the gears from an 8.8 will not fit in your stock v6's 7.5 rear end. but you can transfer a complete 8.8 rear end into your v6 and ditch the stock complete 7.5 rear end.
On another note the axles are the same also, but some years are different in length but will still work, so if you buy an 8.8 from a pre 99 model your wheels wont stick out enough or if you have a pre 99 with a 99 up 8.8 the wheels will stick out farther.
__________________ 2003 Cobra Vert (Redfire) #3938 of 5082 @ 05/27/2003
472rwhp/493rwtq -Modification List - Dyno Sheet 2012 Mustang 3.7L M6 (Kona Blue) 2011 Ford Edge Sport (Red Metallic)