RPM question

[JYB018]

Would anyone with a similar setup to what I have chime in and tell me how many RPM's your turning at 70 mph, and what gears you have.

Should there be a tag on the rear end(not one on mind), trying to figure out if someone changed the gears.

Thanks in advance

[jamstoyz]

im runnin 38's and at 70 im runnin around 1750 rpms. now my speedo says 60mph but my gps tells me im at 70. this is with 3.73 gears. not sure but you probably have same gears.

[PSDfan99]

I have 35's and 3.73 gears. When I'm at 70 MPH the tach is at 2,000 RPM's exactly

[JYB018]

I ment to put this too! I think my speedo is off 8 mph and at 62 I'm running 2200 RPM's. Seemed kinda high to me, but not sure?

[jamstoyz]

wow that does sound high. maybe you have 4.30 gears.

[PSDfan99]

Oh another thing, I often drive by those police speed trap radar signs and the police sign says the exact speed that my speedo says, my speedometer is exactly correct.

[sirnunya]

it is is off by 8mph and you're going 70 at 2200rpms, i'd guess you have 4.56 or 4.88 gears. thats what these calculators are telling me

[JYB018]

Thanks for the help! When I was looking for a tag on the rear end I noticed a small leak, so it looks like I'll be finding out whats in there the hard way.

[sldghamr]

4spd auto with 4.10's. 65mph at 2000 rpm

[slammedSI]

I'm running at 80mph right now. and im turning 2300 qith 3.73