Help Needed 3:55 gears and 3 in. down pipe into 4 in.

[big bear]

i posted a ? in the wrong place and i got chatized for it ha! i'll try to do better. i was wondering if going to 3"55 gears would help with the mpg. i read somewhere in one of my deisel mag's where an ole boy stated he got better milage and a wee bit more torque with a 3 in down pipe into 4 in. ,? just wondering if anbody had any infor or experience with this. any help would be appreciated. have a 2001 f-350, 7.3. thanks for every thing

 

[95_stroker]

You have an 01 one ton, is it 4:10's or 3:73's? If it is 4:10's you will notice quite a difference going to 3:55's but you will (might) also lose some towing capacity which will show up as increased EGT's.

 

[BJS]

95 stroker answered the question about the gearing.

There are some benefits in terms of power by installing an exhaust but not a tremendous amount you will gain some. Your mileage will take quite awhile to make apayback for an exhaust system if that's your only motivating reason. If you want a bit more on the seat of the pants dyno and a different sound then an exhaust is in order for you and the mpg benefits are secondary.

 

[big bear]

3 inm. down pipe into 4 in. and going to 3:55's

You have an 01 one ton, is it 4:10's or 3:73's? If it is 4:10's you will notice quite a difference going to 3:55's but you will (might) also lose some towing capacity which will show up as increased EGT's.

hey 95 stroker thanks for coming back to me. no i have 3:73's in it now but was thinking about going 2 3:55's just for the drop in rpm's and maybe an increase in mpg. i I've read somewhere in one my deisel mag's that another owner kept his 3 in. dp into 4 in. and he says he got another 2 mpg and a little more torque. i was wondering if i should consider this or 4get it or keep my 4 in from the turbo all the way back. just got my 203 stat., aih and my fomoto valve which i'll start on inst. in the a and m.: than i'm going to to do the bama zoodad mod. i'll let u know how all this turns out trhanks for everything