Correct Ring and Pinion Ratio to T3, Sorry I Mean T4 3.7 V6 Stang
#38041 from David Mead · Rule change · TB 25-05 (2025-05 Fastrack)
In T4 Spec Lines, Ford Mustang V6 (05-14), add to Notes the following:
"GT 8.8 rear axle assembly allowed. 3.45 or 3.55 final drive ratio allowed. 7.5 rear axle assembly with 3.45:1 final drive allowed."