Just realized today,that I got the wrong gear when I put my 3.73's in.
Got the 23 tooth for 4.10's instead of 21 tooth.How far is my speedo off and which way?
It is slow, but by how much I'm not sure. Probably 5-8 MPH or so. I have 3.73 and a 7 tooth T5 with the 21 tooth gear, and right at about 60MPH my tach is right around 2000 in 5th. My speedo is actually about 4 MPH fast according to radar and my wife's vehicle (speedo reads 60, radar reads 56). Just be careful about exceeding the speed limit!
Just realized today,that I got the wrong gear when I put my 3.73's in.
Got the 23 tooth for 4.10's instead of 21 tooth.How far is my speedo off and which way?
Your speedo is going to be about 8% to 9% slow (reading about 46 mph at an actual speed of 50 mph). Your tire size will also have some effect on how much your speedo is actually off.