Speedometer differences

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legopnuematic

Licensed Junk Dealer
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MO
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Spencer
Truck Year
1971, 1̶9̶7̶4, 1976, 1979,1̶9̶8̶5, 2002
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Dart Swinger, Sierra 10, C10 Cheyenne, C10 Big Ten, Silverado 10, Ram 2500
Engine Size
225/6, 350 c.i., 350 c.i., 5.9l Cummins
On my 79 Big Ten it has a 100MPH speedo with no KMH, like what was put in 73-75 trucks. My 76 C10 (not F44) has a 100MPH speedo with KMH. I first thought that the speedo had been swapped in my 79, but I had seen a 79 Big Ten for sale, claiming 45xxx original miles that also has a 100MPH speedo with no KMH. This raises the question of what designated what speedo a truck got? I guess it could be a freak thing to have two 79 Big Tens with speedos swapped from an earlier truck but I doubt it. Can anyone shed some light here?
73 cluster for reference. 100MPH, no KMH. Warning light.
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This is my cluster from my 79 Big Ten, 100MPH, no KMH. No warning light. 350sbc
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Speedo from 45xxx original miles truck, also a 79 Big Ten. With warning light. 454bbc
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Speedo from my 76 C10, non F44 truck. 100MPH, with KMH. 350sbc
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Picture of 45xxx og mile truck, i'd say it is the real deal.
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78C10BigTen

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1978
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C10 BIG TEN
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350
Not sure if it helps but heres my 78 big ten.

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RetroC10Sport

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That 1979 Big 10 with 45,000 miles has a speedo from a 1973-75. 1979 has TWO warning lamps.
 

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