Speedometer question

[H20 Toie]

On my 89 crewcab 4x4 with 454 my speedometer is exactly 10% off, when it says 50 its really 55
60 is 66 and 70 is 77

I know years ago i could just get conversion box that went in line of the speedometer cable, does anyone still make them?

 

[shady]

Yes they do. I'll look through one of my old threads to find where I got mine

 

[shady]

I mention it but not where it came from.. I googled 'speedometer correction box' and a bunch showed up on eBay though. A couple companies selling them also

 

[sweetk30]

there used on ebay a lot . i have a few here on my desk also .