For those of you that have changed the gearing, what is the lowest gear the stock carrier will allow? I am interested in adding 4.56 both front and rear.

Thanks

 

4.88 if I remember when I was looking at them ... due to rev 8.8 front diff ... that is based on what I found available ... not what could potentially fit! ... I think the normal 8.8 went way up to the 6.? something!
My Gear Chart

 

Thanks 64F10, did you install new gearing in your truck and if so what gear was it? I am looking for better pulling power and I think the 4.56 is what I am after. I know the tuner would be better for the money but I'm not just ready to mess with that yet.

Thanks

 

I did not put my own gears in ... had a local shop do it! You'll need some sort of tune with 4.56 gears ... unless you've 35" or taller tire because from what I hear Ford's PCM machine won't do it for lower gear combos! ... ya, seems crazy to me! But they could only get me to about 12% with my 33"'s. Had to get a tuner to dial things back in ...