Asked in Late Model 1979-New Ford Mustangs
What is the rear end gear ratio on 1990 ford mustang gt?
Open the drivers door and look for an information sticker on the end of the door
that shows the axle code
" M " is the 2.73 Traction Lok ( most likely with the automatic )
" Z " is the 3.08 " " ( most likely with the manual transmission )
( also " E " was a 3.27 Traction Lok and " K " was a 3.55 Traction Lok )