3.55 gears vs rpms
 

i'm think about putting 3.55 gears in my mustang and i was woundering in 5 spd where are the rpms at 70 mph it will be helpfull and if anybody know with 3.73 please let me know .thank you

Re: 3.55 gears vs rpms
 

well, first off i would say go w/ the 3.73's in the T5!!!!

as far as rpm's, 3.73 vs. stock 2.73 is basically like losing a gear. 5th will feel and have similiar rpm's to stock 4th, 4th will feel like 3rd, and so on. 1st gear is the most fun

Re: 3.55 gears vs rpms
 

A lil over 3000 rpm at 70 mph if I remember back correctly... it's been a few years since I had a five speed with 3.55's... go ahead with the 3.73- not much difference

Re: 3.55 gears vs rpms
 

Drove cross country with 3.73 gears in 5th, with the cruise control set and never turned more than 2600-2700rpm at 75mph, and this is with tires that are too short 2255015, with a 60 series tire it would be around 2400-2600. I also got 24mpg too using the cruise control.

Re: 3.55 gears vs rpms
 

Oh that reminds me... I also had a world class tranny in it... if that makes up the difference in any way on my reply... then again I'd listen to 90GT398 since he has them now.

Re: 3.55 gears vs rpms
 

Re: 3.55 gears vs rpms
 

Excellent graph's Jeff.

Re: 3.55 gears vs rpms
 

On that note here's the one I like to use:

http://www.4x4cyberstore.com/website/rpmchart.html

I am the most gas milage/rpm oriented mustang out there and I thought 3.73's were too little still. 4.10's if not 3.73's. I think you will be unfortunatley disappointed if you go to 3.55's. I got 25 mpg with 3.73's and nonstop 1 week long highway vacation touring.

The 2000 rpms with 2.73's is a different 2000 rpms with 3.73's because of engine load. The motor doesnt have to work as hard to turn the wheels over because of torque multiplication.

I get 18 mpg with an AOD and 4.56's now and a 3k stall. It wont make that much of a difference dude. I cruise at 3100 rpms in OD at 80 mph and I can keep it up for hours.

Good luck!

Re: 3.55 gears vs rpms
 

You could use this sites analyzer too. It is set up for the t-5's gear ratios. Yeah, and I am with pete on this one. 3.73's would be the bare minimum gear. I have 4.10's and love it. Drive your car on the highway in 4th gear, that would simulate the 3.73-4.10 gear. There is just a little bit of difference between the two. If I had an AOD car, I would probably have the 4.56's as well.

Re: 3.55 gears vs rpms
 

Wow I to was thinking about the 3.55s to but after reading this thread I may try to find some 3.73s for my AOD. :)