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  1. R

    I've had my obs 1999 GMC C2500 suburban with l29 454 vortec 3.73 gears for 6 years, stock 245/75/16 tires the speedo read to high this is from ecm

    It's GT4
  2. R

    I've had my obs 1999 GMC C2500 suburban with l29 454 vortec 3.73 gears for 6 years, stock 245/75/16 tires the speedo read to high this is from ecm

    A programmer as well
  3. R

    I've had my obs 1999 GMC C2500 suburban with l29 454 vortec 3.73 gears for 6 years, stock 245/75/16 tires the speedo read to high this is from ecm

    Not sure about the gearing yet but I did remember right after I bought it I had to have the rear brakes replaced drums and all. I had to wait a day extra bc the drums they ordered were slightly to small. Not sure if it has a whole different axle in it or what. Or they just goofed on ordering...
  4. R

    I've had my obs 1999 GMC C2500 suburban with l29 454 vortec 3.73 gears for 6 years, stock 245/75/16 tires the speedo read to high this is from ecm

    Yes I had a bluetooth FIXD reader but it crapped out on me I took a screen shot while it was reading 55 on the app and rpms were reading 1765.6 but the cluster was reading like 1900
  5. R

    I've had my obs 1999 GMC C2500 suburban with l29 454 vortec 3.73 gears for 6 years, stock 245/75/16 tires the speedo read to high this is from ecm

    Gt4 g80
  6. R

    I've had my obs 1999 GMC C2500 suburban with l29 454 vortec 3.73 gears for 6 years, stock 245/75/16 tires the speedo read to high this is from ecm

    It's gt4 g80 its a C2500 and the door sticker says 10ply 245/75/r16. GPS while driving reads that my 55 mph is 64ish on the cluster the same speed that the pcm/ecm reads from the obd2 plug.
  7. R

    I've had my obs 1999 GMC C2500 suburban with l29 454 vortec 3.73 gears for 6 years, stock 245/75/16 tires the speedo read to high this is from ecm

    K thanks I will try that after I get paid this coming weekend to get another obd2 reader as my old obd2 bluetooth reader has crapped out.
  8. R

    I've had my obs 1999 GMC C2500 suburban with l29 454 vortec 3.73 gears for 6 years, stock 245/75/16 tires the speedo read to high this is from ecm

    Yeah I have to go 64ish to actually going 55 it's off all the way up but less at lower speeds not sure if someone put a different rear end gear in it before I had it or if someone had the whole cluster replaced with the wrong one? Would either one do something like that?
  9. R

    I've had my obs 1999 GMC C2500 suburban with l29 454 vortec 3.73 gears for 6 years, stock 245/75/16 tires the speedo read to high this is from ecm

    Sry still a little out of it from having back surgery earlier today, the cluster reads 64ish mph and the rpms 1900.
  10. R

    I've had my obs 1999 GMC C2500 suburban with l29 454 vortec 3.73 gears for 6 years, stock 245/75/16 tires the speedo read to high this is from ecm

    Sry I had a picture that I took of the cluster at the same time I thought I still had
  11. R

    I've had my obs 1999 GMC C2500 suburban with l29 454 vortec 3.73 gears for 6 years, stock 245/75/16 tires the speedo read to high this is from ecm

    The instrument speedometer runs at 64ish and rpms run at 1900rpms
  12. R

    I've had my obs 1999 GMC C2500 suburban with l29 454 vortec 3.73 gears for 6 years, stock 245/75/16 tires the speedo read to high this is from ecm

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