Okay after searching long and hard trying too find a GOOD source (Transmission Center sucks) for a speedo ratio box for my truck i found a website,And when you call them someone picks up and they WILL Call you back like they say they are.

Mr. Speedometer - Shop Here Now For Gauges, Taximeters and More

they have a parts catologe with all the parts and even the correct ratio! Unlike transmission Center who could only get it close to the 1.3846 i needed and still wanted 80+SH

http://www.mrspeedometer.com/MrSpeedometerCatalogue.pdf

From what i can tell ours are 800 series

 

I need a new one too. Here is a link to the electric ones if you don't already have one.

---AutoMerged DoublePost---

They don't run over 38 dollars and all are in stock. Plus shipping. Brand names too.

---AutoMerged DoublePost---

I have to warn you, some of them are ABS speed sensors.

 

Tell them the ratio and input style and size and the out pit style and size and they will send you a brand new one. Or just the square shaft that wears out.