diff ratio - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars

xw351 · 05-09-2005, 22:52

Afternoon all
Just a question about diff ratios.

Car is a stock 1969 XW 351windsor auto. Diff ratio at the moment is 3.25.

If you change the diff ratio to say a 3.5 or even 3.7 you obviously get better take off. My question is do you also get a better 1/4mile time or does the car rev out before the finish line and thus risk an even worse time???

thanks
Sam

fat071 · 05-09-2005, 22:58

all depends what you want. do you want a faster take off? or a quicker e.t? myself i would start at the motor and box first then the diff.

05-10-2005, 04:20

turbocharge it and you will love your 3.25's

crzyxf · 05-10-2005, 05:41

No pretty sure you wont rev out the car b4 the finish line. A friend of mine put 3.9s on his XW and got heaps better 60ft time (but that was with a 3 grand stall!!)