How fast am i going!!!!

Hey all i got my 4.10 gears in today what a pain ofcourse for me had to mod some things but she is going.
But the thing is i'm not sure what to expect...
So i'm still feeling it out,But it seems like the speedo is off.
Do i need to get a different gear for the speedo???
I know there was posts awhile back where someone new the speeds or close so i'm looking for a problem solver. Lets do third gear at about 3,000 rpms speedo says 45.
Thanks!!!!
 
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