rear gear question!

[DFG_magic]

If I run right at 1900rpm in 5th at 60mph and 2000-2100rpm at 70mph in 5th gear, what rear end do I most likely have? Stock 3.27's? What are some of your 5th gear 60 and 70mph RPM's with stock/aftermarket rear ends? Thanks for the help. Just trying to figure out if the previous owner changed the rear end or not without breaking down the rear.

 

[quickstang_1994]

do a search for a rear gear calculator and check your 4 th gear because its 1:1.

 

[gt96stang]

Jack the end of the stang up... Count the number of times the driveshaft turns per 1 revolution of the tire and there you have your rear end gear.

 

[DFG_magic]

Thanks guys! Found this as well for anyone else curious. VERY nice tool!

http://www.corral.net/tech/gearcalc.html