NP203 Speedometer Gear

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rwolf10

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Jun 23, 2022
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Location
kansas
First Name
Richard
Truck Year
1987
Truck Model
k10
Engine Size
5.7
I have a np203 t-case on my truck that is on 35s and has 3.73 gears. At 45mph on the dash, I'm going 55mph actual. After pulling apart the gears I see I have a 19 tooth steel driven gear and a 7 tooth red plastic drive gear. Found with some calculating I need either a 15 tooth steel driven gear to match the plastic gear, or a 9 tooth plastic drive gear to match the steel driven gear- both of which do not exist. Any ideas on what to do in my situation? Thanks!
 

geardaddy

Junior Member
Joined
May 31, 2022
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Location
st. paul mn
First Name
mike
Truck Year
97
Truck Model
several
Engine Size
350
I have a np203 t-case on my truck that is on 35s and has 3.73 gears. At 45mph on the dash, I'm going 55mph actual. After pulling apart the gears I see I have a 19 tooth steel driven gear and a 7 tooth red plastic drive gear. Found with some calculating I need either a 15 tooth steel driven gear to match the plastic gear, or a 9 tooth plastic drive gear to match the steel driven gear- both of which do not exist. Any ideas on what to do in my situation? Thanks!
I have 2 of the 15 tooth driven gears. if interested give me a call 612-309-3999
 

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