Speedometer 1994 Full Size Blazer

The speedometer in my 1994 Blazer is pinned at 85 mph and does not work. Before I pull the dash apart and start to inspect it would anyone on AF recommend a possble place to start prior to tearing it down and inspecting-?
1994 Full Size 2 Dr Blazer 5.7 V8 TBI-87,000 Miles 4WD
No Check Engine light on

is it electronic or cable driven? could be unplugged or partially unscrewed at the trasfercase..... not sure if it would stay pinned or not though.... just a thought

is it electronic or cable driven? could be unplugged or partially unscrewed at the trasfercase..... not sure if it would stay pinned or not though.... just a thought

I Appreciate thoughts it beats tear down- however, I did look at transfer case intac and looks good- Its not electronic but cable driven-I'm clueless but sounds like I will have tear down anyways just thought someone could help before-Thanks :)

The speedo is broken. You can get a replacement pretty easily from junkyards. It is a little work to get it out when you haven't done it before but you can do it yourself. I found it easier to loosen the steering column and let is hang down which makes it easier for the instrument cluster to come out.