.58 L78-14 27.88
P195/70R14 24.75 D60-15 23.58 M60-14 25.22
P195/75R14 25.52 D70-14 24.01 M60-15 26.22
P205/60R13 22.69 D70-15 25.01 M70-14 27.09
P205/70R14 25.30 D78-14 25.15 M70-15 28.09
P205/75R14 26.11 D78-15 26.15 M78-14 28.59
P205/75R15 27.11 E60-14 22.82 M78-15 29.59
P215/60R14 24.16 E60-15 23.82 N60-14 25.76
P215/65R15 26.00 E70-14 24.29 N60-15 26.76
P215/70R14 25.85 E70-15 25.29 N70-14 27.72
P215/75R14 26.70 E78-14 25.47 N70-15 28.72
P215/75R15 27.70 E78-15 26.47 N78-14 29.29
P225/60R15 25.63 F60-14 23.24 N78-15 30.29
P225/70R14 26.40 F60-15 24.24
P225/70R15 27.40 F70-14 24.78
P225/75R15 28.29 F70-15 25.78
P235/60R14 25.10 F78-14 26.01
P235/60R15 26.10 F78-15 27.01
P235/70R15 27.40 G60-14 23.78
P235/75R15 28.88 G60-15 24.78
P245/50R16 25.65 G70-14 25.41
P245/60R14 25.57 G70-15 26.41
P245/60R15 26.57 G78-14 26.71
P255/50R16 26.04 G78-15 27.71
P255/60R15 27.05
P255/70R15 29.06
P275/60R15 27.98
Formula
To determine the diameter of a P metric tire use this formula. Width/25.4 = width in inches. Width in inches x aspect ratio, expressed as a percentage = height of sidewall. (Height of sidewall x 2) + rim diameter = tire height.
Decoding the tire information
Let's decode an example tire, a P185/70R14. The P stands for P metric. The 185 is the width of the tire in millimeters. The 70 is the aspect ratio of the tire, in this case 70 % . The R means it is a radial, you might see a B, for bias ply on occasion. the 14 is the rim diameter.
Example formula
Let's run the formula using our example tire. 185/25.4 = 7.28. 7.28 x 70% = 5.10. (5.10 x 2) + 14 = 24.2. Our chart calls out the size as being 24.2, sucess.
Exceptions, caveats, and disclaimers
The sizes given are not all inclusive so you might need to run the formula.
The stated diameters may not correspond to an actual measurement as not all tire manufacturers adhere to this formula, precisely, case in point BFG tires tend to be wider than the designator would lead you to believe. It will get you close enough to do the job.
Back to the tire page.
MoparBrit
HillingdonDart
Hitting the exact tire size listed and gear the calc I get is 38.66 so going to be a compromise either way you go. Closer to H22A4's reply though at 39 tooth. Speedo is still going to be a bit off either way you go, but closer to actual with the 39.
Always a brain teaser thinking which way it will go, but I think with a 39 you will show slightly faster on the speedo than you are actually going. Did I get that right? Think so.
Calc shows rpm at 70 mph at roughly 3700-3800 rpm.
Cheers
Always a brain teaser thinking which way it will go, but I think with a 39 you will show slightly faster on the speedo than you are actually going. Did I get that right? Think so.
Calc shows rpm at 70 mph at roughly 3700-3800 rpm.
Cheers
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