Hey guys like the thread says my speedometer is off, by about 8km. This is with factory tire size and a transmission only a year old. It is also a recent problem it was fine up till about last month, any ideas????

 

No ideas, only suggestion would be to disconnect the battery for 30 min to reset the computer, that's assuming an S-series blazer.

 

I have had my 2000 LT 4x4 Blazer since 2002 and mine has been off by 3mph all of its life. It doesn't get there right away only once I pick up to highway speeds...I don't try and fix a thing that as far as I'm concern isn't broken I just adjust for it...