ToplessPony94

I've been doing a lot of mods to my 94 GT vert, but haven't paid much attention to the rear end until now. I just picked the axle code off the V.C. label in the door jamb and looked it up in the 94 Mustang service manual. The code is "M", which the manual says means Traction Lok with a ratio of 2.73:1. Does that sound right? 2.73 seems low to me. Is stock really that low?

I'm trying to go for a bit of an upgrade back there, but I'm not looking to get 10 mpg. I want to be able to afford to drive it! Even with all of my mods, I get 21 mpg today and it's pretty fast. Is the service manual correct on the ratio I have today? Any suggestions on a new ratio?

Thanks in Advance

PX429

Yeah you have a Deluxe mustang. The premiums came with 3.08 or 3.27's

sultan68

my 88 lx has 2.73's if you put more gear into it i doubt you'll lower it to 10 mpg if you're getting 21 now..you'll mostly just notice a difference on the highway

PX429

are you auto or 5spd

ToplessPony94

Of course, I do almost all of my driving on Mass. Rt. 3 at about 75... I was thinking 3.55 or 3.73 and hope to stay at about 14-15 mpg.

ToplessPony94

Mine is a 5 speed (T5).

PX429

why are you under the impression that gears will give you horrible gas milage?

samseed101

In that case get 3.73s. You'll still have decent mileage and you'll definately notice a nice improvement in acceleration.

ToplessPony94

Well it seems to me that if I get fewer tire rotations per engine rotation that means that when I burn the same amount of gas that I don't go as far. So to go the same distance I burn more gas. Perhaps I'm making a bad assumption somewhere, but I did the following math:

(21 mpg) x (2.73 / 3.55) = 16.15 mpg

(21 mpg) x (2.73 / 3.73) = 15.37 mpg

(21 mpg) x (2.73 / 4.10) = 14 mpg

PX429

You do know RPM's is what determins your gas milage right? not MPG/gear ratio or what ever you did.